Area Code 240

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