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The state of Maryland is served by the following area codes: ... Numbering plan area 227 240 301: western Maryland, including its suburbs of Washington, D.C. 410 443 667:
Code Territory or use Date Notes 300: not in use; available for non-geographic assignment easily recognizable code (ERC) 301: Maryland (Silver Spring; Washington, D.C., suburbs; all counties which touch the Potomac River; Waldorf, Hagerstown, Frederick, Rockville, Cumberland; and land line telephones in western Maryland)
Area code 301 was the first area code for all of Maryland, from 1947, when the area code system was created, until 1991, when everything from Baltimore eastward split off as area code 410. In 1997, area code 240 was added as an overlay area code for the 301 territory. On June 14, 2023, a third overlay code, 227, was added to provide more ...
The three area codes are overlay codes for one numbering plan area, among which 410 was the initial area code for the NPA, when it was split from area code 301 in 1991. 443 and 667 found assignment primarily in cellular service and for competitive local exchange carriers, such as Comcast and Cavalier Telephone, when introduced, but have since ...
ZIP Codes: 21701–21709. Area codes: 301, 240: FIPS code: 24-30325: GNIS feature ID: 2390588 [4] Highways: ... Frederick became Maryland's capital city briefly in ...
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List of Maryland area codes; 0–9. Area codes 301, 240, and 227; Area codes 410, 443, and 667
Area code 540 was established on July 15, 1995, when numbering plan area 703 was divided. The independent cities of Alexandria, Fairfax, Falls Church, Manassas, and Manassas Park and the counties of Arlington, Fairfax, (Eastern) Loudon County and Prince William along with a very small portion of Fauquier County and Stafford County remained in the area code 703, while the rest of the area was ...
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