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  5. Area Code 301

Where Is Area Code 301?

Area code 301 is found in the US state of Maryland. Primarily servicing the city of Silver Spring (population: 291576), area code 301 covers 12 counties of Maryland.

Located in the Eastern time zone, area code 301 is on the same time as New York, NY.

Area code 301 was brought into effect on January 1, 1947.

Map of  with area code 301 highlighted

Counties in Area Code 301

  • Allegany,
  • Anne Arundel,
  • Calvert,
  • Charles,
  • Frederick,
  • Garrett,
  • Howard,
  • Montgomery,
  • Prince Georges,
  • Saint Marys,
  • Washington.

Most Populous Cities in Area Code 301

City County City Population Time Zone
Silver Spring Montgomery 291,576 EST
Hyattsville Prince Georges 154,084 EST
Gaithersburg Montgomery 139,916 EST
Rockville Montgomery 134,991 EST
Frederick Frederick 123,516 EST
Bowie Prince Georges 97,168 EST
Hagerstown Washington 96,315 EST
Upper Marlboro Prince Georges 87,394 EST
Germantown Montgomery 85,671 EST
Bethesda Montgomery 82,803 EST
Waldorf Charles 80,228 EST
Laurel Prince Georges 58,259 EST
Fort Washington Prince Georges 51,762 EST
Potomac Montgomery 51,292 EST
Cumberland Allegany 43,764 EST
District Heights Prince Georges 40,875 EST
Temple Hills Prince Georges 39,588 EST
Lanham Prince Georges 39,485 EST
Capitol Heights Prince Georges 39,413 EST
College Park Prince Georges 37,338 EST
Clinton Prince Georges 36,147 EST
Montgomery Village Montgomery 34,409 EST
Laurel Howard 30,217 EST
Mount Airy Frederick 30,071 EST
Chevy Chase Montgomery 30,067 EST

Note: The above list is based off of the top 25 most populous cities in the area code as per 2012 United States Census Bureau estimates.

View all United States Area Codes.

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This page was last updated on July 3, 2015.