Maryland Area Code

Maryland area codes are numeric identifiers used for telephone numbering within the state. Major ones include 240/301 for the west and south, and 410/443/667 for the east, including Baltimore. They help organize and manage phone numbers efficiently.

State Maryland
State Abbreviation: MD
State Nickname: Old Line State Equality State
Capital City Annapolis
Area Codes 240, 301, 410, 443
Timezone Eastern Time (ET)
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What time zone is Maryland?

Maryland is primarily in the Eastern Time Zone (ET) in the United States. Eastern Time is UTC-5 during Standard Time (EST) and UTC-4 during Daylight Saving Time (EDT), which is observed from the second Sunday in March to the first Sunday in November. Maryland follows these time zone offsets along with the majority of the Eastern United States.

Note that the start and end dates of daylight saving time can change


Maryland's area code history reflects the state's changing telecommunications landscape. Originally, Maryland had a single area code, 301, which served the entire state. As the population grew and telephone usage increased, additional area codes were introduced. Area Code 410 was established to accommodate eastern Maryland, including Baltimore, and was later overlaid by Area Code 443, followed by Area Code 667. The western and southern regions received Area Code 240 as an overlay for the existing 301. These adjustments have enabled Maryland to meet the demand for phone numbers efficiently and adapt to the evolving telecommunications needs of its residents and businesses.

All Area Codes in Maryland

This table provides a quick overview of all area codes, their locations, and some historical context for each.

Area Code Location History and Details
240 Western and Southern Maryland Covers parts of western and southern Maryland, including cities like Frederick and Hagerstown.
301 Western and Southern Maryland Covers western and southern Maryland, including cities like Rockville and Cumberland.
410 Eastern Maryland Covers the eastern part of Maryland, including Baltimore.
443 Eastern Maryland Overlay code for Area Code 410, serving the same region.
667 Eastern Maryland Overlay code for Area Codes 410 and 443, serving the same region.

Largest Cities in Maryland with area codes

Quick overview of large cities, their area codes, and some historical context for each in Maryland.

Name Area Code History and Details
Baltimore 410, 443, 667 Maryland's largest city, known for its historic charm and cultural attractions.
Columbia 410 A planned community between Baltimore and Washington, D.C., recognized for its diverse neighborhoods.
Germantown 301 A rapidly growing city in the Washington, D.C. metropolitan area.
Silver Spring 301 A major suburb of Washington, D.C., known for its cultural diversity and vibrant downtown.
Frederick 240, 301 A historic city in western Maryland with a charming downtown and cultural heritage.
Rockville 240, 301 A city in Montgomery County, part of the Washington, D.C. metro area, known for its thriving communities.
Gaithersburg 240, 301 A city in Montgomery County with diverse neighborhoods and economic development.
Annapolis 410 The capital of Maryland, located on the Chesapeake Bay, known for its historic significance.
Laurel 301 A city in Prince George's County, situated between Baltimore and Washington, D.C.
Bowie 301 A city in Prince George's County known for its suburban character and parks.