240 area code is a telephone area code in the North American Numbering Plan (NANP) for western part of Maryland, United States. The area code was created in 1997.
| Area Code | 240 |
|---|---|
| Major City | Germantown |
| Service Date | 06/01/1997 |
| Time Zone | Eastern |
| Overlay Complex | 227/240/301 |
| Location | Maryland (MD) |
| Country | United States |
Some of the cities served by area code 240 include Germantown, Silver Spring, Waldorf, Frederick, Rockville, Bethesda, Gaithersburg, Bowie and Aspen Hill.
| Area code | City/Town | County |
|---|---|---|
| 240 | Abell | St Marys |
| 240 | Accident | Garrett |
| 240 | Accokeek | Prince George's |
| 240 | Adamstown | Frederick |
| 240 | Andrews Afb | Prince George's |
| 240 | Aquasco | Prince George's |
| 240 | Ashton | Montgomery |
| 240 | Avenue | St Marys |
| 240 | Barnesville | Montgomery |
| 240 | Barton | Allegany |
| 240 | Beallsville | Montgomery |
| 240 | Bel Alton | Charles |
| 240 | Beltsville | Prince George's |
| 240 | Benedict | Charles |
| 240 | Bethesda | Montgomery |
| 240 | Big Pool | Washington |
| 240 | Bittinger | Garrett |
| 240 | Bladensburg | Prince George's |
| 240 | Bloomington | Garrett |
| 240 | Boonsboro | Washington |
| 240 | Bowie | Prince George's |
| 240 | Boyds | Montgomery |
| 240 | Braddock Heights | Frederick |
| 240 | Brandywine | Prince George's |
| 240 | Brentwood | Prince George's |
| 240 | Brinklow | Montgomery |
| 240 | Brookeville | Montgomery |
| 240 | Brownsville | Washington |
| 240 | Brunswick | Frederick |
| 240 | Bryans Road | Charles |
| 240 | Bryantown | Charles |
| 240 | Buckeystown | Frederick |
| 240 | Burkittsville | Frederick |
| 240 | Burtonsville | Montgomery |
| 240 | Bushwood | St Marys |
| 240 | Cabin John | Montgomery |
| 240 | California | St Marys |
| 240 | Callaway | St Marys |
| 240 | Capitol Heights | Prince George's |
| 240 | Cascade | Washington |
| 240 | Cavetown | Washington |
| 240 | Chaptico | St Marys |
| 240 | Charlotte Hall | St Marys |
| 240 | Cheltenham | Prince George's |
| 240 | Chevy Chase | Montgomery |
| 240 | Chewsville | Washington |
| 240 | Clarksburg | Montgomery |
| 240 | Clear Spring | Washington |
| 240 | Clements | St Marys |
| 240 | Clinton | Prince George's |
| 240 | Cobb Island | Charles |
| 240 | College Park | Prince George's |
| 240 | Coltons Point | St Marys |
| 240 | Compton | St Marys |
| 240 | Corriganville | Allegany |
| 240 | Cumberland | Allegany |
| 240 | Damascus | Montgomery |
| 240 | Dameron | St Marys |
| 240 | Derwood | Montgomery |
| 240 | Dickerson | Montgomery |
| 240 | District Heights | Prince George's |
| 240 | Drayden | St Marys |
| 240 | Eckhart Mines | Allegany |
| 240 | Ellerslie | Allegany |
| 240 | Emmitsburg | Frederick |
| 240 | Fairplay | Washington |
| 240 | Faulkner | Charles |
| 240 | Flintstone | Allegany |
| 240 | Fort Washington | Prince George's |
| 240 | Frederick | Frederick |
| 240 | Friendship | Anne Arundel |
| 240 | Friendsville | Garrett |
| 240 | Frostburg | Allegany |
| 240 | Funkstown | Washington |
| 240 | Gaithersburg | Montgomery |
| 240 | Garrett Park | Montgomery |
| 240 | Germantown | Montgomery |
| 240 | Glen Echo | Montgomery |
| 240 | Glenn Dale | Prince George's |
| 240 | Grantsville | Garrett |
| 240 | Great Mills | St Marys |
| 240 | Greenbelt | Prince George's |
| 240 | Hagerstown | Washington |
| 240 | Hancock | Washington |
| 240 | Helen | St Marys |
| 240 | Highland | Howard |
| 240 | Hollywood | St Marys |
| 240 | Hughesville | Charles |
| 240 | Hyattsville | Prince George's |
| 240 | Ijamsville | Frederick |
| 240 | Indian Head | Charles |
| 240 | Ironsides | Charles |
| 240 | Issue | Charles |
| 240 | Jefferson | Frederick |
| 240 | Keedysville | Washington |
| 240 | Kensington | Montgomery |
| 240 | Kitzmiller | Garrett |
| 240 | Knoxville | Frederick |
| 240 | La Plata | Charles |
| 240 | Ladiesburg | Frederick |
| 240 | Lanham | Prince George's |
| 240 | Laurel | Anne Arundel |
| 240 | Leonardtown | St Marys |
| 240 | Lexington Park | St Marys |
| 240 | Libertytown | Frederick |
| 240 | Little Orleans | Allegany |
| 240 | Lonaconing | Allegany |
| 240 | Loveville | St Marys |
| 240 | Luke | Allegany |
| 240 | Marbury | Charles |
| 240 | Maugansville | Washington |
| 240 | Mc Henry | Garrett |
| 240 | Mechanicsville | St Marys |
| 240 | Middletown | Frederick |
| 240 | Midland | Allegany |
| 240 | Midlothian | Allegany |
| 240 | Monrovia | Frederick |
| 240 | Montgomery Village | Montgomery |
| 240 | Morganza | St Marys |
| 240 | Mount Airy | Frederick |
| 240 | Mount Rainier | Prince George's |
| 240 | Mount Savage | Allegany |
| 240 | Mount Victoria | Charles |
| 240 | Myersville | Frederick |
| 240 | Nanjemoy | Charles |
| 240 | New Market | Frederick |
| 240 | New Midway | Frederick |
| 240 | Newburg | Charles |
| 240 | Oakland | Garrett |
| 240 | Oldtown | Allegany |
| 240 | Olney | Montgomery |
| 240 | Owings | Calvert |
| 240 | Oxon Hill | Prince George's |
| 240 | Park Hall | St Marys |
| 240 | Patuxent River | St Marys |
| 240 | Piney Point | St Marys |
| 240 | Pinto | Allegany |
| 240 | Point Of Rocks | Frederick |
| 240 | Pomfret | Charles |
| 240 | Poolesville | Montgomery |
| 240 | Port Tobacco | Charles |
| 240 | Potomac | Montgomery |
| 240 | Rawlings | Allegany |
| 240 | Ridge | St Marys |
| 240 | Riverdale | Prince George's |
| 240 | Rock Point | Charles |
| 240 | Rockville | Montgomery |
| 240 | Rocky Ridge | Frederick |
| 240 | Rohrersville | Washington |
| 240 | Sabillasville | Frederick |
| 240 | Sandy Spring | Montgomery |
| 240 | Scotland | St Marys |
| 240 | Sharpsburg | Washington |
| 240 | Silver Spring | Montgomery |
| 240 | Smithsburg | Washington |
| 240 | Southern MD Facility | Prince George's |
| 240 | Spencerville | Montgomery |
| 240 | Spring Gap | Allegany |
| 240 | St Inigoes | St Marys |
| 240 | St James | Washington |
| 240 | St Marys City | St Marys |
| 240 | Suburb Maryland Fac | Montgomery |
| 240 | Suitland | Prince George's |
| 240 | Swanton | Garrett |
| 240 | Takoma Park | Montgomery |
| 240 | Tall Timbers | St Marys |
| 240 | Temple Hills | Prince George's |
| 240 | Thurmont | Frederick |
| 240 | Tuscarora | Frederick |
| 240 | Unionville | Frederick |
| 240 | Upper Marlboro | Prince George's |
| 240 | Valley Lee | St Marys |
| 240 | Waldorf | Charles |
| 240 | Walkersville | Frederick |
| 240 | Washington Grove | Montgomery |
| 240 | Welcome | Charles |
| 240 | Westernport | Allegany |
| 240 | White Plains | Charles |
| 240 | Williamsport | Washington |
| 240 | Woodsboro | Frederick |