Area Code 301 Details

301 is the area code for Maryland’s portion of the Washington, DC metro area, including portions of southern Maryland, and points northwest of DC. This area encompasses Cumberland, Frederick, Hagerstown, and Gaithersburg. The 301 area code served as the area code for the entire state of Maryland until 1991. Today, 301 overlays the 240 area code.

AreaCode/Prefix (Exchange) Location
301-200 Indian Head, MD
301-208 Gaithersburg, MD
301-210 Beltsville, MD
301-216 Gaithersburg, MD
301-223 Williamsport, MD
301-228 Frederick, MD
301-232 Sandy Spring, MD
301-242 Brandywine, MD
301-245 Bittinger, MD
301-246 Nanjemoy, MD
301-247 Leonardtown, MD
301-250 Rockville, MD
301-252 Gaithersburg, MD
301-253 Damascus, MD
301-256 Laurel, MD
301-260 Ashton, MD
301-264 Mount Savage, MD
301-266 Waldorf, MD
301-268 Cumberland, MD
301-271 Thurmont, MD
301-274 Hughesville, MD
301-290 Mechanicsville, MD
301-293 Myersville, MD
301-302 Hagerstown, MD
301-304 Frederick, MD
301-305 Frederick, MD
301-310 Columbia, MD
301-317 Laurel, MD
301-323 Laurel, MD
301-329 Greenbelt, MD
301-330 Gaithersburg, MD
301-331 Hagerstown, MD
301-334 Oakland, MD
301-337 Gaithersburg, MD
301-338 Cumberland, MD
301-349 Poolesville, MD
301-355 Gaithersburg, MD
301-356 Laurel, MD
301-359 Westernport, MD
301-360 Frederick, MD
301-362 Laurel, MD
301-363 Damascus, MD
301-366 Gaithersburg, MD
301-368 Damascus, MD
301-370 Gaithersburg, MD
301-371 Middletown, MD
301-373 Hollywood, MD
301-374 Waldorf, MD
301-375 Bryans Road, MD
301-376 Laurel, MD
301-377 Laurel, MD
301-378 Frederick, MD
301-387 Swanton, MD
301-391 Damascus, MD
301-392 La Plata, MD
301-393 Hagerstown, MD
301-395 Laurel, MD
301-396 Waldorf, MD
301-399 Waldorf, MD
301-401 Frederick, MD
301-407 Poolesville, MD
301-414 Damascus, MD
301-416 Williamsport, MD
301-418 Frederick, MD
301-421 Silver Spring, MD
301-432 Keedysville, MD
301-447 Emmitsburg, MD
301-453 Kitzmiller, MD
301-462 Myersville, MD
301-463 Lonaconing, MD
301-465 Myersville, MD
301-471 Frederick, MD
301-472 Mechanicsville, MD
301-473 Frederick, MD
301-475 Leonardtown, MD
301-476 Silver Spring, MD
301-478 Oldtown, MD
301-481 Leonardtown, MD
301-482 Damascus, MD
301-483 Laurel, MD
301-487 Myersville, MD
301-490 Laurel, MD
301-491 Hagerstown, MD
301-497 Laurel, MD
301-498 Laurel, MD
301-501 Oakland, MD
301-508 Myersville, MD
301-514 Frederick, MD
301-515 Gaithersburg, MD
301-519 Gaithersburg, MD
301-524 Frederick, MD
301-525 Gaithersburg, MD
301-527 Gaithersburg, MD
301-528 Gaithersburg, MD
301-533 Oakland, MD
301-534 Indian Head, MD
301-535 Waldorf, MD
301-536 Leonardtown, MD
301-539 La Plata, MD
301-540 Gaithersburg, MD
301-542 Waldorf, MD
301-543 Laurel, MD
301-549 Laurel, MD
301-553 Waldorf, MD
301-556 Gaithersburg, MD
301-569 Gaithersburg, MD
301-570 Ashton, MD
301-573 Hagerstown, MD
301-575 Laurel, MD
301-579 Brandywine, MD
301-582 Hagerstown, MD
301-591 Gaithersburg, MD
301-596 Columbia, MD
301-597 Hancock, MD
301-600 Frederick, MD
301-604 Laurel, MD
301-606 Frederick, MD
301-607 New Market, MD
301-609 La Plata, MD
301-616 Oakland, MD
301-617 Laurel, MD
301-619 Frederick, MD
301-620 Frederick, MD
301-624 Frederick, MD
301-631 Frederick, MD
301-632 Waldorf, MD
301-635 Myersville, MD
301-638 Waldorf, MD
301-639 Frederick, MD
301-643 Waldorf, MD
301-644 Frederick, MD
301-645 Waldorf, MD
301-653 Waldorf, MD
301-658 Sandy Spring, MD
301-659 Waldorf, MD
301-660 Keedysville, MD
301-662 Frederick, MD
301-663 Frederick, MD
301-665 Hagerstown, MD
301-667 Myersville, MD
301-668 Frederick, MD
301-671 Hagerstown, MD
301-673 Frederick, MD
301-676 Frederick, MD
301-678 Hancock, MD
301-682 Frederick, MD
301-684 Indian Head, MD
301-685 Damascus, MD
301-687 Frostburg, MD
301-689 Frostburg, MD
301-690 Leonardtown, MD
301-691 Poolesville, MD
301-693 Frederick, MD
301-694 Frederick, MD
301-695 Frederick, MD
301-696 Frederick, MD
301-697 Cumberland, MD
301-698 Frederick, MD
301-703 Mount Airy, MD
301-705 Waldorf, MD
301-707 Cumberland, MD
301-708 Greenbelt, MD
301-710 Waldorf, MD
301-712 Frederick, MD
301-714 Hagerstown, MD
301-720 Brandywine, MD
301-722 Cumberland, MD
301-723 Cumberland, MD
301-724 Cumberland, MD
301-725 Laurel, MD
301-729 Cumberland, MD
301-730 Myersville, MD
301-732 Greenbelt, MD
301-733 Hagerstown, MD
301-739 Hagerstown, MD
301-740 Gaithersburg, MD
301-741 Laurel, MD
301-743 Indian Head, MD
301-744 Indian Head, MD
301-745 Hagerstown, MD
301-746 Accident, MD
301-748 Frederick, MD
301-750 Friendsville, MD
301-751 Waldorf, MD
301-752 Waldorf, MD
301-759 Cumberland, MD
301-764 Waldorf, MD
301-766 Hagerstown, MD
301-769 Avenue, MD
301-774 Ashton, MD
301-776 Laurel, MD
301-777 Cumberland, MD
301-781 Frostburg, MD
301-782 Brandywine, MD
301-783 Cumberland, MD
301-784 Cumberland, MD
301-788 Frederick, MD
301-790 Hagerstown, MD
301-791 Hagerstown, MD
301-797 Hagerstown, MD
301-798 New Market, MD
301-799 Keedysville, MD
301-800 Hagerstown, MD
301-804 Sandy Spring, MD
301-810 Monrovia, MD
301-815 Frederick, MD
301-818 Waldorf, MD
301-820 Gaithersburg, MD
301-821 Laurel, MD
301-824 Smithsburg, MD
301-829 Mount Airy, MD
301-831 Adamstown, MD
301-834 Brunswick, MD
301-835 Silver Spring, MD
301-842 Clear Spring, MD
301-845 Walkersville, MD
301-846 Frederick, MD
301-848 Waldorf, MD
301-849 Oakland, MD
301-854 Columbia, MD
301-857 Clear Spring, MD
301-859 Oxon Hill, MD
301-861 Waldorf, MD
301-865 New Market, MD
301-869 Gaithersburg, MD
301-872 Ridge, MD
301-874 Adamstown, MD
301-875 Laurel, MD
301-876 Cumberland, MD
301-882 New Market, MD
301-884 Mechanicsville, MD
301-885 Waldorf, MD
301-895 Grantsville, MD
301-898 Walkersville, MD
301-904 Leonardtown, MD
301-914 Mc Henry, MD
301-916 Poolesville, MD
301-926 Gaithersburg, MD
301-932 La Plata, MD
301-934 La Plata, MD
301-940 Silver Spring, MD
301-944 Gaithersburg, MD
301-947 Gaithersburg, MD
301-956 Rockville, MD
301-957 Laurel, MD
301-963 Gaithersburg, MD
301-964 Myersville, MD
301-969 Brunswick, MD
301-972 Gaithersburg, MD
301-974 Laurel, MD
301-977 Gaithersburg, MD
301-987 Gaithersburg, MD
301-988 Hagerstown, MD
301-990 Gaithersburg, MD
301-991 Hagerstown, MD
301-992 Hagerstown, MD
301-997 Leonardtown, MD
301-999 Silver Spring, MD