To faciltiate users, the United States of America is divided into regions known as Area Codes, corresponding to particular geographic telephone dialing areas.
An area code denotes the regional location of a phone number within the United States.
The Area Code table below shows an area codes each.
Area Code 240 listing, by city
@The cities listed with each area code are the major cities for that area code;
| City / State | Area code | Zip Code | County | Iso | |
|---|---|---|---|---|---|
| Aquasco (Maryland) | 240 | 20608 | Prince Georges | US-MD | |
| Barnesville (Maryland) | 240 | 20838 | Montgomery | US-MD | |
| Beallsville (Maryland) | 240 | 20839 | Montgomery | US-MD | |
| Beltsville (Maryland) | 240 | 20704 | Prince Georges | US-MD | |
| Benedict (Maryland) | 240 | 20612 | Charles | US-MD | |
| Bethesda (Maryland) | 240 | 20810 | Montgomery | US-MD | |
| Bethesda (Maryland) | 240 | 20811 | Montgomery | US-MD | |
| Bethesda (Maryland) | 240 | 20813 | Montgomery | US-MD | |
| Bethesda (Maryland) | 240 | 20824 | Montgomery | US-MD | |
| Bethesda (Maryland) | 240 | 20827 | Montgomery | US-MD | |
| Bethesda (Maryland) | 240 | 20889 | Montgomery | US-MD | |
| Bethesda (Maryland) | 240 | 20892 | Montgomery | US-MD | |
| Bethesda (Maryland) | 240 | 20894 | Montgomery | US-MD | |
| Bethesda (Maryland) | 240 | 20814 | Montgomery | US-MD | |
| Bethesda (Maryland) | 240 | 20816 | Montgomery | US-MD | |
| Big Pool (Maryland) | 240 | 21711 | Washington | US-MD | |
| Bloomington (Maryland) | 240 | 21523 | Garrett | US-MD | |
| Boonsboro (Maryland) | 240 | 21713 | Washington | US-MD | |
| Bowie (Maryland) | 240 | 20717 | Prince Georges | US-MD | |
| Bowie (Maryland) | 240 | 20718 | Prince Georges | US-MD | |
| Bowie (Maryland) | 240 | 20719 | Prince Georges | US-MD | |
| Bowie (Maryland) | 240 | 20715 | Prince Georges | US-MD | |
| Boyds (Maryland) | 240 | 20841 | Montgomery | US-MD | |
| Braddock Heights (Maryland) | 240 | 21714 | Frederick | US-MD | |
| Brownsville (Maryland) | 240 | 21715 | Washington | US-MD | |
| Bryantown (Maryland) | 240 | 20617 | Charles | US-MD | |
| Buckeystown (Maryland) | 240 | 21717 | Frederick | US-MD | |
| Burkittsville (Maryland) | 240 | 21718 | Frederick | US-MD | |
| Cabin John (Maryland) | 240 | 20818 | Montgomery | US-MD | |
| Capitol Heights (Maryland) | 240 | 20731 | Prince Georges | US-MD | |
| Capitol Heights (Maryland) | 240 | 20790 | Prince Georges | US-MD | |
| Capitol Heights (Maryland) | 240 | 20791 | Prince Georges | US-MD | |
| Capitol Heights (Maryland) | 240 | 20799 | Prince Georges | US-MD | |
| Cavetown (Maryland) | 240 | 21720 | Washington | US-MD | |
| Charlotte Hall (Maryland) | 240 | 20622 | Charles | US-MD | |
| Chevy Chase (Maryland) | 240 | 20825 | Montgomery | US-MD | |
| Chewsville (Maryland) | 240 | 21721 | Washington | US-MD | |
| Clarksburg (Maryland) | 240 | 20871 | Montgomery | US-MD | |
| Clarksville (Maryland) | 240 | 21029 | Howard | US-MD | |
| Clements (Maryland) | 240 | 20624 | St. Mary | US-MD | |
| Clinton (Maryland) | 240 | 20735 | Prince Georges | US-MD | |
| Cobb Island (Maryland) | 240 | 20625 | Charles | US-MD | |
| College Park (Maryland) | 240 | 20741 | Prince Georges | US-MD | |
| College Park (Maryland) | 240 | 20742 | Prince Georges | US-MD | |
| College Park (Maryland) | 240 | 20740 | Prince Georges | US-MD | |
| Coltons Point (Maryland) | 240 | 20626 | St. Mary | US-MD | |
| Columbia (Maryland) | 240 | 21046 | Howard | US-MD | |
| Columbia (Maryland) | 240 | 21046 | Howard | US-MD | |
| Compton (Maryland) | 240 | 20627 | St. Mary | US-MD | |
| Corriganville (Maryland) | 240 | 21524 | Allegany | US-MD | |
| Cumberland (Maryland) | 240 | 21501 | Allegany | US-MD | |
| Cumberland (Maryland) | 240 | 21503 | Allegany | US-MD | |
| Cumberland (Maryland) | 240 | 21504 | Allegany | US-MD | |
| Cumberland (Maryland) | 240 | 21505 | Allegany | US-MD | |
| Dameron (Maryland) | 240 | 20628 | St. Mary | US-MD | |
| Dayton (Maryland) | 240 | 21036 | Howard | US-MD | |
| District Heights (Maryland) | 240 | 20753 | Prince Georges | US-MD | |
| Eckhart Mines (Maryland) | 240 | 21528 | Allegany | US-MD | |
| Ellerslie (Maryland) | 240 | 21529 | Allegany | US-MD | |
| Fairplay (Maryland) | 240 | 21733 | Washington | US-MD | |
| Faulkner (Maryland) | 240 | 20632 | Charles | US-MD | |
| Flintstone (Maryland) | 240 | 21530 | Allegany | US-MD | |
| Fort Washington (Maryland) | 240 | 20749 | Prince Georges | US-MD | |
| Frederick (Maryland) | 240 | 21705 | Frederick | US-MD | |
| Frederick (Maryland) | 240 | 21709 | Frederick | US-MD | |
| Frederick (Maryland) | 240 | 21703 | Frederick | US-MD | |
| Frederick (Maryland) | 240 | 21704 | Frederick | US-MD | |
| Funkstown (Maryland) | 240 | 21734 | Washington | US-MD | |
| Gaithersburg (Maryland) | 240 | 20882 | Montgomery | US-MD | |
| Gaithersburg (Maryland) | 240 | 20883 | Montgomery | US-MD | |
| Gaithersburg (Maryland) | 240 | 20884 | Montgomery | US-MD | |
| Gaithersburg (Maryland) | 240 | 20885 | Montgomery | US-MD | |
| Gaithersburg (Maryland) | 240 | 20898 | Montgomery | US-MD | |
| Gaithersburg (Maryland) | 240 | 20899 | Montgomery | US-MD | |
| Gaithersburg (Maryland) | 240 | 20877 | Montgomery | US-MD | |
| Gambrills (Maryland) | 240 | 21054 | Anne Arundel | US-MD | |
| Garrett Park (Maryland) | 240 | 20896 | Montgomery | US-MD | |
| Germantown (Maryland) | 240 | 20874 | Montgomery | US-MD | |
| Germantown (Maryland) | 240 | 20875 | Montgomery | US-MD | |
| Germantown (Maryland) | 240 | 20876 | Montgomery | US-MD | |
| Greenbelt (Maryland) | 240 | 20768 | Prince Georges | US-MD | |
| Greenbelt (Maryland) | 240 | 20771 | Prince Georges | US-MD | |
| Hagerstown (Maryland) | 240 | 21741 | Washington | US-MD | |
| Hagerstown (Maryland) | 240 | 21746 | Washington | US-MD | |
| Hagerstown (Maryland) | 240 | 21747 | Washington | US-MD | |
| Hagerstown (Maryland) | 240 | 21748 | Washington | US-MD | |
| Hagerstown (Maryland) | 240 | 21749 | Washington | US-MD | |
| Helen (Maryland) | 240 | 20635 | St Mary | US-MD | |
| Highland (Maryland) | 240 | 20777 | Howard | US-MD | |
| Hyattsville (Maryland) | 240 | 20787 | Prince Georges | US-MD | |
| Hyattsville (Maryland) | 240 | 20788 | Prince Georges | US-MD | |
| Ijamsville (Maryland) | 240 | 21754 | Frederick | US-MD | |
| Ironsides (Maryland) | 240 | 20643 | Charles | US-MD | |
| Jefferson (Maryland) | 240 | 21755 | Frederick | US-MD | |
| Kensington (Maryland) | 240 | 20891 | Montgomery | US-MD | |
| Kensington (Maryland) | 240 | 20895 | Montgomery | US-MD | |
| Ladiesburg (Maryland) | 240 | 21759 | Frederick | US-MD | |
| Lanham (Maryland) | 240 | 20703 | Prince Georges | US-MD | |
| Laurel (Maryland) | 240 | 20709 | Prince Georges | US-MD | |
| Laurel (Maryland) | 240 | 20725 | Prince Georges | US-MD | |
| Laurel (Maryland) | 240 | 20726 | Prince Georges | US-MD | |
| Libertytown (Maryland) | 240 | 21762 | Frederick | US-MD | |
| Little Orleans (Maryland) | 240 | 21766 | Allegany | US-MD | |
| Marbury (Maryland) | 240 | 20658 | Charles | US-MD | |
| Maugansville (Maryland) | 240 | 21767 | Washington | US-MD | |
| Midland (Maryland) | 240 | 21542 | Allegany | US-MD | |
| Midlothian (Maryland) | 240 | 21543 | Allegany | US-MD | |
| Morganza (Maryland) | 240 | 20660 | St. Mary | US-MD | |
| Mount Rainier (Maryland) | 240 | 20712 | Prince Georges | US-MD | |
| Mount Victoria (Maryland) | 240 | 20661 | Charles | US-MD | |
| New Midway (Maryland) | 240 | 21775 | Frederick | US-MD | |
| Newburg (Maryland) | 240 | 20664 | Charles | US-MD | |
| Olney (Maryland) | 240 | 20830 | Montgomery | US-MD | |
| Olney (Maryland) | 240 | 20832 | Montgomery | US-MD | |
| Oxon Hill (Maryland) | 240 | 20750 | Prince Georges | US-MD | |
| Oxon Hill (Maryland) | 240 | 20745 | Prince Georges | US-MD | |
| Park Hall (Maryland) | 240 | 20667 | St. Mary | US-MD | |
| Pinto (Maryland) | 240 | 21556 | Allegany | US-MD | |
| Point Of Rocks (Maryland) | 240 | 21777 | Frederick | US-MD | |
| Potomac (Maryland) | 240 | 20859 | Montgomery | US-MD | |
| Rawlings (Maryland) | 240 | 21557 | Allegany | US-MD | |
| Riverdale (Maryland) | 240 | 20738 | Prince Georges | US-MD | |
| Rock Point (Maryland) | 240 | 20682 | Charles | US-MD | |
| Rockville (Maryland) | 240 | 20847 | Montgomery | US-MD | |
| Rockville (Maryland) | 240 | 20848 | Montgomery | US-MD | |
| Rockville (Maryland) | 240 | 20849 | Montgomery | US-MD | |
| Rockville (Maryland) | 240 | 20857 | Montgomery | US-MD | |
| Rocky Ridge (Maryland) | 240 | 21778 | Frederick | US-MD | |
| Rohrersville (Maryland) | 240 | 21779 | Washington | US-MD | |
| Sabillasville (Maryland) | 240 | 21780 | Frederick | US-MD | |
| Saint Inigoes (Maryland) | 240 | 20684 | St. Mary | US-MD | |
| Saint James (Maryland) | 240 | 21781 | Washington | US-MD | |
| Saint Marys City (Maryland) | 240 | 20686 | St. Mary | US-MD | |
| Scotland (Maryland) | 240 | 20687 | St. Mary | US-MD | |
| Sharpsburg (Maryland) | 240 | 21782 | Washington | US-MD | |
| Silver Spring (Maryland) | 240 | 20907 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 240 | 20908 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 240 | 20911 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 240 | 20914 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 240 | 20915 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 240 | 20916 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 240 | 20918 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 240 | 20993 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 240 | 20997 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 240 | 20906 | Montgomery | US-MD | |
| Southern Md Facility (Maryland) | 240 | 20697 | Prince Georges | US-MD | |
| Southern Md Facility (Maryland) | 240 | 20797 | Prince Georges | US-MD | |
| Spring Gap (Maryland) | 240 | 21560 | Mineral | US-MD | |
| Suburb Maryland Fac (Maryland) | 240 | 20897 | Montgomery | US-MD | |
| Suitland (Maryland) | 240 | 20752 | Prince Georges | US-MD | |
| Suitland (Maryland) | 240 | 20746 | Prince Georges | US-MD | |
| Takoma Park (Maryland) | 240 | 20913 | Montgomery | US-MD | |
| Temple Hills (Maryland) | 240 | 20757 | Prince Georges | US-MD | |
| Tuscarora (Maryland) | 240 | 21790 | Frederick | US-MD | |
| Unionville (Maryland) | 240 | 21792 | Frederick | US-MD | |
| Upper Marlboro (Maryland) | 240 | 20773 | Prince Georges | US-MD | |
| Upper Marlboro (Maryland) | 240 | 20775 | Prince Georges | US-MD | |
| Upper Marlboro (Maryland) | 240 | 20792 | Prince Georges | US-MD | |
| Waldorf (Maryland) | 240 | 20604 | Charles | US-MD | |
| Washington Grove (Maryland) | 240 | 20880 | Montgomery | US-MD | |
| Welcome (Maryland) | 240 | 20693 | Charles | US-MD | |
| Westernport (Maryland) | 240 | 21562 | Allegany | US-MD | |
| Woodsboro (Maryland) | 240 | 21798 | Frederick | US-MD |