| CITY and (COUNTY) | ZIP CODE | STATE | AREA CODE |
| Abell - (Saint Marys) | 20606 | Maryland | 301 |
| Accident - (Garrett) | 21520 | Maryland | 301 |
| Accokeek - (Prince Georges) | 20607 | Maryland | 301 |
| Adamstown - (Frederick) | 21710 | Maryland | 301 |
| Andrews Air Force Base - (Prince Georges) | 20762 | Maryland | 301 |
| Aquasco - (Prince Georges) | 20608 | Maryland | 301 |
| Ashton - (Montgomery) | 20861 | Maryland | 301 |
| Avenue - (Saint Marys) | 20609 | Maryland | 301 |
| Barnesville - (Montgomery) | 20838 | Maryland | 301 |
| Barton - (Allegany) | 21521 | Maryland | 301 |
| Beallsville - (Montgomery) | 20839 | Maryland | 301 |
| Bel Alton - (Charles) | 20611 | Maryland | 301 |
| Beltsville - (Prince Georges) | 20704 | Maryland | 301 |
| Beltsville - (Prince Georges) | 20705 | Maryland | 301 |
| Benedict - (Charles) | 20612 | Maryland | 301 |
| Bethesda - (Montgomery) | 20810 | Maryland | 301 |
| Bethesda - (Montgomery) | 20811 | Maryland | 301 |
| Bethesda - (Montgomery) | 20813 | Maryland | 301 |
| Bethesda - (Montgomery) | 20814 | Maryland | 301 |
| Bethesda - (Montgomery) | 20816 | Maryland | 301 |
| Bethesda - (Montgomery) | 20817 | Maryland | 301 |
| Bethesda - (Montgomery) | 20824 | Maryland | 301 |
| Bethesda - (Montgomery) | 20827 | Maryland | 301 |
| Bethesda - (Montgomery) | 20889 | Maryland | 301 |
| Bethesda - (Montgomery) | 20892 | Maryland | 301 |
| Bethesda - (Montgomery) | 20894 | Maryland | 301 |
| Big Pool - (Washington) | 21711 | Maryland | 301 |
| Bittinger - (Garrett) | 21522 | Maryland | 301 |
| Bladensburg - (Prince Georges) | 20710 | Maryland | 301 |
| Bloomington - (Garrett) | 21523 | Maryland | 301 |
| Boonsboro - (Washington) | 21713 | Maryland | 301 |
| Bowie - (Prince Georges) | 20715 | Maryland | 301 |
| Bowie - (Prince Georges) | 20716 | Maryland | 301 |
| Bowie - (Prince Georges) | 20717 | Maryland | 301 |
| Bowie - (Prince Georges) | 20718 | Maryland | 301 |
| Bowie - (Prince Georges) | 20719 | Maryland | 301 |
| Bowie - (Prince Georges) | 20720 | Maryland | 301 |
| Bowie - (Prince Georges) | 20721 | Maryland | 301 |
| Boyds - (Montgomery) | 20841 | Maryland | 301 |
| Braddock Heights - (Frederick) | 21714 | Maryland | 301 |
| Brandywine - (Prince Georges) | 20613 | Maryland | 301 |
| Brentwood - (Prince Georges) | 20722 | Maryland | 301 |
| Brinklow - (Montgomery) | 20862 | Maryland | 301 |
| Brookeville - (Montgomery) | 20833 | Maryland | 301 |
| Brownsville - (Washington) | 21715 | Maryland | 301 |
| Brunswick - (Frederick) | 21716 | Maryland | 301 |
| Bryans Road - (Charles) | 20616 | Maryland | 301 |
| Bryantown - (Charles) | 20617 | Maryland | 301 |
| Buckeystown - (Frederick) | 21717 | Maryland | 301 |
| Burkittsville - (Frederick) | 21718 | Maryland | 301 |
| Burtonsville - (Montgomery) | 20866 | Maryland | 301 |
| Bushwood - (Saint Marys) | 20618 | Maryland | 301 |
| Cabin John - (Montgomery) | 20818 | Maryland | 301 |
| California - (Saint Marys) | 20619 | Maryland | 301 |
| Callaway - (Saint Marys) | 20620 | Maryland | 301 |
| Capitol Heights - (Prince Georges) | 20799 | Maryland | 240 |
| Capitol Heights - (Prince Georges) | 20731 | Maryland | 301 |
| Capitol Heights - (Prince Georges) | 20743 | Maryland | 301 |
| Capitol Heights - (Prince Georges) | 20790 | Maryland | 301 |
| Capitol Heights - (Prince Georges) | 20791 | Maryland | 301 |
| Cascade - (Washington) | 21719 | Maryland | 301 |
| Cavetown - (Washington) | 21720 | Maryland | 301 |
| Chaptico - (Saint Marys) | 20621 | Maryland | 301 |
| Charlotte Hall - (Saint Marys) | 20622 | Maryland | 301 |
| Cheltenham - (Prince Georges) | 20623 | Maryland | 301 |
| Chevy Chase - (Montgomery) | 20815 | Maryland | 301 |
| Chevy Chase - (Montgomery) | 20825 | Maryland | 301 |
| Chewsville - (Washington) | 21721 | Maryland | 301 |
| Clarksburg - (Montgomery) | 20871 | Maryland | 301 |
| Clear Spring - (Washington) | 21722 | Maryland | 301 |
| Clements - (Saint Marys) | 20624 | Maryland | 301 |
| Clinton - (Prince Georges) | 20735 | Maryland | 301 |
| Cobb Island - (Charles) | 20625 | Maryland | 301 |
| College Park - (Prince Georges) | 20740 | Maryland | 301 |
| College Park - (Prince Georges) | 20741 | Maryland | 301 |
| College Park - (Prince Georges) | 20742 | Maryland | 301 |
| Coltons Point - (Saint Marys) | 20626 | Maryland | 301 |
| Compton - (Saint Marys) | 20627 | Maryland | 301 |
| Corriganville - (Allegany) | 21524 | Maryland | 301 |
| Cumberland - (Allegany) | 21501 | Maryland | 301 |
| Cumberland - (Allegany) | 21502 | Maryland | 301 |
| Cumberland - (Allegany) | 21503 | Maryland | 301 |
| Cumberland - (Allegany) | 21504 | Maryland | 301 |
| Cumberland - (Allegany) | 21505 | Maryland | 301 |
| Damascus - (Montgomery) | 20872 | Maryland | 301 |
| Dameron - (Saint Marys) | 20628 | Maryland | 301 |
| Derwood - (Montgomery) | 20855 | Maryland | 301 |
| Dickerson - (Montgomery) | 20842 | Maryland | 301 |
| District Heights - (Prince Georges) | 20747 | Maryland | 301 |
| District Heights - (Prince Georges) | 20753 | Maryland | 301 |
| Drayden - (Saint Marys) | 20630 | Maryland | 301 |
| Eckhart Mines - (Allegany) | 21528 | Maryland | 301 |
| Ellerslie - (Allegany) | 21529 | Maryland | 301 |
| Emmitsburg - (Frederick) | 21727 | Maryland | 301 |
| Fairplay - (Washington) | 21733 | Maryland | 301 |
| Faulkner - (Charles) | 20632 | Maryland | 301 |
| Flintstone - (Allegany) | 21530 | Maryland | 301 |
| Fort Washington - (Prince Georges) | 20744 | Maryland | 301 |
| Fort Washington - (Prince Georges) | 20749 | Maryland | 301 |
| Frederick - (Frederick) | 21701 | Maryland | 301 |
| Frederick - (Frederick) | 21702 | Maryland | 301 |
| Frederick - (Frederick) | 21703 | Maryland | 301 |
| Frederick - (Frederick) | 21704 | Maryland | 301 |
| Frederick - (Frederick) | 21705 | Maryland | 301 |
| Frederick - (Frederick) | 21709 | Maryland | 301 |
| Friendship - (Anne Arundel) | 20758 | Maryland | 301 |
| Friendsville - (Garrett) | 21531 | Maryland | 301 |
| Frostburg - (Allegany) | 21532 | Maryland | 301 |
| Funkstown - (Washington) | 21734 | Maryland | 301 |
| Gaithersburg - (Montgomery) | 20877 | Maryland | 301 |
| Gaithersburg - (Montgomery) | 20878 | Maryland | 301 |
| Gaithersburg - (Montgomery) | 20879 | Maryland | 301 |
| Gaithersburg - (Montgomery) | 20882 | Maryland | 301 |
| Gaithersburg - (Montgomery) | 20883 | Maryland | 301 |
| Gaithersburg - (Montgomery) | 20884 | Maryland | 301 |
| Gaithersburg - (Montgomery) | 20885 | Maryland | 301 |
| Gaithersburg - (Montgomery) | 20898 | Maryland | 301 |
| Gaithersburg - (Montgomery) | 20899 | Maryland | 301 |
| Garrett Park - (Montgomery) | 20896 | Maryland | 301 |
| Germantown - (Montgomery) | 20874 | Maryland | 301 |
| Germantown - (Montgomery) | 20875 | Maryland | 301 |
| Germantown - (Montgomery) | 20876 | Maryland | 301 |
| Glen Echo - (Montgomery) | 20812 | Maryland | 301 |
| Glenn Dale - (Prince Georges) | 20769 | Maryland | 301 |
| Grantsville - (Garrett) | 21536 | Maryland | 301 |
| Great Mills - (Saint Marys) | 20634 | Maryland | 301 |
| Greenbelt - (Prince Georges) | 20768 | Maryland | 301 |
| Greenbelt - (Prince Georges) | 20770 | Maryland | 301 |
| Greenbelt - (Prince Georges) | 20771 | Maryland | 301 |
| Hagerstown - (Washington) | 21740 | Maryland | 301 |
| Hagerstown - (Washington) | 21741 | Maryland | 301 |
| Hagerstown - (Washington) | 21742 | Maryland | 301 |
| Hagerstown - (Washington) | 21746 | Maryland | 301 |
| Hagerstown - (Washington) | 21747 | Maryland | 301 |
| Hagerstown - (Washington) | 21748 | Maryland | 301 |
| Hagerstown - (Washington) | 21749 | Maryland | 301 |
| Hancock - (Washington) | 21750 | Maryland | 301 |
| Helen - (Saint Marys) | 20635 | Maryland | 301 |
| Highland - (Howard) | 20777 | Maryland | 301 |
| Hollywood - (Saint Marys) | 20636 | Maryland | 301 |
| Hughesville - (Charles) | 20637 | Maryland | 301 |
| Hyattsville - (Prince Georges) | 20781 | Maryland | 301 |
| Hyattsville - (Prince Georges) | 20782 | Maryland | 301 |
| Hyattsville - (Prince Georges) | 20783 | Maryland | 301 |
| Hyattsville - (Prince Georges) | 20784 | Maryland | 301 |
| Hyattsville - (Prince Georges) | 20785 | Maryland | 301 |
| Hyattsville - (Prince Georges) | 20787 | Maryland | 301 |
| Hyattsville - (Prince Georges) | 20788 | Maryland | 301 |
| Ijamsville - (Frederick) | 21754 | Maryland | 301 |
| Indian Head - (Charles) | 20640 | Maryland | 301 |
| Ironsides - (Charles) | 20643 | Maryland | 301 |
| Issue - (Charles) | 20645 | Maryland | 301 |
| Jefferson - (Frederick) | 21755 | Maryland | 301 |
| Keedysville - (Washington) | 21756 | Maryland | 301 |
| Kensington - (Montgomery) | 20891 | Maryland | 301 |
| Kensington - (Montgomery) | 20895 | Maryland | 301 |
| Kitzmiller - (Garrett) | 21538 | Maryland | 301 |
| Knoxville - (Frederick) | 21758 | Maryland | 301 |
| La Plata - (Charles) | 20646 | Maryland | 301 |
| Ladiesburg - (Frederick) | 21759 | Maryland | 301 |
| Lanham - (Prince Georges) | 20703 | Maryland | 301 |
| Lanham - (Prince Georges) | 20706 | Maryland | 301 |
| Laurel - (Prince Georges) | 20707 | Maryland | 301 |
| Laurel - (Prince Georges) | 20708 | Maryland | 301 |
| Laurel - (Prince Georges) | 20709 | Maryland | 301 |
| Laurel - (Howard) | 20723 | Maryland | 301 |
| Laurel - (Anne Arundel) | 20724 | Maryland | 301 |
| Laurel - (Prince Georges) | 20725 | Maryland | 301 |
| Laurel - (Prince Georges) | 20726 | Maryland | 301 |
| Leonardtown - (Saint Marys) | 20650 | Maryland | 301 |
| Lexington Park - (Saint Marys) | 20653 | Maryland | 301 |
| Libertytown - (Frederick) | 21762 | Maryland | 301 |
| Little Orleans - (Allegany) | 21766 | Maryland | 301 |
| Lonaconing - (Allegany) | 21539 | Maryland | 301 |
| Loveville - (Saint Marys) | 20656 | Maryland | 301 |
| Luke - (Allegany) | 21540 | Maryland | 301 |
| Marbury - (Charles) | 20658 | Maryland | 301 |
| Maugansville - (Washington) | 21767 | Maryland | 301 |
| Mc Henry - (Garrett) | 21541 | Maryland | 301 |
| Mechanicsville - (Saint Marys) | 20659 | Maryland | 301 |
| Middletown - (Frederick) | 21769 | Maryland | 301 |
| Midland - (Allegany) | 21542 | Maryland | 301 |
| Midlothian - (Allegany) | 21543 | Maryland | 301 |
| Monrovia - (Frederick) | 21770 | Maryland | 301 |
| Montgomery Village - (Montgomery) | 20886 | Maryland | 301 |
| Morganza - (Saint Marys) | 20660 | Maryland | 301 |
| Mount Airy - (Frederick) | 21771 | Maryland | 301 |
| Mount Rainier - (Prince Georges) | 20712 | Maryland | 301 |
| Mount Savage - (Allegany) | 21545 | Maryland | 301 |
| Mount Victoria - (Charles) | 20661 | Maryland | 301 |
| Myersville - (Frederick) | 21773 | Maryland | 301 |
| Nanjemoy - (Charles) | 20662 | Maryland | 301 |
| New Market - (Frederick) | 21774 | Maryland | 301 |
| New Midway - (Frederick) | 21775 | Maryland | 301 |
| Newburg - (Charles) | 20664 | Maryland | 301 |
| Oakland - (Garrett) | 21550 | Maryland | 301 |
| Oldtown - (Allegany) | 21555 | Maryland | 301 |
| Olney - (Montgomery) | 20830 | Maryland | 301 |
| Olney - (Montgomery) | 20832 | Maryland | 301 |
| Owings - (Calvert) | 20736 | Maryland | 301 |
| Oxon Hill - (Prince Georges) | 20745 | Maryland | 301 |
| Oxon Hill - (Prince Georges) | 20750 | Maryland | 301 |
| Park Hall - (Saint Marys) | 20667 | Maryland | 301 |
| Patuxent River - (Saint Marys) | 20670 | Maryland | 301 |
| Piney Point - (Saint Marys) | 20674 | Maryland | 301 |
| Pinto - (Allegany) | 21556 | Maryland | 301 |
| Point Of Rocks - (Frederick) | 21777 | Maryland | 301 |
| Pomfret - (Charles) | 20675 | Maryland | 301 |
| Poolesville - (Montgomery) | 20837 | Maryland | 301 |
| Port Tobacco - (Charles) | 20677 | Maryland | 301 |
| Potomac - (Montgomery) | 20854 | Maryland | 301 |
| Potomac - (Montgomery) | 20859 | Maryland | 301 |
| Rawlings - (Allegany) | 21557 | Maryland | 301 |
| Ridge - (Saint Marys) | 20680 | Maryland | 301 |
| Riverdale - (Prince Georges) | 20737 | Maryland | 301 |
| Riverdale - (Prince Georges) | 20738 | Maryland | 301 |
| Rock Point - (Charles) | 20682 | Maryland | 301 |
| Rockville - (Montgomery) | 20847 | Maryland | 301 |
| Rockville - (Montgomery) | 20848 | Maryland | 301 |
| Rockville - (Montgomery) | 20849 | Maryland | 301 |
| Rockville - (Montgomery) | 20850 | Maryland | 301 |
| Rockville - (Montgomery) | 20851 | Maryland | 301 |
| Rockville - (Montgomery) | 20852 | Maryland | 301 |
| Rockville - (Montgomery) | 20853 | Maryland | 301 |
| Rockville - (Montgomery) | 20857 | Maryland | 301 |
| Rocky Ridge - (Frederick) | 21778 | Maryland | 301 |
| Rohrersville - (Washington) | 21779 | Maryland | 301 |
| Sabillasville - (Frederick) | 21780 | Maryland | 301 |
| Saint Inigoes - (Saint Marys) | 20684 | Maryland | 301 |
| Saint James - (Washington) | 21781 | Maryland | 301 |
| Saint Marys City - (Saint Marys) | 20686 | Maryland | 301 |
| Sandy Spring - (Montgomery) | 20860 | Maryland | 301 |
| Scotland - (Saint Marys) | 20687 | Maryland | 301 |
| Sharpsburg - (Washington) | 21782 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20901 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20902 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20903 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20904 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20905 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20906 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20907 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20908 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20910 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20911 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20914 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20915 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20916 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20918 | Maryland | 301 |
| Silver Spring - (Montgomery) | 20997 | Maryland | 301 |
| Smithsburg - (Washington) | 21783 | Maryland | 301 |
| Southern Md Facility - (Prince Georges) | 20697 | Maryland | 301 |
| Southern Md Facility - (Prince Georges) | 20797 | Maryland | 301 |
| Spencerville - (Montgomery) | 20868 | Maryland | 301 |
| Spring Gap - (Allegany) | 21560 | Maryland | 301 |
| Suburb Maryland Fac - (Montgomery) | 20897 | Maryland | 301 |
| Suitland - (Prince Georges) | 20746 | Maryland | 301 |
| Suitland - (Prince Georges) | 20752 | Maryland | 301 |
| Swanton - (Garrett) | 21561 | Maryland | 301 |
| Takoma Park - (Montgomery) | 20912 | Maryland | 301 |
| Takoma Park - (Montgomery) | 20913 | Maryland | 301 |
| Tall Timbers - (Saint Marys) | 20690 | Maryland | 301 |
| Temple Hills - (Prince Georges) | 20748 | Maryland | 301 |
| Temple Hills - (Prince Georges) | 20757 | Maryland | 301 |
| Thurmont - (Frederick) | 21788 | Maryland | 301 |
| Tuscarora - (Frederick) | 21790 | Maryland | 301 |
| Unionville - (Frederick) | 21792 | Maryland | 301 |
| Upper Marlboro - (Prince Georges) | 20772 | Maryland | 301 |
| Upper Marlboro - (Prince Georges) | 20773 | Maryland | 301 |
| Upper Marlboro - (Prince Georges) | 20774 | Maryland | 301 |
| Upper Marlboro - (Prince Georges) | 20775 | Maryland | 301 |
| Upper Marlboro - (Prince Georges) | 20792 | Maryland | 301 |
| Valley Lee - (Saint Marys) | 20692 | Maryland | 301 |
| Waldorf - (Charles) | 20601 | Maryland | 301 |
| Waldorf - (Charles) | 20602 | Maryland | 301 |
| Waldorf - (Charles) | 20603 | Maryland | 301 |
| Waldorf - (Charles) | 20604 | Maryland | 301 |
| Walkersville - (Frederick) | 21793 | Maryland | 301 |
| Washington Grove - (Montgomery) | 20880 | Maryland | 301 |
| Welcome - (Charles) | 20693 | Maryland | 301 |
| Westernport - (Allegany) | 21562 | Maryland | 301 |
| White Plains - (Charles) | 20695 | Maryland | 301 |
| Williamsport - (Washington) | 21795 | Maryland | 301 |
| Woodsboro - (Frederick) | 21798 | Maryland | 301 |
