410 area code
The 410 area code is a North American telephone area code serving the eastern part of the U.S. state of Maryland, including the city of Baltimore. Established in 1991 as an overlay to the original 301 area code, 410 covers a diverse region, encompassing urban areas, suburban communities, and rural areas. It is a vital communication link for residents, businesses, and organizations within the state, facilitating telephone connections and telecommunications services. The area code has played a significant role in supporting Maryland's economic and social activities by providing a means for efficient and reliable communication.
| State | Maryland |
| Major City | Baltimore |
| Timezone | Eastern Time Zone (ET) |
What time zone is area code 410?
Area code 410 is situated in the Eastern Time Zone (ET), one of the four time zones in the contiguous United States. As such, it observes standard time during the non-daylight saving period and shifts to Eastern Daylight Time (EDT) during the daylight saving time period. The Eastern Time Zone is five hours behind Coordinated Universal Time (UTC-5) during standard time and four hours behind (UTC-4) when daylight saving time is in effect. This time zone encompasses a significant portion of the eastern United States, including Maryland, where area code 410 is primarily located.
Note that the start and end dates of daylight saving time can change
History
The 410 area code has a relatively recent history, established in 1991 as an overlay to the original 301 area code, which was reaching capacity due to the growing demand for telephone lines and services in Maryland. The introduction of the 410 overlay aimed to address the increasing need for new phone numbers while avoiding the disruption of existing ones. This overlay strategy allowed for the coexistence of multiple area codes within the same geographical area, ensuring a smooth transition for residents and businesses. Over the years, the 410 area code has become synonymous with the state's economic and cultural hub, Baltimore, as well as the broader Eastern Maryland region, playing a crucial role in facilitating communication and connectivity.
Nearby Areacodes of 410
This table provides a quick overview of all area codes, their locations, and some historical context for each.
| Area Code | Location | History and Details |
|---|---|---|
| 202 | District of Columbia | The 202 area code serves the District of Columbia, encompassing the nation's capital, Washington, D.C. Established in 1947, it has played a pivotal role in connecting government offices, residents, and businesses in the heart of the United States. |
| 223/717 | Lancaster, PA | Area codes 223 and 717 cover Lancaster, PA, and surrounding areas. These codes contribute to the telecommunications infrastructure, connecting residents and businesses in the region. |
| 240/301 | Germantown, MD | Area codes 240 and 301 cover Germantown, MD, and surrounding areas. These codes have been essential in providing communication services to residents and businesses in the region. |
| 302 | Delaware | The 302 area code serves the entire state of Delaware. Established in 1947, it has been instrumental in connecting residents, businesses, and organizations throughout the state. |
| 410/443/667 | Baltimore, MD | Area codes 410, 443, and 667 cover Baltimore, MD, and surrounding areas. These codes have played a crucial role in supporting communication needs in the vibrant city and its metropolitan region. |
| 434 | Lynchburg, VA | The 434 area code serves Lynchburg, VA, and surrounding areas. It has been essential in providing telecommunication services to the community, connecting residents and businesses. |
| 484/610 | Allentown, PA | Area codes 484 and 610 cover Allentown, PA, and surrounding areas. These codes contribute significantly to the telecommunications infrastructure, connecting residents and businesses in the region. |
| 540 | Roanoke, VA | The 540 area code serves Roanoke, VA, and surrounding areas. Established to meet the growing communication needs, it plays a vital role in connecting the community. |
| 571/703 | Arlington, VA | Area codes 571 and 703 cover Arlington, VA, and the surrounding metropolitan area. These codes are integral in providing telecommunication services to residents and businesses in this dynamic region. |
| 757 | Virginia Beach, VA | The 757 area code serves Virginia Beach, VA, and surrounding areas. It has been crucial in connecting the coastal community, supporting communication for residents and businesses. |
| 804 | Richmond, VA | The 804 area code covers Richmond, VA, and surrounding areas. Established to meet the growing communication needs of the capital city, it plays a key role in connecting the community. |
| 814 | Erie, PA | The 814 area code serves Erie, PA, and surrounding areas. Established to facilitate communication, it has been integral in connecting residents and businesses in the region. |
| 856 | Camden, NJ | The 856 area code serves Camden, NJ, and surrounding areas. It has been crucial in providing telecommunication services to this region, connecting residents and businesses. |
Counties in Area Code 410
Area code 410 covers a total of 16 counties in the state of Maryland. These counties include a diverse range of landscapes and communities, from the eastern plains to the western mountains.
| County | Total Population | % of 410 | % of County |
|---|---|---|---|
| Baltimore, MD | 805,029 | 9% | 100% |
| Baltimore, MD | 620,961 | 1% | 100% |
| Anne Arundel, MD | 537,656 | 7% | 93% |
| Worcester, MD | 51,454 | 8% | 84% |
| Talbot, MD | 37,782 | 6% | 100% |
| Caroline, MD | 33,066 | 4% | 100% |
| Dorchester, MD | 32,618 | 11% | 87% |
| Somerset, MD | 26,470 | 8% | 100% |
| Kent, MD | 20,197 | 6% | 100% |
| Cecil, MD | 101,108 | 6% | 100% |
| Wicomico, MD | 98,733 | 5% | 100% |
| Calvert, MD | 88,737 | 4% | 92% |
| Queen Anne's, MD | 47,798 | 7% | 100% |
| Harford, MD | 244,826 | 7% | 100% |
| Howard, MD | 287,085 | 3% | 76% |
| Carroll, MD | 167,134 | 6% | 96% |
Cities in Area Code 410
Here are the some of the major cities and towns in Maryland covered by area code 410 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 410 | % of County |
|---|---|---|---|
| Baltimore, MD | 620,961 | 1% | 100% |
| Columbia, MD | 99,615 | 0% | 93% |
| Glen Burnie, MD | 67,639 | 0% | 100% |
| Ellicott City, MD | 65,834 | 0% | 100% |
| Dundalk, MD | 63,597 | 0% | 100% |
| Towson, MD | 55,197 | 0% | 100% |
| Bel Air South, MD | 47,709 | 0% | 100% |
| Severn, MD | 44,231 | 0% | 100% |
| Catonsville, MD | 41,567 | 0% | 100% |
| Essex, MD | 39,262 | 0% | 100% |
| Annapolis, MD | 38,394 | 0% | 100% |
| Woodlawn, MD | 37,879 | 0% | 100% |
| Severna Park, MD | 37,634 | 0% | 100% |
| Odenton, MD | 37,132 | 0% | 100% |
| Randallstown, MD | 32,430 | 0% | 100% |
| Pikesville, MD | 30,764 | 0% | 100% |
| Parkville, MD | 30,734 | 0% | 100% |
| Owings Mills, MD | 30,622 | 0% | 100% |
| Bel Air North, MD | 30,568 | 0% | 100% |
| Eldersburg, MD | 30,531 | 1% | 100% |
| Salisbury, MD | 30,343 | 0% | 100% |
| Carney, MD | 29,941 | 0% | 100% |
| Milford Mill, MD | 29,042 | 0% | 100% |
| Perry Hall, MD | 28,474 | 0% | 100% |
| Crofton, MD | 27,348 | 0% | 100% |
| Reisterstown, MD | 25,968 | 0% | 100% |
| Edgewood, MD | 25,562 | 0% | 100% |
| Lochearn, MD | 25,333 | 0% | 100% |
| Middle River, MD | 25,191 | 0% | 100% |
| Pasadena, MD | 24,287 | 0% | 100% |
| Ilchester, MD | 23,476 | 0% | 100% |
| Arnold, MD | 23,106 | 0% | 100% |
| Cockeysville, MD | 20,776 | 0% | 100% |
| Arbutus, MD | 20,483 | 0% | 100% |
| Lake Shore, MD | 19,477 | 0% | 100% |
| Rosedale, MD | 19,257 | 0% | 100% |
| Westminster, MD | 18,590 | 0% | 100% |
| Ferndale, MD | 16,746 | 0% | 100% |
| Easton, MD | 15,945 | 0% | 100% |
| Parole, MD | 15,922 | 0% | 100% |
| Elkridge, MD | 15,593 | 0% | 100% |
| Elkton, MD | 15,443 | 0% | 100% |
| Rossville, MD | 15,147 | 0% | 100% |
| Aberdeen, MD | 14,959 | 0% | 100% |
| Brooklyn Park, MD | 14,373 | 0% | 100% |
| Havre de Grace, MD | 12,952 | 0% | 100% |
| Riviera Beach, MD | 12,677 | 0% | 100% |
| Joppatowne, MD | 12,616 | 0% | 100% |
| Cambridge, MD | 12,326 | 0% | 100% |
| Overlea, MD | 12,275 | 0% | 100% |
Largest telephone carriers in area code 410
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 |
|---|---|---|
| Verizon | 64% | - |
| Mci Worldcom | 5% | - |
| Teleport America | 2% | - |
| Tw Telecom | 1% | - |
| Cavalier Telephone Mid-atlantic | 1% | - |
| Cingular | 6% | 8% |
| Baltimore-washington Telephone (bwt) | 1% | - |
| Verizon | 2% | - |
| Level 3 | 1% | - |
| Other | 3% | - |
| Verizon Wireless | - | 6% |
| USA Mobility Wireless | - | 4% |
| Sprint | - | 3% |
| Redi-call | - | 1% |
| Aquis | - | 1% |
| Other | - | 1% |
Prefixes in Area Code 410
Below is the list of some of Prefixes in area code 410
| Prefix | Usage | Primary City | Carrier | Introduction Date |
|---|---|---|---|---|
| (410) 200- | landline | Easton | Mci Worldcom Comms | 05/27/2004 |
| (410) 202- | landline | Salisbury | Verizon Wireless | 10/14/2004 |
| (410) 203- | landline | Ellicott City | 07/04/1995 | |
| (410) 204- | landline | Arbutus | 02/04/1994 | |
| (410) 205- | landline | Baltimore | 02/04/1994 | |
| (410) 206- | wireless | Catonsville | Cingular Wireless | 04/15/1996 |
| (410) 207- | wireless | Baltimore | Verizon Wireless | 04/15/1996 |
| (410) 208- | landline | Berlin | 02/04/1994 | |
| (410) 209- | landline | Baltimore | 07/01/1996 | |
| (410) 210- | wireless | Salisbury | Aquis Comms | 07/01/1996 |
| (410) 212- | wireless | Annapolis | Sprint | 01/10/1996 |
| (410) 213- | landline | Ocean City | 02/04/1994 | |
| (410) 214- | landline | Rising Sun | Core Comms | 03/11/2009 |
| (410) 215- | wireless | Baltimore | Verizon Wireless | 02/11/1995 |
| (410) 216- | landline | Annapolis | 01/10/1996 | |
| (410) 217- | wireless | Baltimore | 04/15/1996 | |
| (410) 218- | wireless | Baltimore | Verizon Wireless | 02/04/1994 |
| (410) 219- | landline | Salisbury | 02/04/1994 | |
| (410) 220- | wireless | Elkridge | Sprint | 09/30/2011 |
| (410) 221- | landline | Cambridge | 02/04/1994 | |
| (410) 222- | landline | Severn | 02/04/1994 | |
| (410) 223- | landline | Baltimore | 09/11/1994 | |
| (410) 224- | landline | Annapolis | 02/04/1994 | |
| (410) 225- | landline | Baltimore | 02/04/1994 | |
| (410) 226- | landline | Oxford | 02/04/1994 | |
| (410) 227- | wireless | Catonsville | Cingular Wireless | 07/04/1995 |
| (410) 228- | landline | Cambridge | 02/04/1994 | |
| (410) 229- | landline | Cockeysville | 01/10/1996 | |
| (410) 230- | landline | Baltimore | 10/11/1997 | |
| (410) 231- | wireless | Solomons | Cingular Wireless | 01/10/1996 |
| (410) 232- | wireless | Baltimore | USA Mobility Wireless | 02/04/1994 |
| (410) 233- | landline | Baltimore | 02/04/1994 | |
| (410) 234- | landline | Baltimore | 02/04/1994 | |
| (410) 235- | landline | Baltimore | 02/04/1994 | |
| (410) 236- | wireless | Towson | Cingular Wireless | 04/15/1996 |
| (410) 237- | landline | Baltimore | 02/04/1994 | |
| (410) 238- | landline | Essex | 10/15/1996 | |
| (410) 239- | landline | Hampstead | 02/04/1994 | |
| (410) 240- | wireless | Baltimore | Sprint | 10/06/2011 |
| (410) 241- | wireless | Baltimore | Verizon Wireless | 02/04/1994 |
| (410) 242- | landline | Arbutus | 02/04/1994 | |
| (410) 243- | landline | Baltimore | 02/04/1994 | |
| (410) 244- | landline | Baltimore | 02/04/1994 | |
| (410) 245- | wireless | Catonsville | Cingular Wireless | 09/11/1994 |
| (410) 246- | landline | Baltimore | Mci Worldcom Comms | 02/11/1995 |
| (410) 247- | landline | Arbutus | 02/04/1994 | |
| (410) 248- | landline | Parkville | 01/25/1998 | |
| (410) 249- | wireless | Towson | 10/15/1996 | |
| (410) 250- | landline | Ocean City | 02/04/1994 | |
| (410) 251- | wireless | Salisbury | Verizon Wireless | 01/10/1996 |
| (410) 252- | landline | Towson | 02/04/1994 | |
| (410) 253- | wireless | Easton | Cingular Wireless | 01/10/1996 |
| (410) 254- | landline | Baltimore | 02/04/1994 | |
| (410) 255- | landline | Pasadena | 02/04/1994 | |
| (410) 256- | landline | Parkville | 02/04/1994 | |
| (410) 257- | landline | North Beach | 02/04/1994 | |
| (410) 258- | wireless | Baltimore | Sprint | 01/10/1996 |
| (410) 259- | wireless | Westminster | Verizon Wireless | 02/11/1995 |
| (410) 260- | landline | Annapolis | 02/04/1994 | |
| (410) 261- | landline | Baltimore | 10/15/1996 | |
| (410) 262- | wireless | Baltimore | Sprint | 04/01/1997 |
| (410) 263- | landline | Annapolis | 02/04/1994 | |
| (410) 264- | wireless | Laurel | 07/04/1995 | |
| (410) 265- | landline | Woodlawn | 02/04/1994 | |
| (410) 266- | landline | Annapolis | 02/04/1994 | |
| (410) 267- | landline | Annapolis | 02/04/1994 | |
| (410) 268- | landline | Annapolis | 02/04/1994 | |
| (410) 269- | landline | Annapolis | 02/04/1994 | |
| (410) 270- | wireless | Salisbury | Redi-call Comms Co | 02/04/1994 |
| (410) 271- | wireless | Annapolis | Verizon Wireless | 02/11/1995 |
| (410) 272- | landline | Aberdeen | 02/04/1994 | |
| (410) 273- | landline | Aberdeen | 02/04/1994 | |
| (410) 274- | wireless | Baltimore | Verizon Wireless | 02/11/1995 |
| (410) 275- | landline | Warwick | 02/04/1994 | |
| (410) 276- | landline | Baltimore | 02/04/1994 | |
| (410) 277- | landline | Woodlawn | 10/15/1996 | |
| (410) 278- | landline | Aberdeen | 02/04/1994 | |
| (410) 279- | wireless | Annapolis | Verizon Wireless | 04/15/1996 |
| (410) 280- | landline | Annapolis | 02/04/1994 | |
| (410) 281- | landline | Woodlawn | 02/04/1994 | |
| (410) 282- | landline | Dundalk | 02/04/1994 | |
| (410) 283- | wireless | Towson | USA Mobility Wireless | 04/15/1996 |
| (410) 284- | landline | Dundalk | 02/04/1994 | |
| (410) 285- | landline | Dundalk | 02/04/1994 | |
| (410) 286- | landline | North Beach | 10/15/1996 | |
| (410) 287- | landline | North East | 02/04/1994 | |
| (410) 288- | landline | Dundalk | 02/04/1994 | |
| (410) 289- | landline | Ocean City | 02/04/1994 | |
| (410) 290- | landline | Columbia | 02/04/1994 | |
| (410) 291- | landline | Baltimore | 02/04/1994 | |
| (410) 292- | wireless | Catonsville | Cingular Wireless | 02/11/1995 |
| (410) 293- | landline | Annapolis | Paetec Comms | 09/11/1994 |
| (410) 294- | wireless | Catonsville | Cingular Wireless | 04/15/1996 |
| (410) 295- | landline | Annapolis | 04/15/1996 | |
| (410) 296- | landline | Towson | 02/04/1994 | |
| (410) 297- | landline | Aberdeen | 01/11/1997 | |
| (410) 298- | landline | Woodlawn | 02/04/1994 | |
| (410) 299- | wireless | Baltimore | Verizon Wireless | 04/01/1997 |
| (410) 300- | wireless | Elkridge | Sprint | 07/15/2004 |
| (410) 301- | wireless | Baltimore | Sprint | 10/06/2011 |
| (410) 302- | wireless | Catonsville | Cingular Wireless | 02/04/1994 |
| (410) 303- | wireless | Baltimore | Verizon Wireless | 04/15/1996 |
| (410) 304- | landline | Queenstown | Idt America Corp | 03/29/2006 |
| (410) 305- | landline | Odenton | 02/04/1994 | |
| (410) 306- | landline | Aberdeen | 07/01/1996 | |
| (410) 307- | landline | Towson | 02/04/1994 | |
| (410) 308- | landline | Towson | 07/01/1996 | |
| (410) 309- | landline | Columbia | 04/15/1996 | |
| (410) 310- | wireless | Easton | Verizon Wireless | 02/04/1994 |
| (410) 312- | landline | Columbia | 02/04/1994 | |
| (410) 313- | landline | Ellicott City | 02/04/1994 | |
| (410) 314- | landline | Baltimore | Mci Worldcom Comms | 07/01/1996 |
| (410) 315- | landline | Severna Park | 02/04/1994 | |
| (410) 316- | landline | Cockeysville | 02/04/1994 | |
| (410) 317- | landline | Baltimore | Mci Worldcom Comms | 07/01/1996 |
| (410) 318- | landline | Baltimore | 04/15/1996 | |
| (410) 319- | landline | Baltimore | 02/04/1994 | |
| (410) 320- | wireless | Annapolis | Sprint | 04/01/1997 |
| (410) 321- | landline | Towson | 02/04/1994 | |
| (410) 322- | wireless | Bel Air | Cingular Wireless | 07/06/1997 |
| (410) 323- | landline | Baltimore | 02/04/1994 | |
| (410) 324- | landline | Towson | 02/04/1994 | |
| (410) 325- | landline | Baltimore | 02/04/1994 | |
| (410) 326- | landline | Solomons | 02/04/1994 | |
| (410) 327- | landline | Baltimore | 02/04/1994 | |
| (410) 328- | landline | Baltimore | 02/04/1994 | |
| (410) 329- | landline | Cockeysville | 02/04/1994 | |
| (410) 330- | wireless | Cambridge | Cingular Wireless | 01/10/1996 |
| (410) 331- | wireless | Elkridge | USA Mobility Wireless | 01/10/1996 |
| (410) 332- | landline | Baltimore | 02/04/1994 | |
| (410) 333- | landline | Baltimore | 02/04/1994 | |
| (410) 334- | landline | Salisbury | 02/04/1994 | |
| (410) 335- | landline | White Marsh | 02/04/1994 | |
| (410) 336- | wireless | Baltimore | Cingular Wireless | 10/15/1996 |
| (410) 337- | landline | Towson | 02/04/1994 | |
| (410) 338- | landline | Baltimore | 02/04/1994 | |
| (410) 339- | landline | Towson | 02/04/1994 | |
| (410) 340- | wireless | Baltimore | Cingular Wireless | 10/11/1997 |
| (410) 341- | landline | Salisbury | 07/04/1995 | |
| (410) 342- | landline | Baltimore | 02/04/1994 | |
| (410) 343- | landline | Parkton | 02/04/1994 | |
| (410) 344- | landline | White Marsh | 04/15/1996 | |
| (410) 345- | landline | Pikesville | 04/15/1996 | |
| (410) 346- | landline | Westminster | 02/04/1994 | |
| (410) 347- | landline | Baltimore | 02/04/1994 | |
| (410) 348- | landline | Still Pond | 02/04/1994 | |
| (410) 349- | landline | Annapolis | 09/11/1994 | |
| (410) 350- | landline | Baltimore | 10/11/1997 | |
| (410) 351- | wireless | Baltimore | USA Mobility Wireless | 02/04/1994 |
| (410) 352- | landline | Bishopville | 02/04/1994 | |
| (410) 353- | wireless | Annapolis | Verizon Wireless | 02/11/1995 |
| (410) 354- | landline | Baltimore | 02/04/1994 | |
| (410) 355- | landline | Baltimore | 02/04/1994 | |
| (410) 356- | landline | Pikesville | 02/04/1994 | |
| (410) 357- | landline | Parkton | 02/04/1994 | |
| (410) 358- | landline | Baltimore | 02/04/1994 | |
| (410) 359- | wireless | Baltimore | 09/11/1994 | |
| (410) 360- | landline | Pasadena | 02/04/1994 | |
| (410) 361- | landline | Baltimore | 02/04/1994 | |
| (410) 362- | landline | Baltimore | 02/04/1994 | |
| (410) 363- | landline | Pikesville | 02/04/1994 | |
| (410) 364- | landline | Queen Anne | 02/04/1994 | |
| (410) 365- | wireless | Baltimore | Sprint | 02/11/1995 |
| (410) 366- | landline | Baltimore | 02/04/1994 | |
| (410) 367- | landline | Baltimore | 02/04/1994 | |
| (410) 368- | landline | Baltimore | 02/04/1994 | |
| (410) 369- | landline | Baltimore | Tw Telecom | 07/06/1997 |
| (410) 370- | wireless | Catonsville | Cingular Wireless | 02/04/1994 |
| (410) 371- | wireless | Baltimore | Verizon Wireless | 09/11/1994 |
| (410) 372- | landline | Towson | 07/04/1995 | |
| (410) 373- | wireless | Towson | USA Mobility Wireless | 02/11/1995 |
| (410) 374- | landline | Hampstead | 02/04/1994 | |
| (410) 375- | wireless | Baltimore | Verizon Wireless | 01/10/1996 |
| (410) 376- | landline | Mardela Springs | 02/04/1994 | |
| (410) 377- | landline | Towson | 02/04/1994 | |
| (410) 378- | landline | Port Deposit | 02/04/1994 | |
| (410) 379- | landline | Elkridge | 02/04/1994 | |
| (410) 380- | wireless | Salisbury | Redi-call Comms Co | 02/04/1994 |
| (410) 381- | landline | Columbia | 02/04/1994 | |
| (410) 382- | wireless | Baltimore | Verizon Wireless | 02/04/1994 |
| (410) 383- | landline | Baltimore | 02/04/1994 | |
| (410) 384- | landline | Severna Park | 10/15/1996 | |
| (410) 385- | landline | Baltimore | 02/04/1994 | |
| (410) 386- | landline | Westminster | 02/11/1995 | |
| (410) 387- | wireless | Arbutus | Broadview Networks | 08/12/2011 |
| (410) 388- | landline | Sparrows Point | 02/04/1994 | |
| (410) 389- | wireless | Baltimore | USA Mobility Wireless | 02/04/1994 |
| (410) 390- | landline | Ocean City | Teleport Comms America | 06/10/2009 |
| (410) 391- | landline | Essex | 02/04/1994 | |
| (410) 392- | landline | Elkton | 02/04/1994 | |
| (410) 393- | landline | Cockeysville | 02/04/1994 | |
| (410) 394- | landline | Solomons | 10/15/1996 | |
| (410) 395- | wireless | Arbutus | 09/11/1994 | |
| (410) 396- | landline | Baltimore | 02/04/1994 | |
| (410) 397- | landline | Crapo | 02/04/1994 | |
| (410) 398- | landline | Elkton | 02/04/1994 | |
| (410) 399- | landline | Bel Air | 02/04/1994 | |
| (410) 400- | landline | Baltimore | Cavalier Telephone Mid-atlantic | 06/15/2006 |
| (410) 401- | landline | Baltimore | Mci Worldcom Comms | 07/01/1996 |
| (410) 402- | landline | Baltimore | Mci Worldcom Comms | 07/01/1996 |
| (410) 403- | landline | Baltimore | Mci Worldcom Comms | 07/01/1996 |
| (410) 404- | wireless | Baltimore | Verizon Wireless | 02/04/1994 |
| (410) 405- | landline | Fork | 07/01/1996 | |
| (410) 406- | landline | Baltimore | Mci Worldcom Comms | 07/01/1996 |
| (410) 407- | wireless | Elkridge | 02/04/1994 | |
| (410) 408- | wireless | Towson | USA Mobility Wireless | 02/04/1994 |
| (410) 409- | wireless | Baltimore | Verizon Wireless | 04/15/1996 |
| (410) 412- | landline | Baltimore | Mci Worldcom Comms | 07/01/1996 |
| (410) 413- | landline | Baltimore | Mci Worldcom Comms | 07/01/1996 |
| (410) 414- | landline | Prince Frederick | 01/10/1996 | |
| (410) 415- | landline | Pikesville | 07/01/1996 | |
| (410) 416- | wireless | Laurel | 01/10/1996 | |
| (410) 417- | landline | Edgewood | 08/16/2007 | |
| (410) 418- | landline | Ellicott City | 02/04/1994 | |
| (410) 419- | wireless | Baltimore | Sprint | 07/06/1997 |
| (410) 420- | landline | Bel Air | 01/25/1998 | |
| (410) 421- | landline | Severna Park | 10/15/1996 | |
| (410) 422- | wireless | Salisbury | Cingular Wireless | 07/06/1997 |
| (410) 423- | landline | Baltimore | Teleport Comms America | 04/01/1997 |
| (410) 424- | landline | Glen Burnie | 10/15/1996 | |
| (410) 425- | landline | Ewell | 02/04/1994 | |
| (410) 426- | landline | Baltimore | 02/04/1994 | |
| (410) 427- | landline | Baltimore | Teleport Comms America | 01/10/1996 |
| (410) 428- | wireless | Catonsville | Cingular Wireless | 01/10/1996 |
| (410) 429- | landline | Reisterstown | 02/04/1994 | |
| (410) 430- | wireless | Salisbury | Verizon Wireless | 02/04/1994 |
| (410) 431- | landline | Severna Park | 02/11/1995 | |
| (410) 432- | landline | Severna Park | 05/18/1998 | |
| (410) 433- | landline | Baltimore | 02/04/1994 | |
| (410) 434- | wireless | Towson | USA Mobility Wireless | 04/01/1997 |
| (410) 435- | landline | Baltimore | 02/04/1994 | |
| (410) 436- | landline | Edgewood | 04/01/1997 | |
| (410) 437- | landline | Pasadena | 02/04/1994 | |
| (410) 438- | landline | Barclay | 02/04/1994 | |
| (410) 439- | landline | Pasadena | 01/10/1996 | |
| (410) 440- | wireless | Catonsville | Cingular Wireless | 02/04/1994 |
| (410) 441- | wireless | Elkton | Cingular Wireless | 04/01/1997 |
| (410) 442- | landline | Glenwood | 02/04/1994 | |
| (410) 443- | landline | Easton | Level 3 Comms | 07/23/2002 |
| (410) 444- | landline | Baltimore | 02/04/1994 | |
| (410) 445- | wireless | Baltimore | USA Mobility Wireless | 04/01/1997 |
| (410) 446- | wireless | Catonsville | Cingular Wireless | 02/04/1994 |
| (410) 447- | wireless | Columbia | USA Mobility Wireless | 02/04/1994 |
| (410) 448- | landline | Baltimore | 02/04/1994 | |
| (410) 449- | landline | Solomons | Bandwidth.com | 02/12/2010 |
| (410) 450- | landline | Baltimore | 02/04/1994 | |
| (410) 451- | landline | Crofton | 02/04/1994 | |
| (410) 452- | landline | Cardiff | 02/04/1994 | |
| (410) 453- | landline | Towson | 09/11/1994 | |
| (410) 454- | landline | Baltimore | Mci Worldcom Comms | 10/11/1997 |
| (410) 455- | landline | Catonsville | 02/04/1994 | |
| (410) 456- | wireless | Baltimore | Verizon Wireless | 02/04/1994 |
| (410) 457- | landline | Darlington | 02/04/1994 | |
| (410) 458- | wireless | Baltimore | Verizon Wireless | 02/04/1994 |
| (410) 459- | wireless | Fallston | Verizon Wireless | 09/11/1994 |
| (410) 460- | wireless | Elkridge | USA Mobility Wireless | 07/06/1997 |
| (410) 461- | landline | Ellicott City | 02/04/1994 | |
| (410) 462- | landline | Baltimore | 02/04/1994 | |
| (410) 463- | wireless | Trappe | Verizon Wireless | 02/11/1995 |
| (410) 464- | landline | Baltimore | 07/06/1997 | |
| (410) 465- | landline | Ellicott City | 02/04/1994 | |
| (410) 466- | landline | Baltimore | 02/04/1994 | |
| (410) 467- | landline | Baltimore | 02/04/1994 | |
| (410) 468- | landline | Baltimore | 04/01/1997 | |
| (410) 469- | landline | Baltimore | 10/15/1996 | |
| (410) 470- | landline | Baltimore | 06/28/2005 | |
| (410) 471- | landline | Elkridge | 02/04/1994 | |
| (410) 472- | landline | Sparks Glencoe | 02/04/1994 | |
| (410) 473- | wireless | Towson | USA Mobility Wireless | 01/10/1996 |
| (410) 474- | wireless | Prince Frederick | Verizon Wireless | 04/15/1996 |
| (410) 475- | wireless | Towson | USA Mobility Wireless | 02/11/1995 |
| (410) 476- | landline | Trappe | 02/04/1994 | |
| (410) 477- | landline | Sparrows Point | 02/04/1994 | |
| (410) 478- | wireless | Elkridge | USA Mobility Wireless | 02/11/1995 |
| (410) 479- | landline | Denton | 02/04/1994 | |
| (410) 480- | landline | Ellicott City | 01/11/1997 | |
| (410) 482- | landline | Greensboro | 02/04/1994 | |
| (410) 483- | landline | Baltimore | 02/04/1994 | |
| (410) 484- | landline | Pikesville | 02/04/1994 | |
| (410) 485- | landline | Baltimore | 02/04/1994 | |
| (410) 486- | landline | Pikesville | 02/04/1994 | |
| (410) 487- | landline | Baltimore | Mci Worldcom Comms | 01/10/1996 |
| (410) 488- | landline | Baltimore | 02/04/1994 | |
| (410) 489- | landline | Glenwood | 02/04/1994 | |
| (410) 490- | wireless | Centreville | Verizon Wireless | 04/01/1997 |
| (410) 491- | wireless | Catonsville | Cingular Wireless | 09/11/1994 |
| (410) 492- | wireless | Towson | USA Mobility Wireless | 10/15/1996 |
| (410) 493- | wireless | Baltimore | Sprint | 01/10/1996 |
| (410) 494- | landline | Towson | 02/04/1994 | |
| (410) 495- | landline | Port Republic | 04/15/1996 | |
| (410) 496- | landline | Randallstown | 10/15/1996 | |
| (410) 497- | landline | Baltimore | Comcast Phone Of Northern Maryland | 07/06/1997 |
| (410) 498- | landline | Baltimore | Cavalier Telephone Mid-atlantic | 07/06/1997 |
| (410) 499- | wireless | Baltimore | Sprint | 10/15/1996 |
| (410) 500- | landline | Baltimore | 06/25/2005 | |
| (410) 501- | landline | Arbutus | Lightwave Comms | 06/28/2005 |
| (410) 502- | landline | Baltimore | 10/15/1996 | |
| (410) 503- | wireless | Elkridge | 10/15/1996 | |
| (410) 504- | landline | Baltimore | 07/06/1997 | |
| (410) 505- | landline | Ellicott City | 07/01/1996 | |
| (410) 506- | landline | Elkton | 07/06/1997 | |
| (410) 507- | wireless | Annapolis | Verizon Wireless | 04/15/1996 |
| (410) 508- | landline | Glen Burnie | 02/04/1994 | |
| (410) 509- | landline | Baltimore | Baltimore-washington Telephone (bwt) | 10/11/1997 |
| (410) 510- | landline | Fork | Teleport Comms America | 07/01/1996 |
| (410) 512- | landline | Towson | 02/04/1994 | |
| (410) 513- | landline | Baltimore | Teleport Comms America | 01/25/1998 |
| (410) 514- | landline | Severn | 02/04/1994 | |
| (410) 515- | landline | Abingdon | 02/04/1994 | |
| (410) 516- | landline | Baltimore | 02/04/1994 | |
| (410) 517- | landline | Reisterstown | 10/15/1996 | |
| (410) 518- | landline | Severna Park | 07/01/1996 | |
| (410) 519- | landline | Severn | 02/04/1994 | |
| (410) 520- | landline | Ocean City | 01/25/1998 | |
| (410) 521- | landline | Randallstown | 02/04/1994 | |
| (410) 522- | landline | Baltimore | 02/04/1994 | |
| (410) 523- | landline | Baltimore | 02/04/1994 | |
| (410) 524- | landline | Ocean City | 02/04/1994 | |
| (410) 525- | landline | Baltimore | 02/04/1994 | |
| (410) 526- | landline | Reisterstown | 02/04/1994 | |
| (410) 527- | landline | Cockeysville | 02/04/1994 | |
| (410) 528- | landline | Baltimore | 02/04/1994 | |
| (410) 529- | landline | Parkville | 02/04/1994 | |
| (410) 530- | wireless | Catonsville | Cingular Wireless | 04/01/1997 |
| (410) 531- | landline | Columbia | 02/04/1994 | |
| (410) 532- | landline | Baltimore | 02/04/1994 | |
| (410) 533- | wireless | Annapolis | Cingular Wireless | 02/04/1994 |
| (410) 534- | landline | Baltimore | 02/04/1994 | |
| (410) 535- | landline | Port Republic | 02/04/1994 | |
| (410) 536- | landline | Arbutus | 02/04/1994 | |
| (410) 537- | landline | Baltimore | 02/04/1994 | |
| (410) 538- | landline | Edgewood | 02/04/1994 | |
| (410) 539- | landline | Baltimore | 02/04/1994 | |
| (410) 540- | landline | Elkridge | 10/15/1996 | |
| (410) 541- | landline | Severna Park | 02/04/1994 | |
| (410) 542- | landline | Baltimore | 02/04/1994 | |
| (410) 543- | landline | Salisbury | 02/04/1994 | |
| (410) 544- | landline | Severna Park | 02/04/1994 | |
| (410) 545- | landline | Baltimore | 02/04/1994 | |
| (410) 546- | landline | Salisbury | 02/04/1994 | |
| (410) 547- | landline | Baltimore | 02/04/1994 | |
| (410) 548- | landline | Salisbury | 02/04/1994 | |
| (410) 549- | landline | Sykesville | 02/04/1994 | |
| (410) 550- | landline | Baltimore | 02/04/1994 | |
| (410) 551- | landline | Severn | 02/04/1994 | |
| (410) 552- | landline | Sykesville | 04/15/1996 | |
| (410) 553- | landline | Glen Burnie | 02/04/1994 | |
| (410) 554- | landline | Baltimore | 02/04/1994 | |
| (410) 556- | landline | Church Hill | 02/04/1994 | |
| (410) 557- | landline | Jarrettsville | 02/04/1994 | |
| (410) 558- | landline | Baltimore | 02/04/1994 | |
| (410) 559- | landline | Baltimore | Teleport Comms America | 01/10/1996 |
| (410) 560- | landline | Towson | 02/04/1994 | |
| (410) 561- | landline | Cockeysville | 02/04/1994 | |
| (410) 562- | wireless | Annapolis | Cingular Wireless | 02/04/1994 |
| (410) 563- | landline | Baltimore | 02/04/1994 | |
| (410) 564- | landline | Baltimore | Teleport Comms America | 01/10/1996 |
| (410) 565- | landline | Arbutus | Tw Telecom | 01/25/1998 |
| (410) 566- | landline | Baltimore | 02/04/1994 | |
| (410) 567- | landline | Baltimore | Mci Worldcom Comms | 04/01/1997 |
| (410) 568- | landline | Baltimore | Teleport Comms America | 01/10/1996 |
| (410) 569- | landline | Edgewood | 02/04/1994 | |
| (410) 570- | wireless | Annapolis | Cingular Wireless | 07/04/1995 |
| (410) 571- | landline | Annapolis | 01/10/1996 | |
| (410) 572- | landline | Salisbury | 01/11/1997 | |
| (410) 573- | landline | Annapolis | 02/04/1994 | |
| (410) 574- | landline | Essex | 02/04/1994 | |
| (410) 575- | landline | Aberdeen | 02/04/1994 | |
| (410) 576- | landline | Baltimore | 02/04/1994 | |
| (410) 577- | landline | Baltimore | 05/10/2005 | |
| (410) 578- | landline | Baltimore | 02/04/1994 | |
| (410) 579- | landline | Elkridge | 02/11/1995 | |
| (410) 580- | landline | Pikesville | 01/25/1998 | |
| (410) 581- | landline | Pikesville | 02/04/1994 | |
| (410) 582- | landline | Glen Burnie | 02/04/1994 | |
| (410) 583- | landline | Towson | 02/04/1994 | |
| (410) 584- | landline | Cockeysville | 02/04/1994 | |
| (410) 585- | landline | Baltimore | 01/25/1998 | |
| (410) 586- | landline | Port Republic | 02/04/1994 | |
| (410) 587- | landline | Arbutus | 02/11/1995 | |
| (410) 588- | landline | Bel Air | 02/11/1995 | |
| (410) 589- | landline | Brooklyn | Tw Telecom | 01/25/1998 |
| (410) 590- | landline | Glen Burnie | 02/11/1995 | |
| (410) 591- | wireless | Baltimore | Verizon Wireless | 02/04/1994 |
| (410) 592- | landline | Fork | 02/04/1994 | |
| (410) 593- | landline | Fork | 10/11/1997 | |
| (410) 594- | landline | Woodlawn | 02/04/1994 | |
| (410) 595- | landline | Laurel | Tw Telecom | 01/25/1998 |
| (410) 596- | wireless | Westminster | Verizon Wireless | 04/01/1997 |
| (410) 597- | landline | Woodlawn | 02/04/1994 | |
| (410) 598- | wireless | Baltimore | Verizon Wireless | 01/10/1996 |
| (410) 599- | wireless | Catonsville | Cingular Wireless | 02/11/1995 |
| (410) 600- | landline | Berlin | Sprint CommsCo., | 04/25/2006 |
| (410) 601- | landline | Baltimore | 07/01/1996 | |
| (410) 602- | landline | Pikesville | 02/04/1994 | |
| (410) 603- | wireless | Salisbury | Cingular Wireless | 02/04/1994 |
| (410) 604- | landline | Stevensville | 07/01/1996 | |
| (410) 605- | landline | Baltimore | 02/04/1994 | |
| (410) 606- | wireless | Beltsville | 10/15/1996 | |
| (410) 607- | wireless | Towson | USA Mobility Wireless | 02/04/1994 |
| (410) 608- | wireless | Catonsville | Cingular Wireless | 02/04/1994 |
| (410) 609- | landline | Brooklyn | 10/15/1996 | |
| (410) 610- | wireless | Prince Frederick | Verizon Wireless | 02/04/1994 |
| (410) 612- | landline | Edgewood | 02/04/1994 | |
| (410) 613- | landline | Baltimore | 02/04/1994 | |
| (410) 614- | landline | Baltimore | 02/04/1994 | |
| (410) 615- | wireless | Catonsville | Cingular Wireless | 09/11/1994 |
| (410) 616- | landline | Baltimore | Mci Worldcom Comms | 01/10/1996 |
| (410) 617- | landline | Baltimore | 02/04/1994 | |
| (410) 618- | wireless | Salisbury | Idt America Corp | 11/07/2011 |
| (410) 619- | wireless | Laurel | 01/10/1996 | |
| (410) 620- | landline | Elkton | 02/11/1995 | |
| (410) 621- | landline | Princess Anne | 10/15/1996 | |
| (410) 622- | wireless | Salisbury | Mci Worldcom Comms | 08/12/2011 |
| (410) 623- | landline | Marion | 02/04/1994 | |
| (410) 624- | landline | Baltimore | 02/04/1994 | |
| (410) 625- | landline | Baltimore | 02/04/1994 | |
| (410) 626- | landline | Annapolis | 02/04/1994 | |
| (410) 627- | wireless | Baltimore | Verizon Wireless | 07/04/1995 |
| (410) 628- | landline | Cockeysville | 02/04/1994 | |
| (410) 629- | landline | Berlin | 01/10/1996 | |
| (410) 630- | landline | Baltimore | Mci Worldcom Comms | 04/01/1997 |
| (410) 631- | landline | Baltimore | 02/04/1994 | |
| (410) 632- | landline | Snow Hill | 02/04/1994 | |
| (410) 633- | landline | Baltimore | 02/04/1994 | |
| (410) 634- | landline | Ridgely | 02/04/1994 | |
| (410) 635- | landline | New Windsor | 02/04/1994 | |
| (410) 636- | landline | Brooklyn | 02/04/1994 | |
| (410) 637- | landline | Baltimore | 02/04/1994 | |
| (410) 638- | landline | Bel Air | 02/04/1994 | |
| (410) 639- | landline | Rock Hall | 02/04/1994 | |
| (410) 640- | wireless | Baltimore | USA Mobility Wireless | 10/15/1996 |
| (410) 641- | landline | Berlin | 02/04/1994 | |
| (410) 642- | landline | Perryville | 02/04/1994 | |
| (410) 643- | landline | Stevensville | 02/04/1994 | |
| (410) 644- | landline | Baltimore | 02/04/1994 | |
| (410) 645- | landline | Baltimore | Mci Worldcom Comms | 01/10/1996 |
| (410) 646- | landline | Baltimore | 02/04/1994 | |
| (410) 647- | landline | Severna Park | 02/04/1994 | |
| (410) 648- | landline | Galena | 02/04/1994 | |
| (410) 649- | landline | Baltimore | Teleport Comms America | 01/10/1996 |
| (410) 650- | landline | Baltimore | Mci Worldcom Comms | 04/01/1997 |
| (410) 651- | landline | Princess Anne | 02/04/1994 | |
| (410) 652- | wireless | Bel Air | Cingular Wireless | 02/11/1995 |
| (410) 653- | landline | Pikesville | 02/04/1994 | |
| (410) 654- | landline | Pikesville | 09/11/1994 | |
| (410) 655- | landline | Randallstown | 02/04/1994 | |
| (410) 656- | landline | North East | Armstrong Telecom | 05/30/2008 |
| (410) 657- | landline | Baltimore | Mci Worldcom Comms | 01/10/1996 |
| (410) 658- | landline | Rising Sun | Armstrong Telco | 02/04/1994 |
| (410) 659- | landline | Baltimore | 02/04/1994 | |
| (410) 660- | wireless | Elkridge | Sprint | 07/31/2006 |
| (410) 661- | landline | Parkville | 02/04/1994 | |
| (410) 662- | landline | Baltimore | 02/11/1995 | |
| (410) 663- | landline | Parkville | 07/04/1995 | |
| (410) 664- | landline | Baltimore | 02/04/1994 | |
| (410) 665- | landline | Parkville | 02/04/1994 | |
| (410) 666- | landline | Cockeysville | 02/04/1994 | |
| (410) 667- | landline | Cockeysville | 02/04/1994 | |
| (410) 668- | landline | Parkville | 02/04/1994 | |
| (410) 669- | landline | Baltimore | 02/04/1994 | |
| (410) 670- | landline | Edgewood | Mci Worldcom Comms | 04/01/1997 |
| (410) 671- | landline | Edgewood | 02/04/1994 | |
| (410) 672- | landline | Odenton | 02/04/1994 | |
| (410) 673- | landline | Preston | 02/04/1994 | |
| (410) 674- | landline | Odenton | 02/04/1994 | |
| (410) 675- | landline | Baltimore | 02/04/1994 | |
| (410) 676- | landline | Edgewood | 02/04/1994 | |
| (410) 677- | landline | Salisbury | 02/04/1994 | |
| (410) 678- | wireless | Elkridge | USA Mobility Wireless | 02/04/1994 |
| (410) 679- | landline | Edgewood | 02/04/1994 | |
| (410) 680- | landline | Laurel | Tw Telecom | 01/25/1998 |
| (410) 681- | wireless | Towson | USA Mobility Wireless | 10/11/1997 |
| (410) 682- | landline | Essex | 02/04/1994 | |
| (410) 683- | landline | Cockeysville | 02/04/1994 | |
| (410) 684- | landline | Linthicum Heights | 02/04/1994 | |
| (410) 685- | landline | Baltimore | 02/04/1994 | |
| (410) 686- | landline | Essex | 02/04/1994 | |
| (410) 687- | landline | Essex | 02/04/1994 | |
| (410) 688- | wireless | Fallston | Verizon Wireless | 05/18/1998 |
| (410) 689- | landline | Baltimore | Teleport Comms America | 01/10/1996 |
| (410) 690- | landline | Wye Mills | AT&T; Local | 05/20/2002 |
| (410) 691- | landline | Linthicum Heights | 02/04/1994 | |
| (410) 692- | landline | Jarrettsville | 02/04/1994 | |
| (410) 693- | wireless | Annapolis | Cingular Wireless | 02/04/1994 |
| (410) 694- | landline | Linthicum Heights | 10/11/1997 | |
| (410) 695- | landline | Odenton | 04/15/1996 | |
| (410) 696- | landline | Baltimore | Mci Worldcom Comms | 04/01/1997 |
| (410) 697- | landline | Millersville | Mci Worldcom Comms | 04/01/1997 |
| (410) 698- | landline | Fork | Mci Worldcom Comms | 04/01/1997 |
| (410) 699- | wireless | Chestertown | Sprint | 07/23/2002 |
| (410) 701- | landline | Baltimore | Mci Worldcom Comms | 04/01/1997 |
| (410) 702- | landline | Reisterstown | Mci Worldcom Comms | 04/01/1997 |
| (410) 703- | wireless | Annapolis | Verizon Wireless | 02/04/1994 |
| (410) 704- | landline | Baltimore | Mci Worldcom Comms | 04/01/1997 |
| (410) 705- | landline | Beltsville | 07/01/1996 | |
| (410) 706- | landline | Baltimore | 02/04/1994 | |
| (410) 707- | wireless | Columbia | Verizon Wireless | 04/15/1996 |
| (410) 708- | wireless | Chestertown | Verizon Wireless | 02/04/1994 |
| (410) 709- | landline | Baltimore | Mci Worldcom Comms | 04/01/1997 |
| (410) 710- | wireless | Baltimore | Omnipoint Comms Cap Operations | 10/03/2005 |
| (410) 712- | landline | Elkridge | 02/04/1994 | |
| (410) 713- | landline | Salisbury | Level 3 Comms | 02/09/2003 |
| (410) 714- | wireless | Easton | Cingular Wireless | 07/04/1995 |
| (410) 715- | landline | Columbia | 02/04/1994 | |
| (410) 716- | landline | Towson | 02/04/1994 | |
| (410) 717- | landline | Laurel | Tw Telecom | 01/25/1998 |
| (410) 718- | wireless | Catonsville | Cingular Wireless | 10/15/1996 |
| (410) 719- | landline | Catonsville | 02/04/1994 | |
| (410) 720- | landline | Ellicott City | 02/04/1994 | |
| (410) 721- | landline | Crofton | 02/04/1994 | |
| (410) 722- | landline | Beltsville | 01/10/1996 | |
| (410) 723- | landline | Ocean City | 02/04/1994 | |
| (410) 724- | landline | Laurel | 07/04/1995 | |
| (410) 725- | wireless | Easton | Sprint | 04/01/1997 |
| (410) 726- | wireless | Salisbury | Verizon Wireless | 02/04/1994 |
| (410) 727- | landline | Baltimore | 02/04/1994 | |
| (410) 728- | landline | Baltimore | 02/04/1994 | |
| (410) 729- | landline | Severn | 01/10/1996 | |
| (410) 730- | landline | Columbia | 02/04/1994 | |
| (410) 731- | wireless | Annapolis | USA Mobility Wireless | 05/18/1998 |
| (410) 732- | landline | Baltimore | 02/04/1994 | |
| (410) 733- | wireless | Catonsville | Cingular Wireless | 02/04/1994 |
| (410) 734- | landline | Churchville | 02/04/1994 | |
| (410) 735- | landline | Baltimore | Cavalier Telephone Mid-atlantic | 07/06/1997 |
| (410) 736- | landline | Baltimore | 01/10/1996 | |
| (410) 737- | landline | Arbutus | 09/11/1994 | |
| (410) 738- | wireless | Beltsville | 01/10/1996 | |
| (410) 739- | wireless | Centreville | Cingular Wireless | 07/04/1995 |
| (410) 740- | landline | Columbia | 02/04/1994 | |
| (410) 741- | landline | North Beach | 02/04/1994 | |
| (410) 742- | landline | Salisbury | 02/04/1994 | |
| (410) 743- | wireless | Baltimore | USA Mobility Wireless | 07/04/1995 |
| (410) 744- | landline | Catonsville | 02/04/1994 | |
| (410) 745- | landline | Saint Michaels | 02/04/1994 | |
| (410) 746- | wireless | Baltimore | Verizon Wireless | 02/11/1995 |
| (410) 747- | landline | Catonsville | 02/04/1994 | |
| (410) 748- | landline | Ellicott City | USA Mobility Wireless | 02/04/1994 |
| (410) 749- | landline | Salisbury | 02/04/1994 | |
| (410) 750- | landline | Ellicott City | 02/04/1994 | |
| (410) 751- | landline | Westminster | 02/04/1994 | |
| (410) 752- | landline | Baltimore | 02/04/1994 | |
| (410) 753- | landline | Baltimore | Mci Worldcom Comms | 01/10/1996 |
| (410) 754- | landline | Federalsburg | 02/04/1994 | |
| (410) 755- | landline | Warwick | 02/04/1994 | |
| (410) 756- | landline | Taneytown | 02/04/1994 | |
| (410) 757- | landline | Annapolis | 02/04/1994 | |
| (410) 758- | landline | Centreville | 02/04/1994 | |
| (410) 759- | wireless | Baltimore | 02/04/1994 | |
| (410) 760- | landline | Glen Burnie | 02/04/1994 | |
| (410) 761- | landline | Glen Burnie | 02/04/1994 | |
| (410) 762- | landline | Glen Burnie | 01/10/1996 | |
| (410) 763- | landline | Easton | 02/11/1995 | |
| (410) 764- | landline | Baltimore | 02/04/1994 | |
| (410) 765- | landline | Linthicum Heights | 02/04/1994 | |
| (410) 766- | landline | Glen Burnie | 02/04/1994 | |
| (410) 767- | landline | Baltimore | 02/04/1994 | |
| (410) 768- | landline | Glen Burnie | 02/04/1994 | |
| (410) 769- | landline | Towson | 02/11/1995 | |
| (410) 770- | landline | Easton | 10/11/1997 | |
| (410) 771- | landline | Cockeysville | 02/04/1994 | |
| (410) 772- | landline | Columbia | 01/11/1997 | |
| (410) 773- | landline | Cockeysville | 04/01/1997 | |
| (410) 774- | landline | Crofton | Mci Worldcom Comms | 05/18/1998 |
| (410) 775- | landline | Union Bridge | 02/04/1994 | |
| (410) 776- | landline | Bel Air | Teleport Comms America | 04/01/1997 |
| (410) 777- | landline | Severna Park | Mci Worldcom Comms | 04/01/1997 |
| (410) 778- | landline | Chestertown | 02/04/1994 | |
| (410) 779- | landline | Baltimore | Level 3 Comms | 05/18/1998 |
| (410) 780- | landline | Essex | 02/04/1994 | |
| (410) 781- | landline | Sykesville | 02/04/1994 | |
| (410) 782- | landline | Elkridge | 04/15/1996 | |
| (410) 783- | landline | Baltimore | 02/04/1994 | |
| (410) 784- | landline | Deal Island | 02/04/1994 | |
| (410) 785- | landline | Cockeysville | 02/04/1994 | |
| (410) 786- | landline | Woodlawn | 02/11/1995 | |
| (410) 787- | landline | Glen Burnie | 02/04/1994 | |
| (410) 788- | landline | Catonsville | 02/04/1994 | |
| (410) 789- | landline | Brooklyn | 02/04/1994 | |
| (410) 790- | wireless | Towson | Cingular Wireless | 02/04/1994 |
| (410) 791- | wireless | Beltsville | 01/10/1996 | |
| (410) 792- | landline | Laurel | 02/04/1994 | |
| (410) 793- | landline | Crofton | 02/04/1994 | |
| (410) 794- | landline | Laurel | Tw Telecom | 07/06/1997 |
| (410) 795- | landline | Sykesville | 02/04/1994 | |
| (410) 796- | landline | Elkridge | 02/04/1994 | |
| (410) 797- | landline | Laurel | 02/04/1994 | |
| (410) 798- | landline | Edgewater | 02/04/1994 | |
| (410) 799- | landline | Elkridge | 02/04/1994 | |
| (410) 800- | landline | Baltimore | Verizon Wireless | 10/05/2004 |
| (410) 801- | wireless | Baltimore | 02/04/1994 | |
| (410) 802- | wireless | Catonsville | Cingular Wireless | 02/04/1994 |
| (410) 803- | landline | Bel Air | 07/01/1996 | |
| (410) 804- | wireless | Baltimore | Verizon Wireless | 02/04/1994 |
| (410) 805- | wireless | Towson | Sprint | 08/25/2011 |
| (410) 806- | wireless | Towson | USA Mobility Wireless | 02/04/1994 |
| (410) 807- | landline | Laurel | Tw Telecom | 01/25/1998 |
| (410) 808- | wireless | Fallston | Sprint | 01/25/1998 |
| (410) 809- | landline | Bel Air | Cavalier Telephone (mid-atlantic) | 08/14/1998 |
| (410) 810- | landline | Chestertown | 02/04/1994 | |
| (410) 812- | wireless | Towson | Cingular Wireless | 02/04/1994 |
| (410) 813- | landline | Beltsville | 02/04/1994 | |
| (410) 814- | landline | Baltimore | Cavalier Telephone Mid-atlantic | 09/30/2005 |
| (410) 815- | wireless | Beltsville | 07/01/1996 | |
| (410) 816- | wireless | Towson | 04/15/1996 | |
| (410) 817- | landline | Fork | 02/11/1995 | |
| (410) 818- | landline | Baltimore | Teleport Comms America | 01/10/1996 |
| (410) 819- | landline | Easton | 02/04/1994 | |
| (410) 820- | landline | Easton | 02/04/1994 | |
| (410) 821- | landline | Towson | 02/04/1994 | |
| (410) 822- | landline | Easton | 02/04/1994 | |
| (410) 823- | landline | Towson | 02/04/1994 | |
| (410) 824- | landline | Laurel | Tw Telecom | 07/04/1995 |
| (410) 825- | landline | Towson | 02/04/1994 | |
| (410) 826- | wireless | Glen Burnie | 02/11/1995 | |
| (410) 827- | landline | Queenstown | 02/04/1994 | |
| (410) 828- | landline | Towson | 02/04/1994 | |
| (410) 829- | wireless | Easton | Verizon Wireless | 07/04/1995 |
| (410) 830- | landline | Towson | 02/04/1994 | |
| (410) 831- | wireless | Salisbury | Halo Wireless Services | 12/02/2011 |
| (410) 832- | landline | Towson | 02/04/1994 | |
| (410) 833- | landline | Reisterstown | 02/04/1994 | |
| (410) 834- | landline | Laurel | 01/10/1996 | |
| (410) 835- | landline | Willards | 02/04/1994 | |
| (410) 836- | landline | Bel Air | 02/04/1994 | |
| (410) 837- | landline | Baltimore | 02/04/1994 | |
| (410) 838- | landline | Bel Air | 02/04/1994 | |
| (410) 839- | wireless | Towson | USA Mobility Wireless | 01/10/1996 |
| (410) 840- | landline | Westminster | 02/04/1994 | |
| (410) 841- | landline | Annapolis | 02/04/1994 | |
| (410) 842- | landline | Baltimore | Mci Worldcom Comms | 01/10/1996 |
| (410) 843- | landline | Baltimore | Teleport Comms America | 04/15/1996 |
| (410) 844- | landline | Baltimore | Peerless Network | 09/30/2011 |
| (410) 845- | wireless | Salisbury | Sprint | 04/18/2001 |
| (410) 846- | landline | Baltimore | Mci Worldcom Comms | 04/01/1997 |
| (410) 847- | landline | Towson | 10/15/1996 | |
| (410) 848- | landline | Westminster | 02/04/1994 | |
| (410) 849- | landline | Sherwood Forest | 02/04/1994 | |
| (410) 850- | landline | Linthicum Heights | 02/04/1994 | |
| (410) 851- | wireless | Towson | 10/11/1997 | |
| (410) 852- | wireless | Catonsville | Cingular Wireless | 01/25/1998 |
| (410) 853- | landline | Towson | 04/01/1997 | |
| (410) 854- | landline | Odenton | 11/20/1998 | |
| (410) 855- | landline | Linthicum Heights | 07/04/1995 | |
| (410) 856- | landline | Cockeysville | 02/11/1995 | |
| (410) 857- | landline | Westminster | 02/04/1994 | |
| (410) 858- | landline | Annapolis | 03/11/2005 | |
| (410) 859- | landline | Linthicum Heights | 02/04/1994 | |
| (410) 860- | landline | Salisbury | 02/04/1994 | |
| (410) 861- | landline | Reisterstown | 02/04/1994 | |
| (410) 862- | landline | Laurel | 02/11/1995 | |
| (410) 863- | landline | Glen Burnie | 02/11/1995 | |
| (410) 864- | landline | Baltimore | Mci Worldcom Comms | 07/04/1995 |
| (410) 865- | landline | Linthicum Heights | 07/01/1996 | |
| (410) 866- | landline | Baltimore | 02/04/1994 | |
| (410) 867- | landline | West River | 02/04/1994 | |
| (410) 868- | wireless | Catonsville | Cingular Wireless | 02/11/1995 |
| (410) 869- | landline | Catonsville | 10/15/1996 | |
| (410) 870- | landline | Parkville | Comcast Phone Of Northern Maryland | 02/10/2005 |
| (410) 871- | landline | Westminster | 01/11/1997 | |
| (410) 872- | landline | Columbia | 02/11/1995 | |
| (410) 873- | landline | Nanticoke | 02/04/1994 | |
| (410) 874- | landline | Odenton | Mci Worldcom Comms | 04/01/1997 |
| (410) 875- | landline | Westminster | 02/04/1994 | |
| (410) 876- | landline | Westminster | 02/04/1994 | |
| (410) 877- | landline | Fallston | 02/04/1994 | |
| (410) 878- | landline | Baltimore | Mci Worldcom Comms | 05/18/1998 |
| (410) 879- | landline | Bel Air | 02/04/1994 | |
| (410) 880- | landline | Laurel | 02/04/1994 | |
| (410) 881- | landline | Sherwood Forest | Mci Worldcom Comms | 04/01/1997 |
| (410) 882- | landline | Parkville | 02/04/1994 | |
| (410) 883- | landline | Rhodesdale | 02/04/1994 | |
| (410) 884- | landline | Columbia | 01/10/1996 | |
| (410) 885- | landline | Chesapeake City | 02/04/1994 | |
| (410) 886- | landline | Tilghman | 02/04/1994 | |
| (410) 887- | landline | Towson | 02/04/1994 | |
| (410) 888- | landline | Laurel | 01/25/1998 | |
| (410) 889- | landline | Baltimore | 02/04/1994 | |
| (410) 890- | wireless | Towson | USA Mobility Wireless | 10/11/1997 |
| (410) 891- | landline | Baltimore | Mci Worldcom Comms | 01/10/1996 |
| (410) 892- | wireless | Linthicum Heights | 02/04/1994 | |
| (410) 893- | landline | Bel Air | 02/04/1994 | |
| (410) 894- | wireless | Towson | USA Mobility Wireless | 09/11/1994 |
| (410) 895- | landline | Baltimore | 02/11/1995 | |
| (410) 896- | landline | Delmar | 02/04/1994 | |
| (410) 897- | landline | Annapolis | 07/06/1997 | |
| (410) 898- | landline | Beltsville | 02/04/1994 | |
| (410) 899- | wireless | Towson | USA Mobility Wireless | 10/11/1997 |
| (410) 900- | landline | Baltimore | Ctc Comms Corp. | 10/04/2004 |
| (410) 901- | landline | Cambridge | 10/15/1996 | |
| (410) 902- | landline | Pikesville | 10/15/1996 | |
| (410) 903- | wireless | Baltimore | Sprint | 10/15/1996 |
| (410) 904- | landline | Baltimore | Mci Worldcom Comms | 07/01/1996 |
| (410) 905- | wireless | Baltimore | Sprint | 04/15/1996 |
| (410) 906- | landline | Baltimore | 02/04/1994 | |
| (410) 907- | landline | Baltimore | Mci Worldcom Comms | 07/01/1996 |
| (410) 908- | wireless | Baltimore | Sprint | 07/01/1996 |
| (410) 909- | wireless | Elkridge | USA Mobility Wireless | 02/04/1994 |
| (410) 910- | landline | Baltimore | Mci Worldcom Comms | 07/01/1996 |
| (410) 912- | landline | Salisbury | Cavalier Telephone (mid-atlantic) | 08/14/1998 |
| (410) 913- | wireless | Baltimore | Verizon Wireless | 04/15/1996 |
| (410) 914- | landline | Churchville | Cavalier Telephone (mid-atlantic) | 08/14/1998 |
| (410) 915- | landline | Baltimore | Baltimore-washington Telephone (bwt) | 10/27/2005 |
| (410) 916- | wireless | Baltimore | Verizon Wireless | 04/01/1997 |
| (410) 917- | wireless | Catonsville | Cingular Wireless | 02/04/1994 |
| (410) 918- | landline | Essex | 10/15/1996 | |
| (410) 919- | landline | Annapolis | Mci Worldcom Comms | 07/01/1996 |
| (410) 920- | wireless | Elkton | Cingular Wireless | 02/04/1994 |
| (410) 921- | landline | Laurel | Tw Telecom | 01/25/1998 |
| (410) 922- | landline | Randallstown | 02/04/1994 | |
| (410) 923- | landline | Millersville | 02/04/1994 | |
| (410) 924- | wireless | Easton | Verizon Wireless | 02/11/1995 |
| (410) 925- | wireless | Baltimore | Verizon Wireless | 04/15/1996 |
| (410) 926- | wireless | Catonsville | Cingular Wireless | 10/11/1997 |
| (410) 927- | landline | Laurel | Tw Telecom | 01/25/1998 |
| (410) 928- | landline | Millington | 02/04/1994 | |
| (410) 929- | landline | Baltimore | Bandwidth.com | 05/13/2008 |
| (410) 930- | wireless | Baltimore | Redi-call Comms Co | 01/25/1998 |
| (410) 931- | landline | Parkville | 02/04/1994 | |
| (410) 932- | wireless | Elkridge | USA Mobility Wireless | 04/01/1997 |
| (410) 933- | landline | Parkville | 09/11/1994 | |
| (410) 934- | wireless | Annapolis | Cingular Wireless | 01/27/2012 |
| (410) 935- | wireless | Baltimore | Verizon Wireless | 04/15/1996 |
| (410) 937- | wireless | Fallston | Verizon Wireless | 04/15/1996 |
| (410) 938- | landline | Towson | 02/04/1994 | |
| (410) 939- | landline | Havre De Grace | 02/04/1994 | |
| (410) 940- | landline | Annapolis | Atx Telecom Services, Ltd | 01/22/2002 |
| (410) 941- | landline | Jarrettsville | 08/21/2001 | |
| (410) 942- | landline | Havre De Grace | 10/11/1997 | |
| (410) 943- | landline | Hurlock | 02/04/1994 | |
| (410) 944- | landline | Woodlawn | 02/04/1994 | |
| (410) 945- | landline | Baltimore | 02/04/1994 | |
| (410) 946- | landline | Annapolis | 11/20/1998 | |
| (410) 947- | landline | Baltimore | 02/04/1994 | |
| (410) 948- | wireless | Catonsville | Cingular Wireless | 05/18/1998 |
| (410) 949- | landline | Baltimore | Mci Worldcom Comms | 05/18/1998 |
| (410) 951- | landline | Baltimore | Teleport Comms America | 10/15/1996 |
| (410) 952- | wireless | Baltimore | Verizon Wireless | 07/04/1995 |
| (410) 953- | landline | Columbia | 08/14/1998 | |
| (410) 955- | landline | Baltimore | 02/04/1994 | |
| (410) 956- | landline | Annapolis | 02/04/1994 | |
| (410) 957- | landline | Pocomoke | 02/04/1994 | |
| (410) 960- | wireless | Baltimore | Verizon Wireless | 02/04/1994 |
| (410) 961- | wireless | Baltimore | Sprint | 01/25/1998 |
| (410) 962- | landline | Baltimore | 02/04/1994 | |
| (410) 963- | wireless | Baltimore | Sprint | 01/25/1998 |
| (410) 964- | landline | Columbia | 02/04/1994 | |
| (410) 965- | landline | Woodlawn | 02/04/1994 | |
| (410) 966- | landline | Woodlawn | 02/04/1994 | |
| (410) 967- | wireless | Towson | Cingular Wireless | 05/18/1998 |
| (410) 968- | landline | Crisfield | 02/04/1994 | |
| (410) 969- | landline | Severn | 02/04/1994 | |
| (410) 970- | landline | Sykesville | Mci Worldcom Comms | 05/18/1998 |
| (410) 971- | wireless | Catonsville | Cingular Wireless | 02/04/1994 |
| (410) 972- | landline | Annapolis | Teleport Comms America | 01/25/1998 |
| (410) 973- | landline | Berlin | Mcc Telephony Of The Mid-atlantic | 06/23/2010 |
| (410) 974- | landline | Arnold | 02/04/1994 | |
| (410) 975- | landline | Severna Park | 05/18/1998 | |
| (410) 976- | Baltimore-washington Telephone (bwt) | 10/13/2005 | ||
| (410) 977- | wireless | Baltimore | Sprint | 01/25/1998 |
| (410) 978- | wireless | Catonsville | Cingular Wireless | 02/04/1994 |
| (410) 979- | wireless | Catonsville | Cingular Wireless | 02/04/1994 |
| (410) 980- | landline | Annapolis | Verizon Wireless | 05/18/1998 |
| (410) 981- | landline | Linthicum Heights | 02/27/1999 | |
| (410) 982- | landline | Baltimore | Quantum Telecom | 10/13/2003 |
| (410) 983- | landline | Fork | 01/25/1998 | |
| (410) 984- | wireless | Sykesville | Sprint | 01/25/1998 |
| (410) 985- | landline | Jessup | Baltimore-washington Telephone (bwt) | 02/13/2002 |
| (410) 986- | landline | Baltimore | 01/10/1996 | |
| (410) 987- | landline | Severn | 02/04/1994 | |
| (410) 988- | landline | Columbia | 02/04/1994 | |
| (410) 989- | landline | Churchville | 01/25/1998 | |
| (410) 990- | landline | Annapolis | 01/25/1998 | |
| (410) 991- | wireless | Annapolis | Verizon Wireless | 02/04/1994 |
| (410) 992- | landline | Columbia | 02/04/1994 | |
| (410) 993- | landline | Linthicum Heights | 02/04/1994 | |
| (410) 994- | landline | Aberdeen | 02/11/1995 | |
| (410) 995- | landline | Ellicott City | 02/04/1994 | |
| (410) 996- | landline | Port Deposit | 02/04/1994 | |
| (410) 997- | landline | Columbia | 02/04/1994 | |
| (410) 998- | landline | Pikesville | 02/04/1994 | |
| (410) 999- | landline | Baltimore | Baltimore-washington Telephone (bwt) | 06/09/2003 |