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 301 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 | |
|---|---|---|---|---|---|
| Abell (Maryland) | 301 | 20606 | St. Mary | US-MD | |
| Accident (Maryland) | 301 | 21520 | Garrett | US-MD | |
| Accokeek (Maryland) | 301 | 20607 | Prince Georges | US-MD | |
| Adamstown (Maryland) | 301 | 21710 | Frederick | US-MD | |
| Andrews Air Force Base (Maryland) | 301 | 20762 | Prince Georges | US-MD | |
| Annapolis (Maryland) | 301 | 21401 | Anne Arundel | US-MD | |
| Ashton (Maryland) | 301 | 20861 | Montgomery | US-MD | |
| Avenue (Maryland) | 301 | 20609 | St. Mary | US-MD | |
| Baltimore (Maryland) | 301 | 21201 | Baltimore city | US-MD | |
| Barton (Maryland) | 301 | 21521 | Allegany | US-MD | |
| Bel Alton (Maryland) | 301 | 20611 | Charles | US-MD | |
| Bethesda (Maryland) | 301 | 20817 | Montgomery | US-MD | |
| Bittinger (Maryland) | 301 | 21522 | Garrett | US-MD | |
| Bladensburg (Maryland) | 301 | 20710 | Prince Georges | US-MD | |
| Bowie (Maryland) | 301 | 20716 | Prince Georges | US-MD | |
| Bowie (Maryland) | 301 | 20721 | Prince Georges | US-MD | |
| Bowie (Maryland) | 301 | 20720 | Prince Georges | US-MD | |
| Brandywine (Maryland) | 301 | 20613 | Prince Georges | US-MD | |
| Brentwood (Maryland) | 301 | 20722 | Prince Georges | US-MD | |
| Brinklow (Maryland) | 301 | 20862 | Montgomery | US-MD | |
| Brookeville (Maryland) | 301 | 20833 | Montgomery | US-MD | |
| Brunswick (Maryland) | 301 | 21716 | Frederick | US-MD | |
| Bryans Road (Maryland) | 301 | 20616 | Charles | US-MD | |
| Burtonsville (Maryland) | 301 | 20866 | Montgomery | US-MD | |
| Bushwood (Maryland) | 301 | 20618 | St. Mary | US-MD | |
| California (Maryland) | 301 | 20619 | St. Mary | US-MD | |
| Callaway (Maryland) | 301 | 20620 | St. Mary | US-MD | |
| Capitol Heights (Maryland) | 301 | 20743 | Prince Georges | US-MD | |
| Cascade (Maryland) | 301 | 21719 | Washington | US-MD | |
| Chaptico (Maryland) | 301 | 20621 | St. Mary | US-MD | |
| Cheltenham (Maryland) | 301 | 20623 | Prince Georges | US-MD | |
| Chevy Chase (Maryland) | 301 | 20815 | Montgomery | US-MD | |
| Clear Spring (Maryland) | 301 | 21722 | Washington | US-MD | |
| Cumberland (Maryland) | 301 | 21502 | Allegany | US-MD | |
| Damascus (Maryland) | 301 | 20872 | Montgomery | US-MD | |
| Derwood (Maryland) | 301 | 20855 | Montgomery | US-MD | |
| Dhs (Maryland) | 301 | 20588 | Howard | US-MD | |
| Dickerson (Maryland) | 301 | 20842 | Montgomery | US-MD | |
| District Heights (Maryland) | 301 | 20747 | Prince Georges | US-MD | |
| Drayden (Maryland) | 301 | 20630 | St. Mary | US-MD | |
| Emmitsburg (Maryland) | 301 | 21727 | Frederick | US-MD | |
| Fort Washington (Maryland) | 301 | 20744 | Prince Georges | US-MD | |
| Frederick (Maryland) | 301 | 21701 | Frederick | US-MD | |
| Frederick (Maryland) | 301 | 21702 | Frederick | US-MD | |
| Friendsville (Maryland) | 301 | 21531 | Garrett | US-MD | |
| Frostburg (Maryland) | 301 | 21532 | Allegany | US-MD | |
| Gaithersburg (Maryland) | 301 | 20878 | Montgomery | US-MD | |
| Gaithersburg (Maryland) | 301 | 20879 | Montgomery | US-MD | |
| Glen Echo (Maryland) | 301 | 20812 | Montgomery | US-MD | |
| Glenn Dale (Maryland) | 301 | 20769 | Prince Georges | US-MD | |
| Grantsville (Maryland) | 301 | 21536 | Garrett | US-MD | |
| Great Mills (Maryland) | 301 | 20634 | St. Mary | US-MD | |
| Greenbelt (Maryland) | 301 | 20770 | Prince Georges | US-MD | |
| Hagerstown (Maryland) | 301 | 21740 | Washington | US-MD | |
| Hagerstown (Maryland) | 301 | 21742 | Washington | US-MD | |
| Hancock (Maryland) | 301 | 21750 | Washington | US-MD | |
| Hollywood (Maryland) | 301 | 20636 | St. Mary | US-MD | |
| Hughesville (Maryland) | 301 | 20637 | Charles | US-MD | |
| Hyattsville (Maryland) | 301 | 20783 | Prince Georges | US-MD | |
| Hyattsville (Maryland) | 301 | 20784 | Prince Georges | US-MD | |
| Hyattsville (Maryland) | 301 | 20781 | Prince Georges | US-MD | |
| Hyattsville (Maryland) | 301 | 20782 | Prince Georges | US-MD | |
| Hyattsville (Maryland) | 301 | 20785 | Prince Georges | US-MD | |
| Indian Head (Maryland) | 301 | 20640 | Charles | US-MD | |
| Issue (Maryland) | 301 | 20645 | Charles | US-MD | |
| Keedysville (Maryland) | 301 | 21756 | Washington | US-MD | |
| Kitzmiller (Maryland) | 301 | 21538 | Garrett | US-MD | |
| Knoxville (Maryland) | 301 | 21758 | Frederick | US-MD | |
| La Plata (Maryland) | 301 | 20646 | Charles | US-MD | |
| Lanham (Maryland) | 301 | 20706 | Prince Georges | US-MD | |
| Leonardtown (Maryland) | 301 | 20650 | St. Mary | US-MD | |
| Lexington Park (Maryland) | 301 | 20653 | St. Mary | US-MD | |
| Lonaconing (Maryland) | 301 | 21539 | Allegany | US-MD | |
| Lothian (Maryland) | 301 | 20711 | Anne Arundel | US-MD | |
| Loveville (Maryland) | 301 | 20656 | St. Mary | US-MD | |
| Luke (Maryland) | 301 | 21540 | Allegany | US-MD | |
| Mc Henry (Maryland) | 301 | 21541 | Garrett | US-MD | |
| Mechanicsville (Maryland) | 301 | 20659 | St. Mary | US-MD | |
| Middletown (Maryland) | 301 | 21769 | Frederick | US-MD | |
| Monrovia (Maryland) | 301 | 21770 | Frederick | US-MD | |
| Montgomery Village (Maryland) | 301 | 20886 | Montgomery | US-MD | |
| Mount Airy (Maryland) | 301 | 21771 | Frederick | US-MD | |
| Mount Savage (Maryland) | 301 | 21545 | Allegany | US-MD | |
| Myersville (Maryland) | 301 | 21773 | Frederick | US-MD | |
| Nanjemoy (Maryland) | 301 | 20662 | Charles | US-MD | |
| New Market (Maryland) | 301 | 21774 | Frederick | US-MD | |
| Oakland (Maryland) | 301 | 21550 | Garrett | US-MD | |
| Oldtown (Maryland) | 301 | 21555 | Allegany | US-MD | |
| Patuxent River (Maryland) | 301 | 20670 | St. Mary | US-MD | |
| Piney Point (Maryland) | 301 | 20674 | St. Mary | US-MD | |
| Pomfret (Maryland) | 301 | 20675 | Charles | US-MD | |
| Poolesville (Maryland) | 301 | 20837 | Montgomery | US-MD | |
| Port Tobacco (Maryland) | 301 | 20677 | Charles | US-MD | |
| Potomac (Maryland) | 301 | 20854 | Montgomery | US-MD | |
| Ridge (Maryland) | 301 | 20680 | St. Mary | US-MD | |
| Riverdale (Maryland) | 301 | 20737 | Prince Georges | US-MD | |
| Rockville (Maryland) | 301 | 20850 | Montgomery | US-MD | |
| Rockville (Maryland) | 301 | 20851 | Montgomery | US-MD | |
| Rockville (Maryland) | 301 | 20852 | Montgomery | US-MD | |
| Rockville (Maryland) | 301 | 20853 | Montgomery | US-MD | |
| Sandy Spring (Maryland) | 301 | 20860 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 301 | 20903 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 301 | 20904 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 301 | 20905 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 301 | 20901 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 301 | 20902 | Montgomery | US-MD | |
| Silver Spring (Maryland) | 301 | 20910 | Montgomery | US-MD | |
| Smithsburg (Maryland) | 301 | 21783 | Washington | US-MD | |
| Spencerville (Maryland) | 301 | 20868 | Montgomery | US-MD | |
| Swanton (Maryland) | 301 | 21561 | Garrett | US-MD | |
| Takoma Park (Maryland) | 301 | 20912 | Montgomery | US-MD | |
| Tall Timbers (Maryland) | 301 | 20690 | St. Mary | US-MD | |
| Temple Hills (Maryland) | 301 | 20748 | Prince Georges | US-MD | |
| Thurmont (Maryland) | 301 | 21788 | Frederick | US-MD | |
| Upper Marlboro (Maryland) | 301 | 20772 | Prince Georges | US-MD | |
| Upper Marlboro (Maryland) | 301 | 20774 | Prince Georges | US-MD | |
| Valley Lee (Maryland) | 301 | 20692 | St. Mary | US-MD | |
| Waldorf (Maryland) | 301 | 20601 | Charles | US-MD | |
| Waldorf (Maryland) | 301 | 20602 | Charles | US-MD | |
| Waldorf (Maryland) | 301 | 20603 | Charles | US-MD | |
| Walkersville (Maryland) | 301 | 21793 | Frederick | US-MD | |
| Washington (District of Columbia) | 301 | 20006 | District of Columbia | US-DC | |
| Washington (District of Columbia) | 301 | 20024 | District of Columbia | US-DC | |
| Washington (District of Columbia) | 301 | 20058 | District of Columbia | US-DC | |
| White Plains (Maryland) | 301 | 20695 | Charles | US-MD | |
| Williamsport (Maryland) | 301 | 21795 | Washington | US-MD |