240
Maryland (MD)
By Area Code
By State
All
200
300
400
500
600
700
800
900
Cities Covered by
240
Area Code
Bethesda
Brentwood
Brunswick
California
Callaway
Cheltenham
Chevy Chase
Clinton
Columbia
Crofton
Cumberland
Derwood
Faulkner
Frederick
Gaithersburg
Grantsville
Great Mills
Hagerstown
Hyattsville
Indian Head
Issue
Kensington
La Plata
Lanham
Lexington Park
Libertytown
Middletown
Montgomery Village
Mount Airy
Myersville
Nanjemoy
Oakland
Oxon Hill
Patuxent River
Poolesville
Port Tobacco
Potomac
Ridge
Rockville
Sandy Spring
Savage
Shady Side
Silver Spring
Smithsburg
Takoma Park
Waldorf
Andrews Air Force Base
Annapolis
Ashton
Bel Alton
Bowie
Brandywine
Bryans Road
Cascade
Clarksburg
College Park
Damascus
District Heights
Elkridge
Emmitsburg
Fort Washington
Frostburg
Germantown
Greenbelt
Halethorpe
Hancock
Hughesville
Ijamsville
Jessup
Laurel
Leonardtown
Lothian
Mechanicsville
Monrovia
Mount Rainier
New Market
Odenton
Prince Frederick
Rawlings
Riverdale
Sabillasville
Suitland
Temple Hills
Thurmont
Upper Marlboro
Walkersville
Westernport
Williamsport
Woodsboro
Related Area Codes
202
,
240
,
301
,
410
,
443
,
703
,
304