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Area code 240 is an area code that covers Western Maryland, specifically the part of Maryland that is included in the Washington DC metro area. Area code 240 overlays the area code of 301.Where is telephone area code 240?
North American area codes 240 and 301 are telephone area codes for the western half of Maryland. They serve Maryland's portion of the Greater Washington, D.C., metro area, portions of southern Maryland, and the more rural areas in the western portion of the state.Where is area code 240?
Area Code 240 is in Maryland and covers 4146.61 square miles. Area Code 240 contains 283 non-unique postal area zip codes.