Hagerstown, MD is currently using an area code overlay in which area codes 240 and 301 serve the same geographic area. The area code overlay was put into service on June 1, 1997 at which time area code 240 was created as an overlay of area code 301. Area code 301 originally covered the entire state of Maryland when it was put into service on June 1, 1947.
In addition to Hagerstown, MD area codes 240 and 301 serve central and western Maryland including Bethesda, College Park, Frederick, Gaithersburg, Hagerstown, Landover, Rockville, Silver Springs and Weaton-Glenmont in addition to many smaller communities northwest of Washington, D.C.
Hagerstown, MD is located in Washington County and observes the Eastern Time Zone.