Area Code: 240

240 Area Code belongs to the state of Maryland. The following cities fall under this area code: Aspen Hill, Bethesda, Bowie, Chillum, Clinton, College Park, Cumberland, Fairland, Fort Washington, Frederick, Gaithersburg, Germantown, Greenbelt, Hagerstown, Landover, Montgomery Village, North Bethesda, North Laurel, North Potomac, Olney, Oxon Hill-glassmanor, Potomac, Rockville, Silver Spring, South Laurel, St. Charles, Suitland, Waldorf, Wheaton-glenmont, White Oak. There have been a total of 20637 Numbers for this area code.