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This is an area code lookup tool.

Area Code	City	State Code
240	Allegany, Charles, Frederick, Garrett, Howard, Montgomery, Prince George's, St. Mary's, Washington	MD
301	Abell, Accident, Accokeek, Adamstown, Andrews Air Force Base, Aquasco, Ashton, Avenue, Barnesville, Barton, Beallsville, Bel Alton, Beltsville, Benedict, Bethesda, Big Pool, Bittinger, Bladensburg, Bloomington, Boonsboro, Bowie, Boyds, Braddock Heights, Brandywine, Brentwood, Brinklow, Brookeville, Brownsville, Brunswick, Bryans Road, Bryantown, Buckeystown, Burkittsville, Burtonsville, Bushwood, Cabin John, California, Callaway, Capitol Heights, Cascade, Cavetown, Chaptico, Charlotte Hall, Cheltenham, Chevy Chase, Chewsville, Clarksburg, Clear Spring, Clements, Clinton, Cobb Island, College Park, Coltons Point, Compton, Corriganville, Cumberland, Damascus, Dameron, Derwood, Dickerson, District Heights, Drayden, Eckhart Mines, Ellerslie, Emmitsburg, Fairplay, Faulkner, Flintstone, Fort Washington, Frederick, Friendship, Friendsville, Frostburg, Funkstown, Gaithersburg, Gapland, Garrett Park, Germantown, Glen Echo, Glenn Dale, Grantsville, Great Mills, Greenbelt, Hagerstown, Hancock, Helen, Highland, Hollywood, Hughesville, Hyattsville, Ijamsville, Indian Head, Ironsides, Issue, Jefferson, Keedysville, Kensington, Kitzmiller, Knoxville, La Plata, Ladiesburg, Lanham, Laurel, Leonardtown, Lexington Park, Libertytown, Little Orleans, Lonaconing, Loveville, Luke, Marbury, Maugansville, Mc Henry, Mechanicsville, Middletown, Midland, Midlothian, Monrovia, Montgomery Village, Morganza, Mount Airy, Mount Rainier, Mount Savage, Mount Victoria, Myersville, Nanjemoy, New Market, New Midway, Newburg, Oakland, Oldtown, Olney, Owings, Oxon Hill, Park Hall, Patuxent River, Piney Point, Pinto, Point Of Rocks, Pomfret, Poolesville, Port Tobacco, Potomac, Rawlings, Ridge, Riverdale, Rock Point, Rockville, Rocky Ridge, Rohrersville, Sabillasville, Saint Inigoes, Saint James, Saint Marys City, Sandy Spring, Scotland, Sharpsburg, Silver Spring, Smithsburg, Southern Md Facility, Spencerville, Spring Gap, Suburb Maryland Fac, Suitland, Swanton, Takoma Park, Tall Timbers, Temple Hills, Thurmont, Tuscarora, Unionville, Upper Marlboro, Valley Lee, Waldorf, Walkersville, Washington Grove, Welcome, Westernport, White Plains, Williamsport, Woodsboro	MD
410	Aberdeen, Aberdeen Proving Ground, Abingdon, Allen, Annapolis, Annapolis Junction, Arnold, Baldwin, Baltimore, Barclay, Barstow, Bel Air, Belcamp, Benson, Berlin, Bethlehem, Betterton, Bishops Head, Bishopville, Bivalve, Boring, Bozman, Bradshaw, Brooklandville, Broomes Island, Butler, Cambridge, Cardiff, Cecilton, Centreville, Chance, Charlestown, Chase, Chesapeake Beach, Chesapeake City, Chester, Chestertown, Childs, Church Creek, Church Hill, Churchton, Churchville, Claiborne, Clarksville, Cockeysville, Colora, Columbia, Conowingo, Cooksville, Cordova, Crapo, Crisfield, Crocheron, Crofton, Crownsville, Crumpton, Dames Quarter, Darlington, Davidsonville, Dayton, Deal Island, Deale, Delmar, Denton, Detour, Dowell, Dunkirk, Earleville, East New Market, Easton, Eden, Edgewater, Edgewood, Elk Mills, Elkridge, Elkton, Ellicott City, Ewell, Fallston, Federalsburg, Finksburg, Fishing Creek, Forest Hill, Fork, Fort George G Meade, Fort Howard, Freeland, Fruitland, Fulton, Galena, Galesville, Gambrills, Garrison, Georgetown, Gibson Island, Girdletree, Glen Arm, Glen Burnie, Glenelg, Glenwood, Glyndon, Goldsboro, Golts, Grasonville, Greensboro, Gunpowder, Hampstead, Hanover, Harmans, Harwood, Havre De Grace, Hebron, Henderson, Henryton, Hillsboro, Hunt Valley, Huntingtown, Hurlock, Hydes, Ingleside, Jarrettsville, Jessup, Joppa, Kennedyville, Keymar, Kingsville, Lineboro, Linkwood, Linthicum Heights, Linwood, Lisbon, Long Green, Lothian, Lusby, Lutherville Timonium, Lynch, Madison, Manchester, Manokin, Mardela Springs, Marion Station, Marriottsville, Marydel, Maryland Line, Massey, Mayo, Mcdaniel, Millers, Millersville, Millington, Monkton, Nanticoke, Neavitt, New Windsor, Newark, Newcomb, North Beach, North East, Ocean City, Odenton, Owings Mills, Oxford, Parkton, Parsonsburg, Pasadena, Perry Hall, Perry Point, Perryman, Perryville, Phoenix, Pittsville, Pocomoke City, Port Deposit, Port Republic, Powellville, Preston, Price, Prince Frederick, Princess Anne, Pylesville, Quantico, Queen Anne, Queenstown, Randallstown, Rehobeth, Reisterstown, Rhodesdale, Riderwood, Ridgely, Rising Sun, Riva, Rock Hall, Royal Oak, Saint Leonard, Saint Michaels, Salisbury, Savage, Secretary, Severn, Severna Park, Shady Side, Sharptown, Sherwood, Showell, Simpsonville, Snow Hill, Solomons, Sparks Glencoe, Stevenson, Stevensville, Still Pond, Stockton, Street, Sudlersville, Sunderland, Sykesville, Taneytown, Taylors Island, Templeville, Tilghman, Toddville, Tracys Landing, Trappe, Tyaskin, Tylerton, Union Bridge, Upper Fairmount, Upper Falls, Upper Hill, Upperco, Vienna, Warwick, Wenona, West Friendship, West River, Westminster, Westover, Whaleyville, White Hall, White Marsh, Whiteford, Willards, Wingate, Wittman, Woodbine, Woodstock, Woolford, Worton, Wye Mills	MD
443	Anne Arundel, Baltimore City, Baltimore County, Calvert, Caroline, Carroll, Cecil, Dorchester, Harford, Howard, Kent, Queen Anne's, Somerset, Talbot, Wicomico, Worcester	MD