What is an Area Code? An area code is a section of a telephone number that denotes the broad area that the phone receiving the call is based in. Area codes were first introduced circa 1947 for operator use only. Area codes are three-digit numbers that represent Numbering Plan Areas (NPAs). The area code for a particular city or region is the series of numbers that you have to dial before someone’s number if you are making a phone call to that place from a different area. Area code 240 serves the state of Maryland.
The Table Below Shows the Towns and Cities That Use Area Code 240
| Andrews Air Force Base Annapolis Ashton Bel Alton Bethesda Bowie Brandywine Brentwood Brunswick Bryans Road California Callaway Cascade Cheltenham Chevy Chase Clarksburg Clinton College Park Columbia Crofton Cumberland Damascus Derwood | District Heights Elkridge Emmitsburg Faulkner Fort Washington Frederick Frostburg Gaithersburg Germantown Grantsville Great Mills Greenbelt Hagerstown Halethorpe Hancock Hughesville Hyattsville Ijamsville Indian Head Issue Jessup Kensington La Plata | Lanham Laurel Leonardtown Lexington Park Libertytown Lothian Mechanicsville Middletown Monrovia Montgomery Village Mount Airy Mount Rainier Myersville Nanjemoy New Market Oakland Odenton Oxon Hill Patuxent River Poolesville Port Tobacco Potomac Prince Frederick | Rawlings Ridge Riverdale Rockville Sabillasville Sandy Spring Savage Shady Side Silver Spring Smithsburg Suitland Takoma Park Temple Hills Thurmont Upper Marlboro Waldorf Walkersville Westernport Williamsport Woodsboro |