Area codes 240 and 301

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The blue area is Maryland; the red area is area codes 240 and 301

North American area codes 240 and 301 are state of Maryland telephone area codes which serve Maryland's portion of the Greater Washington, D.C. metro area, portions of Southern Maryland, and all points northwest of Washington. This includes the communities of Cumberland, Frederick, Hagerstown, and Rockville. Area code 301 was one of the original area codes established in 1947, and was the exclusive area code for the entire state of Maryland until it was split with 410 on October 6, 1991. The overlay area code, 240, was introduced on June 1, 1997.

Counties served by these area codes include:

local calls require 10-digit dialing (area code + number, leading "1" is not required)


State of Maryland Area Codes: 240, 301, 410, 443
North: 717, 724/878, 814
West: 202, 304, 540, 571/703 area codes 301/240 East: 410/443
South: 804
District of Columbia Area Code: 202
Commonwealth of Pennsylvania Area Codes: 215, 267, 412, 484, 570, 610, 717, 724, 814, 835, 878
Commonwealth of Virginia Area Codes: 276, 434, 540, 571/703, 757, 804
State of West Virginia Area Code: 304


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