Area Code 240 - Maryland, District of Columbia
Cities: Ridge, Rockville, Glenn Dale, Damascus, La Plata, Indian Head, Waldorf, Oakland, Mechanicsville, Frederick, Hagerstown, Nanjemoy, Newburg, Poolesville, Mount Rainier, Oxon Hill, Laurel, Hughesville, Bethesda, Tall Timbers, Leonardtown, College Park, Kensington, Gaithersburg, Clinton, Brandywine, Highfield, Hyattsville, Beltsville, Upper Marlboro, Grantsville, Baltimore, Frostburg, Hancock, Thurmont, Silver Spring, Capitol Heights, Emmitsburg, Mccoole, Ashton, Pikesville, Cumberland, Williamsport, Mount Airy, Odenton, Ijamsville, Myersville, Wshngtnzn3, Washington, Chevy Chase, Middletown, Wasz 10 - Rockville, Temple Hills, Greenbelt, Adamstown, Lexington Park, Smithsburg, Damascs236