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North American telephone area codes in Maryland
Area codes 301, 240, and 227 are telephone area codes in the North American Numbering Plan for the western part of the U.S. state of Maryland. The numbering plan area (NPA) comprises Maryland's portion of the Greater Washington, D.C. metro area, portions of southern Maryland, along with rural western Maryland. This includes the communities of Cumberland, Frederick, Hagerstown, Gaithersburg, Potoma... Wikipedia