Maryland area codes: all 6 codes and where they ring

All Maryland area codes

Source: NANPA area code report, exhaust projections and rate-centre report, file of 11/01/2026. This is not an official NANPA site.

How Maryland’s area codes began

301 covered Maryland by itself for 44 years before 410 began service in 1991.

1. 1947: 301 was among the original 1947 area codes and served Ashton 236, Ashton 238 and Bittinger.
2. 1991: 410 separated from 301 to serve Aberdeen, Annapolis and Arbutus.
3. 1997: 240 became an overlay for 301 throughout the same area.
4. 1997: 443 became an overlay for 410 throughout the same area.
5. 2012: 667 became an overlay for 443 throughout the same area.
6. 2023: 227 became an overlay for 301 throughout the same area.

Dialling inside Maryland

For 301, 410, 240, 443, 667 and 227, callers use 10-digit dialling for local calls and 1 + 10-digit dialling for long-distance calls.

Each Maryland area code and its places

One overlay area with 51 rate centres: 301, 240 and 227

Williamsport, Westernport, Washington 238, Washington 236, Washington, Walkersville, Waldorf, Tompkinsville, Thurmont, Smithsburg, Ridge, Poolesville, Oakland, New Market, Nanjemoy, Myersville, Mount Savage, Mount Airy, Middletown, Mechanicsville, Mccoole, Lonaconing, Lexington Park Great Mills, Leonardtown, Laurel 238, Laurel 236, La Plata, Kitzmiller, Keedysville, Indian Head, Hughesville, Highfield, Hancock, Hagerstown, Grantsville, Gaithersburg, Frostburg, Friendsville, Frederick, Flintstone, Emmitsburg, Damascus 240, Damascus 236, Cumberland, Clear Spring, Buckeystown, Brunswick, Brandywine, Bittinger, Ashton 236, Ashton 238.

410, 443 and 667 share one overlay area with 102 rate centres

Worthington, Woodlawn, Wingate, Willards, Westminster, West River, Waterloo 238, Waterloo 236, Warwick, Vienna, Union Bridge, Trappe, Towson, Tilghman, Taneytown, Sykesville, Sudlersville, Still Pond, Stevensville, Sparrows Point, Sparks Glencoe, Solomons, Snow Hill, Smith Island, Silver Run, Sherwood Forest, Sharptown, Severna Park, Severn, Salisbury, Saint Michaels, Rock Hall, Rising Sun, Ridgely, Reisterstown, Randallstown, Queenstown, Princess Anne, Prince Frederick, Preston, Port Deposit, Pocomoke, Pikesville, Perryville, Parkville, Parkton, Oxford, Odenton, Ocean City, North East, North Beach, New Windsor, Nanticoke, Millington, Millersville, Marion, Jarrettsville, Hurlock, Hillsboro, Havre De Grace, Hampstead, Greensboro, Glenwood, Glen Burnie, Galena, Fork, Federalsburg, Fallston, Essex, Ellicott City, Elkton, Elkridge, Edgewood, Easton, Dundalk, Denton, Delmar, Deal Island, Darlington, Crofton, Crisfield, Columbia, Cockeysville, Churchville, Church Hill, Chestertown, Chesapeake City, Chase, Centreville, Cecilton, Catonsville, Cardiff, Cambridge, Brooklyn Park Linthicum, Bishopville, Berlin, Bel Air, Baltimore, Armiger-gibson Island, Arbutus, Aberdeen, Annapolis.

Will another area code be added in Maryland?

Not for years: NANPA expects 410/443/667 to be the first group to run out, in 2036.

Area codes used across the Maryland line

• Metro Washington-Arlington-Alexandria, DC-VA-MD-WV includes Virginia codes 703, 804, 540, 571, 826 and 686. It also includes Washington DC 202, 771, West Virginia 304 and 681.
• The Philadelphia-Camden-Wilmington, PA-NJ-DE-MD area covers Pennsylvania codes 215, 717, 610, 484, 267, 223, 445 and 835, plus Delaware 302 and New Jersey 609, 856 and 640.

Area codes in states bordering Maryland

• Pennsylvania uses 215, 412, 717, 814, 610, 724, 570, 484, 267, 878, 272, 223, 445, 582 and 835
• Virginia uses 703, 804, 540, 757, 571, 434, 276, 948, 826 and 686

Cities in Maryland

Baltimore area code list.

Questions about Maryland area codes