303 area code
The 303 area code is associated with the state of Colorado in the United States, particularly covering the Denver metropolitan area and surrounding regions. This area code serves as a geographic identifier within the North American Numbering Plan (NANP) for telephone numbering purposes in the designated Colorado locations.
| State | colorado |
| Major City | Denver |
| Timezone | Mountain Time Zone (MT) |
What time zone is area code 303?
The 303 area code is located in the Mountain Time Zone (MT) in the United States. This time zone is seven hours behind Coordinated Universal Time (UTC-7:00). The Mountain Time Zone encompasses a significant portion of the western United States and includes states such as Colorado, Montana, Wyoming, and parts of New Mexico and Arizona. Therefore, if you are making or receiving calls within the 303 area code, you can generally expect the time zone to be Mountain Time.
Note that the start and end dates of daylight saving time can change
History
The 303 area code was established in 1947, covering the entire state of Colorado. In response to increasing demand, the 720 area code was introduced in 1998 through an overlay, allowing for additional number assignments without geographical restrictions. This overlay approach aimed to accommodate the growing telecommunications needs of the Denver metropolitan area and surrounding regions, ensuring the continued availability of telephone numbers while preserving existing 303 numbers. As a result, both the 303 and 720 area codes coexist, playing a crucial role in serving Colorado's diverse and expanding population.
Nearby Areacodes of 303
This table provides a quick overview of all area codes, their locations, and some historical context for each.
| Area Code | Location | History and Details |
|---|---|---|
| 303 | Denver, CO | Established in 1947, the 303 area code covers the entire state of Colorado. It primarily serves the Denver metropolitan area and its surroundings. In 1998, the 720 overlay was introduced to meet increasing demand while preserving existing numbers. |
| 720 | Denver, CO | Introduced in 1998 as an overlay for the 303 area code, the 720 area code accommodates additional number assignments without geographical restrictions. It overlaps with the 303 area, serving the same regions in and around Denver. |
| 983 | Denver, CO | The 983 area code was introduced in the overlay complex for Denver, Colorado. Specific details about its history may vary. It overlaps with the 303 and 720 area codes, serving the same regions in and around Denver. |
| 308 | Grand Island, NE | Established in the initial North American Numbering Plan in 1947, the 308 area code serves Grand Island, Nebraska. |
| 505 | Albuquerque, NM | Details about the history and specifics of the 505 area code in Albuquerque, New Mexico. |
| 575 | Las Cruces, NM | Details about the history and specifics of the 575 area code in Las Cruces, New Mexico. |
| 580 | Lawton, OK | Details about the history and specifics of the 580 area code in Lawton, Oklahoma. |
| 719 | Colorado Springs, CO | Details about the history and specifics of the 719 area code in Colorado Springs, Colorado. |
| 970 | Fort Collins, CO | Details about the history and specifics of the 970 area code in Fort Collins, Colorado. |
Counties in Area Code 303
Area code 303 covers a total of 12 counties in the state of Colorado. These counties include a diverse range of landscapes and communities, from the eastern plains to the western mountains.
| County | Total Population | % of 303 | % of County |
|---|---|---|---|
| Denver, CO | 600,158 | 2% | 100% |
| Arapahoe, CO | 572,003 | 12% | 100% |
| Jefferson, CO | 534,543 | 11% | 100% |
| Adams, CO | 441,603 | 17% | 100% |
| Boulder, CO | 294,567 | 11% | 100% |
| Douglas, CO | 285,465 | 12% | 99% |
| Broomfield, CO | 55,889 | 0% | 100% |
| Weld, CO | 252,825 | 11% | 19% |
| Elbert, CO | 23,086 | 10% | 37% |
| Clear Creek, CO | 9,088 | 5% | 93% |
| Gilpin, CO | 5,441 | 2% | 100% |
| Park, CO | 16,206 | 5% | 16% |
Cities in Area Code 303
Here are the some of the major cities and towns in Michigan covered by area code 303 include Cheyenne, Casper, Laramie, Gillette, Rock Springs, Sheridan, Jackson, Cody, and Evanston, among others. There are many more smaller towns and communities within this area code as well.
| County | Total Population | % of 303 | % of County |
|---|---|---|---|
| Denver, CO | 600,158 | 2% | 100% |
| Aurora, CO | 325,078 | 2% | 100% |
| Lakewood, CO | 142,980 | 1% | 100% |
| Thornton, CO | 118,772 | 1% | 100% |
| Arvada, CO | 106,433 | 1% | 100% |
| Westminster, CO | 106,114 | 0% | 100% |
| Centennial, CO | 100,377 | 0% | 100% |
| Boulder, CO | 97,385 | 0% | 100% |
| Highlands Ranch, CO | 96,713 | 0% | 100% |
| Longmont, CO | 86,270 | 0% | 100% |
| Broomfield, CO | 55,889 | 0% | 100% |
| Castle Rock, CO | 48,231 | 0% | 100% |
| Commerce City, CO | 45,913 | 1% | 100% |
| Parker, CO | 45,297 | 0% | 100% |
| Littleton, CO | 41,737 | 0% | 100% |
| Northglenn, CO | 35,789 | 0% | 100% |
| Brighton, CO | 33,352 | 0% | 100% |
| Ken Caryl, CO | 32,438 | 0% | 100% |
| Dakota Ridge, CO | 32,005 | 0% | 100% |
| Englewood, CO | 30,255 | 0% | 100% |
| Evergreen, CO | 9,038 | 0% | 100% |
| Stonegate, CO | 8,962 | 0% | 100% |
| Frederick, CO | 8,679 | 0% | 100% |
| Derby, CO | 7,685 | 0% | 100% |
| Fairmount, CO | 7,559 | 0% | 100% |
| Fort Lupton, CO | 7,377 | 0% | 100% |
| Applewood, CO | 7,160 | 0% | 100% |
| Twin Lakes, CO | 6,101 | 0% | 100% |
| Cherry Hills Village, CO | 5,987 | 0% | 100% |
| Sheridan, CO | 5,664 | 0% | 100% |
| Dove Valley, CO | 5,243 | 0% | 100% |
Largest telephone carriers in area code 303
This table provides a quick overview of nearby area codes, their locations, and some historical context for each.
| Carrier | Landline Market Share | Wireless Market Share |
|---|---|---|
| Qwest Corporation | 57% | - |
| Icg Telecom Group | 4% | - |
| Teleport America | 3% | - |
| Mcimetro Access Transmission Services | 3% | - |
| Global Crossing Local Services | 2% | - |
| Level 3 | 2% | - |
| Comcast Phone | 1% | - |
| Other | 5% | - |
| Verizon Wireless | - | 7% |
| USA Mobility Wireless | - | 4% |
| Cingular | - | 4% |
| Sprint | - | 4% |
| T-Mobile | - | 1% |
| American Messaging (AM) | - | 1% |
| Contact Paging | - | 1% |
| Other | - | 1% |
Prefixes in Area Code 301
Below is the list of some of Prefixes in area code 301
| Prefix | Usage | Primary City | Carrier | Introduction Date |
|---|---|---|---|---|
| (303) 200- | landline | Denver | Teleport Comms America | 01/25/1998 |
| (303) 201- | wireless | Denver | USA Mobility Wireless | 09/11/1994 |
| (303) 202- | landline | Denver | Qwest Corp. | 09/11/1994 |
| (303) 203- | wireless | Denver | American Messaging (am) | 01/25/1998 |
| (303) 204- | wireless | Denver | Verizon Wireless | 04/01/1997 |
| (303) 205- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 206- | wireless | Denver | USA Mobility Wireless | 04/15/1996 |
| (303) 207- | wireless | Denver | USA Mobility Wireless | 01/10/1996 |
| (303) 208- | wireless | Denver | USA Mobility Wireless | 02/11/1995 |
| (303) 209- | landline | Denver | MCI Metro ATS | 10/31/2001 |
| (303) 210- | wireless | Denver | Sprint | 04/01/1997 |
| (303) 212- | wireless | Denver | Contact Paging | 02/11/1995 |
| (303) 213- | wireless | Denver | USA Mobility Wireless | 04/15/1996 |
| (303) 214- | landline | Aurora | MCI Metro ATS | 01/11/1997 |
| (303) 215- | landline | Golden | Qwest Corp. | 04/15/1996 |
| (303) 216- | landline | Golden | Qwest Corp. | 10/15/1996 |
| (303) 217- | landline | Denver | MCI Metro ATS | 01/11/1997 |
| (303) 218- | landline | Denver | MCI Metro ATS | 01/11/1997 |
| (303) 219- | landline | Brighton | MCI Metro ATS | 04/01/1997 |
| (303) 220- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 221- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 222- | landline | Denver | MCI Metro ATS | 01/11/1997 |
| (303) 223- | landline | Denver | Global Crossing Local Services | 01/25/1998 |
| (303) 224- | landline | Denver | Qwest Corp. | 01/25/1998 |
| (303) 225- | landline | Denver | Global Crossing Local Services | 01/25/1998 |
| (303) 226- | landline | Denver | Icg Telecom Group | 01/25/1998 |
| (303) 227- | landline | Denver | Qwest Corp. | 10/15/1996 |
| (303) 228- | landline | Denver | Icg Telecom Group | 01/25/1998 |
| (303) 229- | wireless | Denver | Verizon Wireless | 01/11/1997 |
| (303) 230- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 231- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 232- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 233- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 234- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 235- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 236- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 237- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 238- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 239- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 240- | wireless | Denver | USA Mobility Wireless | 04/01/1997 |
| (303) 241- | wireless | Denver | Verizon Wireless | 01/11/1997 |
| (303) 242- | landline | Denver | MCI Metro ATS | 04/01/1997 |
| (303) 243- | wireless | Denver | N.e. Colorado Cellular | 04/01/1997 |
| (303) 244- | landline | Denver | Qwest Corp. | 01/25/1998 |
| (303) 245- | landline | Denver | Qwest Corp. | 01/25/1998 |
| (303) 246- | wireless | Denver | Sprint | 04/01/1997 |
| (303) 247- | landline | Denver | Qwest Corp. | 01/25/1998 |
| (303) 248- | landline | Denver | Teleport Comms America | 04/01/1997 |
| (303) 249- | wireless | Denver | Cingular Wireless | 04/01/1997 |
| (303) 250- | wireless | Denver | Cingular Wireless | 04/01/1997 |
| (303) 251- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 252- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 253- | landline | Denver | Teleport Comms America | 04/01/1997 |
| (303) 254- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 255- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 256- | landline | Denver | Teleport Comms America | 04/01/1997 |
| (303) 257- | wireless | Denver | Sprint | 01/25/1998 |
| (303) 258- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 259- | wireless | Denver | American Messaging (am) | 10/11/1997 |
| (303) 260- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 261- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 262- | landline | Denver | AT&T; Local | 02/27/1999 |
| (303) 263- | wireless | Denver | Verizon Wireless | 09/11/1994 |
| (303) 264- | landline | Denver | Teleport Comms America | 04/01/1997 |
| (303) 265- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 266- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 267- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 268- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 269- | landline | Denver | Qwest Corp. | 06/30/2001 |
| (303) 270- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 271- | landline | Golden | Qwest Corp. | 02/04/1994 |
| (303) 272- | landline | Denver | Qwest Corp. | 01/25/1998 |
| (303) 273- | landline | Golden | Qwest Corp. | 02/04/1994 |
| (303) 274- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 275- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 276- | landline | Denver | Convergent Comms | 04/01/1997 |
| (303) 277- | landline | Golden | Qwest Corp. | 02/04/1994 |
| (303) 278- | landline | Golden | Qwest Corp. | 02/04/1994 |
| (303) 279- | landline | Golden | Qwest Corp. | 02/04/1994 |
| (303) 280- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 281- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 282- | landline | Denver | Qwest Corp. | 01/25/1998 |
| (303) 283- | landline | Aurora | Qwest Corp. | 04/01/1997 |
| (303) 284- | landline | Denver | Comcast Phone | 10/13/1999 |
| (303) 285- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 286- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 287- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 288- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 289- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 290- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 291- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 292- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 293- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 294- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 295- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 296- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 297- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 298- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 299- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 300- | landline | Denver | Qwest Corp. | 11/20/1998 |
| (303) 301- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 302- | landline | Denver | Xo Colorado | 11/20/1998 |
| (303) 304- | wireless | Fort Lupton | Cingular Wireless | 11/18/2004 |
| (303) 305- | landline | Denver | MCI Metro ATS | 01/11/1997 |
| (303) 306- | landline | Aurora | Qwest Corp. | 04/15/1996 |
| (303) 307- | landline | Denver | Qwest Corp. | 05/18/1998 |
| (303) 308- | landline | Denver | Qwest Corp. | 08/14/1998 |
| (303) 309- | landline | Denver | Global Crossing Local Services | 01/25/1998 |
| (303) 310- | wireless | Denver | Contact Paging | 09/11/1994 |
| (303) 312- | landline | Denver | Qwest Corp. | 02/11/1995 |
| (303) 313- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 314- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 315- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 316- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 317- | landline | Aurora | Qwest Corp. | 09/11/1994 |
| (303) 318- | landline | Denver | Qwest Corp. | 01/11/1997 |
| (303) 319- | wireless | Denver | Elbert County Wireless | 08/12/2004 |
| (303) 320- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 321- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 322- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 323- | landline | Denver | MCI Metro ATS | 04/01/1997 |
| (303) 324- | wireless | Denver | Cingular Wireless | 02/04/1994 |
| (303) 325- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 326- | landline | Aurora | Qwest Corp. | 01/11/1997 |
| (303) 327- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 328- | landline | Denver | MCI Metro ATS | 01/11/1997 |
| (303) 329- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 330- | landline | Denver | 360networks (usa) | 03/09/2006 |
| (303) 331- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 332- | wireless | Denver | T-mobile USA | 10/15/1996 |
| (303) 333- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 334- | landline | Denver | MCI Metro ATS | 04/01/1997 |
| (303) 335- | landline | Denver | Verizon Wireless | 11/20/1998 |
| (303) 336- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 337- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 338- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 339- | landline | Denver | Cbeyond Comms | 12/15/2003 |
| (303) 340- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 341- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 342- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 343- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 344- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 345- | landline | Denver | Icg Telecom Group | 01/25/1998 |
| (303) 346- | landline | Littleton | Qwest Corp. | 01/25/1998 |
| (303) 347- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 348- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 349- | wireless | Denver | Verizon Wireless | 10/15/1996 |
| (303) 350- | landline | Denver | Cingular Wireless | 10/13/1999 |
| (303) 351- | landline | Keenesburg | 360networks (usa) | 11/08/2006 |
| (303) 352- | landline | Denver | Qwest Corp. | 01/25/1998 |
| (303) 353- | landline | Denver | Comcast Phone | 10/13/1999 |
| (303) 354- | landline | Denver | Teleport Comms America | 01/25/1998 |
| (303) 355- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 356- | wireless | Denver | Sprint | 01/25/1998 |
| (303) 357- | landline | Denver | MCI Metro ATS | 01/25/1998 |
| (303) 358- | wireless | Denver | Verizon Wireless | 04/01/1997 |
| (303) 359- | wireless | Denver | T-mobile USA | 10/15/1996 |
| (303) 360- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 361- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 362- | landline | Denver | Teleport Comms America | 10/15/1996 |
| (303) 363- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 364- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 365- | landline | Aurora | Qwest Corp. | 07/01/1996 |
| (303) 366- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 367- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 368- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 369- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 370- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 371- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 372- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 373- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 374- | landline | Denver | Teleport Comms America | 04/01/1997 |
| (303) 375- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 376- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 377- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 378- | wireless | Denver | Cingular Wireless | 02/04/1994 |
| (303) 379- | landline | Denver | Teleport Comms America | 04/01/1997 |
| (303) 380- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 381- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 382- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 383- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 384- | landline | Golden | Qwest Corp. | 02/04/1994 |
| (303) 385- | landline | Denver | Icg Telecom Group | 01/25/1998 |
| (303) 386- | landline | Denver | Icg Telecom Group | 01/25/1998 |
| (303) 387- | landline | Denver | Mcleodusa Telecom Services | 04/01/1997 |
| (303) 388- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 389- | landline | Denver | Qwest Corp. | 10/15/1996 |
| (303) 390- | landline | Denver | MCI Metro ATS | 01/11/1997 |
| (303) 391- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 392- | wireless | Denver | Contact Paging | 02/04/1994 |
| (303) 393- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 394- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 395- | landline | Denver | Global Crossing Local Services | 01/25/1998 |
| (303) 396- | landline | Denver | Live Wire Networks | 06/01/2005 |
| (303) 397- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 398- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 399- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 400- | landline | Denver | Qwest Corp. | 11/20/1998 |
| (303) 401- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 402- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 403- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 404- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 405- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 406- | landline | Denver | Icg Telecom Group | 07/06/1997 |
| (303) 407- | landline | Denver | Cbeyond Comms | 05/18/1998 |
| (303) 408- | landline | Denver | Cingular Wireless | 04/01/1997 |
| (303) 409- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 410- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 412- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 413- | landline | Denver | Qwest Corp. | 07/04/1995 |
| (303) 414- | landline | Denver | Icg Telecom Group | 02/11/1995 |
| (303) 415- | landline | Denver | Qwest Corp. | 02/11/1995 |
| (303) 416- | landline | Denver | Global Crossing Local Services | 01/25/1998 |
| (303) 417- | landline | Denver | Qwest Corp. | 07/04/1995 |
| (303) 418- | landline | Aurora | Icg Telecom Group | 04/01/1997 |
| (303) 419- | wireless | Denver | Sprint | 09/11/1994 |
| (303) 420- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 421- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 422- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 423- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 424- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 425- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 426- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 427- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 428- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 429- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 430- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 431- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 432- | landline | Denver | Qwest Corp. | 10/15/1996 |
| (303) 433- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 434- | wireless | Denver | Sprint | 01/25/1998 |
| (303) 435- | wireless | Denver | Sprint | 04/01/1997 |
| (303) 436- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 437- | wireless | Denver | Sprint | 10/15/1996 |
| (303) 438- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 439- | landline | Denver | Qwest Corp. | 09/11/1994 |
| (303) 440- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 441- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 442- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 443- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 444- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 445- | landline | Denver | Qwest Corp. | 07/01/1996 |
| (303) 446- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 447- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 448- | landline | Denver | Qwest Corp. | 07/01/1996 |
| (303) 449- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 450- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 451- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 452- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 453- | landline | Denver | Qwest Corp. | 01/25/1998 |
| (303) 454- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 455- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 456- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 457- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 458- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 459- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 460- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 461- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 462- | landline | Denver | Qwest Corp. | 09/11/1994 |
| (303) 463- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 464- | landline | Denver | Qwest Corp. | 10/15/1996 |
| (303) 465- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 466- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 467- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 468- | landline | Denver | Cbeyond Comms | 05/24/2001 |
| (303) 469- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 470- | landline | Littleton | Qwest Corp. | 02/04/1994 |
| (303) 471- | landline | Littleton | Qwest Corp. | 01/11/1997 |
| (303) 472- | wireless | Denver | Sprint | 09/11/1994 |
| (303) 473- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 474- | landline | Denver | Teleport Comms America | 04/01/1997 |
| (303) 475- | wireless | Denver | Cingular Wireless | 02/04/1994 |
| (303) 476- | landline | Denver | MCI Metro ATS | 01/25/1998 |
| (303) 477- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 478- | wireless | Denver | Cingular Wireless | 02/04/1994 |
| (303) 479- | landline | Brighton | Teleport Comms America | 01/25/1998 |
| (303) 480- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 481- | landline | Denver | MCI Metro ATS | 01/11/1997 |
| (303) 482- | landline | Denver | Global Crossing Local Services | 01/25/1998 |
| (303) 483- | landline | Denver | Icg Telecom Group | 01/25/1998 |
| (303) 484- | landline | Denver | Teleport Comms America | 01/25/1998 |
| (303) 485- | landline | Longmont | Qwest Corp. | 01/25/1998 |
| (303) 486- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 487- | landline | Denver | Qwest Corp. | 10/11/1997 |
| (303) 488- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 489- | wireless | Denver | Verizon Wireless | 02/04/1994 |
| (303) 490- | wireless | Denver | USA Mobility Wireless | 04/01/1997 |
| (303) 491- | wireless | Denver | USA Mobility Wireless | 04/01/1997 |
| (303) 492- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 493- | landline | Denver | Icg Telecom Group | 01/25/1998 |
| (303) 494- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 495- | landline | Denver | MCI Metro ATS | 01/25/1998 |
| (303) 496- | landline | Denver | Xo Colorado | 04/08/2004 |
| (303) 497- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 498- | landline | Brighton | Comcast Phone | 04/22/2005 |
| (303) 499- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 500- | landline | Hudson | Level 3 Comms | 01/04/2005 |
| (303) 501- | landline | Denver | Verizon Wireless | 01/26/2006 |
| (303) 502- | wireless | Fort Lupton | Verizon Wireless | 12/13/2005 |
| (303) 503- | wireless | Denver | Verizon Wireless | 04/15/1996 |
| (303) 504- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 505- | wireless | Denver | Sprint | 11/09/2012 |
| (303) 506- | wireless | Fort Lupton | Cingular Wireless | 09/13/2001 |
| (303) 507- | wireless | Denver | Sprint | 04/15/1996 |
| (303) 508- | wireless | Denver | American Messaging (am) | 01/10/1996 |
| (303) 509- | wireless | Denver | American Messaging (am) | 01/10/1996 |
| (303) 510- | wireless | Denver | American Messaging (am) | 07/01/1996 |
| (303) 512- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 513- | wireless | Denver | Cingular Wireless | 02/15/2002 |
| (303) 514- | wireless | Denver | Verizon Wireless | 04/15/1996 |
| (303) 515- | landline | Denver | 360networks (usa) | 11/14/2011 |
| (303) 516- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 517- | wireless | Denver | Cingular Wireless | 07/04/1995 |
| (303) 518- | wireless | Denver | Verizon Wireless | 09/11/1994 |
| (303) 519- | wireless | Denver | Verizon Wireless | 09/11/1994 |
| (303) 520- | wireless | Denver | Sprint | 10/15/1996 |
| (303) 521- | wireless | Denver | Sprint | 10/15/1996 |
| (303) 522- | wireless | Denver | Sprint | 04/01/1997 |
| (303) 523- | wireless | Denver | T-mobile USA | 10/15/1996 |
| (303) 524- | landline | Denver | Teleport Comms America | 04/01/1997 |
| (303) 525- | wireless | Denver | Sprint | 11/20/1998 |
| (303) 526- | landline | Golden | Qwest Corp. | 02/04/1994 |
| (303) 527- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 528- | wireless | Denver | American Messaging (am) | 02/04/1994 |
| (303) 529- | wireless | Denver | USA Mobility Wireless | 07/01/1996 |
| (303) 530- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 531- | landline | Denver | MCI Metro ATS | 01/11/1997 |
| (303) 532- | landline | Longmont | Mcleodusa Telecom Services | 10/13/1999 |
| (303) 533- | landline | Denver | Qwest Corp. | 01/11/1997 |
| (303) 534- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 535- | landline | Fort Lupton | Cbeyond Comms | 10/31/2001 |
| (303) 536- | landline | Hudson | Qwest Corp. | 02/04/1994 |
| (303) 537- | landline | Aurora | Teleport Comms America | 01/11/1997 |
| (303) 538- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 539- | landline | Denver | Xo Colorado | 11/20/1998 |
| (303) 540- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 541- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 542- | landline | Denver | MCI Metro ATS | 04/01/1997 |
| (303) 543- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 544- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 545- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 546- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 547- | landline | Denver | Global Crossing Local Services | 01/25/1998 |
| (303) 548- | wireless | Denver | Verizon Wireless | 02/04/1994 |
| (303) 549- | wireless | Denver | Verizon Wireless | 07/01/1996 |
| (303) 550- | wireless | Denver | Verizon Wireless | 02/04/1994 |
| (303) 551- | landline | Louisville | MCI Metro ATS | 02/04/1994 |
| (303) 552- | landline | Denver | Global Crossing Local Services | 08/14/1998 |
| (303) 553- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 554- | landline | Denver | Qwest Corp. | 10/15/1996 |
| (303) 556- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 557- | landline | Aurora | Global Crossing Local Services | 08/14/1998 |
| (303) 558- | landline | Brighton | Global Crossing Local Services | 08/14/1998 |
| (303) 559- | wireless | Denver | American Messaging (am) | 11/20/1998 |
| (303) 560- | wireless | Denver | USA Mobility Wireless | 10/15/1996 |
| (303) 561- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 562- | landline | Denver | Global Crossing Local Services | 01/25/1998 |
| (303) 563- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 564- | wireless | Denver | T-mobile USA | 10/15/1996 |
| (303) 565- | landline | Denver | Cbeyond Comms | 01/11/1997 |
| (303) 566- | landline | Denver | MCI Metro ATS | 04/01/1997 |
| (303) 567- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 568- | landline | Denver | Teleport Comms America | 04/01/1997 |
| (303) 569- | landline | Idaho Springs | Qwest Corp. | 02/04/1994 |
| (303) 570- | wireless | Denver | Cingular Wireless | 02/04/1994 |
| (303) 571- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 572- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 573- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 574- | landline | Denver | Qwest Corp. | 10/15/1996 |
| (303) 575- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 576- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 577- | landline | Aurora | Eschelon Telecom | 06/13/2000 |
| (303) 578- | landline | Keenesburg | Level 3 Comms | 09/12/2006 |
| (303) 579- | wireless | Denver | Verizon Wireless | 07/01/1996 |
| (303) 580- | wireless | Denver | American Messaging (am) | 01/11/1997 |
| (303) 581- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 582- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 583- | landline | Denver | Teleport Comms America | 01/11/1997 |
| (303) 584- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 585- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 586- | landline | Denver | 4dvision | 09/18/2007 |
| (303) 587- | wireless | Denver | Sprint | 10/15/1996 |
| (303) 588- | wireless | Denver | Cingular Wireless | 01/25/1998 |
| (303) 589- | wireless | Denver | Cingular Wireless | 02/04/1994 |
| (303) 590- | landline | Denver | Icg Telecom Group | 07/06/1997 |
| (303) 591- | wireless | Denver | Sprint | 09/11/1994 |
| (303) 592- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 593- | landline | Denver | Teleport Comms America | 01/25/1998 |
| (303) 594- | wireless | Denver | Verizon Wireless | 09/11/1994 |
| (303) 595- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 596- | wireless | Denver | Sprint | 01/11/1997 |
| (303) 597- | landline | Denver | Eschelon Telecom | 06/13/2000 |
| (303) 598- | wireless | Denver | Sprint | 09/11/1994 |
| (303) 599- | wireless | Denver | USA Mobility Wireless | 07/01/1996 |
| (303) 600- | landline | Denver | Teleport Comms America | 02/27/1999 |
| (303) 601- | wireless | Denver | Cingular Wireless | 02/11/1995 |
| (303) 602- | landline | Denver | Qwest Corp. | 07/04/1995 |
| (303) 603- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 604- | landline | Denver | Qwest Corp. | 09/11/1994 |
| (303) 605- | landline | Denver | Qwest Corp. | 07/04/1995 |
| (303) 606- | landline | Denver | Qwest Corp. | 02/11/1995 |
| (303) 607- | landline | Denver | Qwest Corp. | 09/11/1994 |
| (303) 608- | landline | Denver | Qwest Corp. | 02/11/1995 |
| (303) 609- | wireless | Denver | USA Mobility Wireless | 09/11/1994 |
| (303) 610- | wireless | Denver | USA Mobility Wireless | 02/11/1995 |
| (303) 612- | wireless | Denver | USA Mobility Wireless | 07/04/1995 |
| (303) 613- | wireless | Denver | USA Mobility Wireless | 07/04/1995 |
| (303) 614- | landline | Aurora | Qwest Corp. | 02/11/1995 |
| (303) 615- | landline | Denver | Qwest Corp. | 02/11/1995 |
| (303) 616- | wireless | Denver | USA Mobility Wireless | 07/04/1995 |
| (303) 617- | landline | Denver | Qwest Corp. | 07/04/1995 |
| (303) 618- | wireless | Denver | Cingular Wireless | 02/11/1995 |
| (303) 619- | wireless | Denver | Cingular Wireless | 07/01/1996 |
| (303) 620- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 621- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 622- | landline | Strasburg | Strasburg Telco | 02/04/1994 |
| (303) 623- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 624- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 625- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 626- | landline | Denver | Qwest Corp. | 07/01/1996 |
| (303) 627- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 628- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 629- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 630- | landline | Denver | Qwest Corp. | 07/01/1996 |
| (303) 632- | landline | Denver | Teleport Comms America | 01/11/1997 |
| (303) 633- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 634- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 635- | landline | Denver | Qwest Corp. | 01/25/1998 |
| (303) 636- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 637- | landline | Brighton | Qwest Corp. | 02/04/1994 |
| (303) 638- | wireless | Denver | Cingular Wireless | 07/01/1996 |
| (303) 639- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 640- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 641- | wireless | Denver | Sprint | 10/15/1996 |
| (303) 642- | landline | Denver | Qwest Corp. | 10/15/1996 |
| (303) 643- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 644- | landline | Bennett | Eastern Slope Rural Telephone Association | 02/04/1994 |
| (303) 645- | landline | Denver | Qwest Corp. | 07/01/1996 |
| (303) 646- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 647- | landline | Sedalia | Qwest Corp. | 02/04/1994 |
| (303) 648- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 649- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 650- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 651- | landline | Longmont | Qwest Corp. | 02/04/1994 |
| (303) 652- | landline | Longmont | Qwest Corp. | 02/04/1994 |
| (303) 653- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 654- | landline | Brighton | Qwest Corp. | 02/04/1994 |
| (303) 655- | landline | Brighton | Qwest Corp. | 07/01/1996 |
| (303) 656- | wireless | Denver | Big River TelephoneCo. | 02/19/2009 |
| (303) 657- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 658- | wireless | Denver | Qwest Corp. | 09/11/1994 |
| (303) 659- | landline | Brighton | Qwest Corp. | 02/04/1994 |
| (303) 660- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 661- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 662- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 663- | landline | Denver | Qwest Corp. | 01/25/1998 |
| (303) 664- | landline | Denver | Qwest Corp. | 07/01/1996 |
| (303) 665- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 666- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 667- | wireless | Denver | T-mobile USA | 10/15/1996 |
| (303) 668- | wireless | Denver | T-mobile USA | 10/15/1996 |
| (303) 669- | wireless | Denver | T-mobile USA | 10/15/1996 |
| (303) 670- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 671- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 672- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 673- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 674- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 675- | landline | Denver | Qwest Corp. | 07/01/1996 |
| (303) 676- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 677- | landline | Aurora | Qwest Corp. | 10/15/1996 |
| (303) 678- | landline | Longmont | Qwest Corp. | 02/04/1994 |
| (303) 679- | landline | Denver | Qwest Corp. | 01/11/1997 |
| (303) 680- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 681- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 682- | landline | Longmont | Qwest Corp. | 02/04/1994 |
| (303) 683- | landline | Littleton | Qwest Corp. | 02/04/1994 |
| (303) 684- | landline | Longmont | Qwest Corp. | 02/04/1994 |
| (303) 685- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 686- | wireless | Denver | USA Mobility Wireless | 07/01/1996 |
| (303) 687- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 688- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 689- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 690- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 691- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 692- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 693- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 694- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 695- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 696- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 697- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 698- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 699- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 701- | wireless | Denver | Comms Unlimited | 02/11/1995 |
| (303) 702- | landline | Longmont | Qwest Corp. | 07/04/1995 |
| (303) 703- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 704- | landline | Denver | MCI Metro ATS | 01/11/1997 |
| (303) 705- | landline | Denver | Qwest Corp. | 09/11/1994 |
| (303) 706- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 707- | landline | Denver | Qwest Corp. | 02/11/1995 |
| (303) 708- | landline | Denver | Qwest Corp. | 10/15/1996 |
| (303) 709- | wireless | Longmont | Verizon Wireless | 09/11/1994 |
| (303) 710- | wireless | Fort Lupton | Verizon Wireless | 02/11/1995 |
| (303) 712- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 713- | landline | Denver | Qwest Corp. | 07/01/1996 |
| (303) 714- | landline | Denver | Qwest Corp. | 07/04/1995 |
| (303) 715- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 716- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 717- | wireless | Fort Lupton | Cingular Wireless | 02/11/1995 |
| (303) 718- | wireless | Fort Lupton | Verizon Wireless | 02/11/1995 |
| (303) 719- | landline | Deer Trail | Ymax Comms Corp. | 11/16/2006 |
| (303) 720- | wireless | Fort Lupton | Verizon Wireless | 06/13/2008 |
| (303) 721- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 722- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 723- | landline | Denver | Teleport Comms America | 01/11/1997 |
| (303) 724- | landline | Aurora | Qwest Corp. | 04/01/1997 |
| (303) 725- | wireless | Denver | Sprint | 04/01/1997 |
| (303) 726- | wireless | Denver | Verizon Wireless | 01/25/1998 |
| (303) 727- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 728- | landline | Denver | Teleport Comms America | 04/01/1997 |
| (303) 729- | landline | Denver | MCI Metro ATS | 01/11/1997 |
| (303) 730- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 731- | landline | Aurora | Level 3 Comms | 04/01/1997 |
| (303) 732- | landline | Keenesburg | Qwest Corp. | 02/04/1994 |
| (303) 733- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 734- | landline | Denver | Qwest Corp. | 10/15/1996 |
| (303) 735- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 736- | landline | Denver | Teleport Comms America | 01/11/1997 |
| (303) 737- | landline | Denver | Qwest Corp. | 01/25/1998 |
| (303) 738- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 739- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 740- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 741- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 742- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 743- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 744- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 745- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 746- | wireless | Longmont | Verizon Wireless | 07/04/1995 |
| (303) 747- | landline | Allenspark | Qwest Corp. | 02/04/1994 |
| (303) 748- | wireless | Denver | Cingular Wireless | 02/04/1994 |
| (303) 749- | landline | Denver | Teleport Comms America | 01/11/1997 |
| (303) 750- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 751- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 752- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 753- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 754- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 755- | landline | Aurora | Qwest Corp. | 02/04/1994 |
| (303) 756- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 757- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 758- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 759- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 760- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 761- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 762- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 763- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 764- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 765- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 766- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 767- | wireless | Denver | Contact Paging | 02/04/1994 |
| (303) 768- | landline | Denver | Qwest Corp. | 10/15/1996 |
| (303) 769- | landline | Deer Trail | Bijou Telephone Cooperative Association | 02/04/1994 |
| (303) 770- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 771- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 772- | landline | Longmont | Qwest Corp. | 02/04/1994 |
| (303) 773- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 774- | landline | Longmont | Qwest Corp. | 07/01/1996 |
| (303) 775- | wireless | Longmont | Verizon Wireless | 02/04/1994 |
| (303) 776- | landline | Longmont | Qwest Corp. | 02/04/1994 |
| (303) 777- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 778- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 779- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 780- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 781- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 782- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 783- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 784- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 785- | landline | Englewood | Xo Colorado | 11/20/1998 |
| (303) 786- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 787- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 788- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 789- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 790- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 791- | landline | Littleton | Qwest Corp. | 02/04/1994 |
| (303) 792- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 793- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 794- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 795- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 796- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 797- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 798- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 799- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 800- | landline | Denver | Level 3 Comms | 03/03/2001 |
| (303) 801- | landline | Denver | MCI Metro ATS | 10/11/1997 |
| (303) 802- | landline | Denver | Tw Telecom | 01/10/1996 |
| (303) 803- | landline | Denver | Tw Telecom | 04/15/1996 |
| (303) 804- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 805- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 806- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 807- | wireless | Denver | Cingular Wireless | 02/11/1995 |
| (303) 808- | wireless | Denver | Cingular Wireless | 02/11/1995 |
| (303) 809- | wireless | Denver | Cingular Wireless | 09/11/1994 |
| (303) 810- | wireless | Denver | Cingular Wireless | 01/10/1996 |
| (303) 812- | landline | Denver | Qwest Corp. | 09/11/1994 |
| (303) 813- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 814- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 815- | landline | Denver | Interlink Adv Svc D/b/a Forethought.net | 02/03/2005 |
| (303) 816- | landline | Denver | Qwest Corp. | 04/15/1996 |
| (303) 817- | wireless | Denver | Verizon Wireless | 01/10/1996 |
| (303) 818- | wireless | Denver | Verizon Wireless | 02/11/1995 |
| (303) 819- | wireless | Denver | Verizon Wireless | 02/11/1995 |
| (303) 820- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 821- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 822- | landline | Byers | Bijou Telephone Cooperative Association | 02/04/1994 |
| (303) 823- | landline | Lyons | Qwest Corp. | 02/04/1994 |
| (303) 824- | landline | Denver | Teleport Comms America | 01/11/1997 |
| (303) 825- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 826- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 827- | landline | Longmont | Icg Telecom Group | 04/01/1997 |
| (303) 828- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 829- | wireless | Denver | Verizon Wireless | 02/04/1994 |
| (303) 830- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 831- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 832- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 833- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 834- | wireless | Longmont | Verizon Wireless | 09/27/2006 |
| (303) 835- | landline | Brighton | Level 3 Comms | 01/11/1997 |
| (303) 836- | wireless | Denver | Comms Unlimited | 02/04/1994 |
| (303) 837- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 838- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 839- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 840- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 841- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 842- | wireless | Denver | Verizon Wireless | 01/25/1998 |
| (303) 843- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 844- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 845- | landline | Longmont | Teleport Comms America | 01/25/1998 |
| (303) 846- | landline | Denver | Qwest Corp. | 01/11/1997 |
| (303) 847- | landline | Denver | Level 3 Comms | 01/11/1997 |
| (303) 848- | landline | Longmont | Icg Telecom Group | 04/01/1997 |
| (303) 849- | landline | Roggen | Roggen Telephone Cooperative Co. | 02/04/1994 |
| (303) 850- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 851- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 852- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 853- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 854- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 855- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 856- | landline | Englewood | Icg Telecom Group | 04/01/1997 |
| (303) 857- | landline | Fort Lupton | Qwest Corp. | 02/04/1994 |
| (303) 858- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 859- | wireless | Denver | Verizon Wireless | 10/15/1996 |
| (303) 860- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 861- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 862- | landline | Denver | Comcast Phone | 06/04/2005 |
| (303) 863- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 864- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 865- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 866- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 867- | landline | Denver | Iloka DBA Newcloud Networks | 11/04/2005 |
| (303) 868- | wireless | Denver | Verizon Wireless | 02/04/1994 |
| (303) 869- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 870- | wireless | Denver | Verizon Wireless | 01/25/1998 |
| (303) 871- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 872- | landline | Denver | Level 3 Comms | 11/20/1998 |
| (303) 873- | landline | Aurora | Qwest Corp. | 01/11/1997 |
| (303) 874- | landline | Englewood | Icg Telecom Group | 04/01/1997 |
| (303) 875- | wireless | Denver | T-mobile USA | 10/15/1996 |
| (303) 876- | landline | Denver | MCI Metro ATS | 01/11/1997 |
| (303) 877- | wireless | Denver | Verizon Wireless | 02/04/1994 |
| (303) 878- | wireless | Denver | USA Mobility Wireless | 10/15/1996 |
| (303) 879- | wireless | Denver | USA Mobility Wireless | 10/15/1996 |
| (303) 880- | wireless | Denver | Verizon Wireless | 02/04/1994 |
| (303) 881- | wireless | Denver | Cingular Wireless | 07/01/1996 |
| (303) 882- | wireless | Denver | Cingular Wireless | 10/15/1996 |
| (303) 883- | wireless | Denver | Cingular Wireless | 01/11/1997 |
| (303) 884- | wireless | Denver | Cingular Wireless | 10/15/1996 |
| (303) 885- | wireless | Denver | Cingular Wireless | 04/12/2001 |
| (303) 886- | wireless | Denver | Cingular Wireless | 04/12/2001 |
| (303) 887- | wireless | Denver | Cingular Wireless | 04/12/2001 |
| (303) 888- | wireless | Denver | Cingular Wireless | 02/04/1994 |
| (303) 889- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 890- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 891- | wireless | Denver | USA Mobility Wireless | 02/04/1994 |
| (303) 892- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 893- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 894- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 895- | wireless | Denver | Verizon Wireless | 01/25/1998 |
| (303) 896- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 897- | wireless | Denver | USA Mobility Wireless | 01/11/1997 |
| (303) 898- | wireless | Denver | Cingular Wireless | 02/04/1994 |
| (303) 899- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 900- | landline | Idaho Springs | Level 3 Comms | 01/10/2007 |
| (303) 901- | wireless | Denver | Sprint | 07/06/1997 |
| (303) 902- | wireless | Denver | Verizon Wireless | 04/15/1996 |
| (303) 903- | wireless | Denver | Verizon Wireless | 07/01/1996 |
| (303) 904- | landline | Denver | Qwest Corp. | 02/11/1995 |
| (303) 905- | wireless | Denver | Verizon Wireless | 01/10/1996 |
| (303) 906- | wireless | Denver | Verizon Wireless | 02/11/1995 |
| (303) 907- | wireless | Denver | Verizon Wireless | 09/11/1994 |
| (303) 908- | wireless | Denver | Verizon Wireless | 09/11/1994 |
| (303) 909- | wireless | Denver | Verizon Wireless | 09/11/1994 |
| (303) 910- | wireless | Denver | Verizon Wireless | 02/11/1995 |
| (303) 912- | wireless | Denver | Verizon Wireless | 01/10/1996 |
| (303) 913- | wireless | Denver | Verizon Wireless | 07/04/1995 |
| (303) 914- | landline | Denver | Qwest Corp. | 09/11/1994 |
| (303) 915- | wireless | Denver | Verizon Wireless | 02/11/1995 |
| (303) 916- | wireless | Denver | Verizon Wireless | 02/11/1995 |
| (303) 917- | wireless | Denver | Verizon Wireless | 02/11/1995 |
| (303) 918- | wireless | Denver | Verizon Wireless | 02/11/1995 |
| (303) 919- | wireless | Denver | Verizon Wireless | 09/11/1994 |
| (303) 920- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 921- | wireless | Denver | Verizon Wireless | 10/15/1996 |
| (303) 922- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 923- | landline | Denver | Icg Telecom Group | 05/18/1998 |
| (303) 924- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 925- | landline | Denver | Qwest Corp. | 11/20/1998 |
| (303) 926- | landline | Denver | Qwest Corp. | 04/01/1997 |
| (303) 927- | landline | Denver | Teleport Comms America | 04/01/1997 |
| (303) 928- | landline | Denver | MCI Metro ATS | 01/25/1998 |
| (303) 929- | wireless | Denver | Verizon Wireless | 10/15/1996 |
| (303) 930- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 931- | wireless | Denver | T-mobile USA | 10/15/1996 |
| (303) 932- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 933- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 934- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 935- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 936- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 937- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 938- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 939- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 940- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 941- | wireless | Denver | Verizon Wireless | 02/04/1994 |
| (303) 942- | landline | Denver | Teleport Comms America | 01/11/1997 |
| (303) 943- | Nextwave Telecom, DBA Nextwave Wireless | 04/01/1997 | ||
| (303) 944- | wireless | Denver | Sprint | 04/01/1997 |
| (303) 945- | landline | Denver | Comcast Phone | 01/25/1998 |
| (303) 946- | wireless | Denver | Sprint | 01/11/1997 |
| (303) 947- | wireless | Denver | Verizon Wireless | 02/04/1994 |
| (303) 948- | landline | Denver | Qwest Corp. | 10/15/1996 |
| (303) 949- | wireless | Denver | Sprint | 01/25/1998 |
| (303) 951- | landline | Denver | Level 3 Comms | 02/27/1999 |
| (303) 952- | landline | Denver | Level 3 Comms | 11/20/1998 |
| (303) 953- | landline | Denver | Level 3 Comms | 02/27/1999 |
| (303) 954- | landline | Denver | Level 3 Comms | 02/27/1999 |
| (303) 955- | landline | Denver | Global Crossing Local Services | 08/14/1998 |
| (303) 956- | wireless | Fort Lupton | Cingular Wireless | 08/14/1998 |
| (303) 957- | landline | Denver | Global Crossing Local Services | 08/14/1998 |
| (303) 960- | wireless | Denver | T-mobile USA | 08/20/2000 |
| (303) 961- | wireless | Denver | Sprint | 11/20/1998 |
| (303) 962- | landline | Denver | Cbeyond Comms | 07/14/2005 |
| (303) 963- | landline | Denver | Icg Telecom Group | 04/01/1997 |
| (303) 964- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 965- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 966- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 967- | landline | Denver | Qwest Corp. | 01/11/1997 |
| (303) 968- | landline | Denver | MCI Metro ATS | 01/25/1998 |
| (303) 969- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 971- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 972- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 973- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 974- | landline | Denver | Global Crossing Local Services | 08/14/1998 |
| (303) 975- | landline | Denver | Qwest Corp. | 01/10/1996 |
| (303) 977- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 978- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 979- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 980- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 981- | wireless | Denver | Verizon Wireless | 02/04/1994 |
| (303) 982- | landline | Golden | Qwest Corp. | 02/04/1994 |
| (303) 984- | landline | Denver | Qwest Corp. | 10/15/1996 |
| (303) 985- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 986- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 987- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 988- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 989- | landline | Denver | Qwest Corp. | 02/04/1994 |
| (303) 990- | wireless | Fort Lupton | Sprint | 05/16/2006 |
| (303) 991- | landline | Denver | Xo Colorado | 08/14/1998 |
| (303) 992- | landline | Denver | Qwest Corp. | 08/14/1998 |
| (303) 993- | landline | Denver | Neutral Tandem | 03/27/2007 |
| (303) 994- | wireless | Denver | Sprint | 08/14/1998 |
| (303) 995- | wireless | Denver | Sprint | 11/20/1998 |
| (303) 996- | landline | Denver | Eschelon Telecom | 08/20/2000 |
| (303) 997- | landline | Denver | Pac - West Telecomm | 12/06/2005 |
| (303) 998- | landline | Denver | Qwest Corp. | 11/20/1998 |
| (303) 999- | landline | Denver | Comcast Phone | 08/24/2007 |