Washington County, Maryland

Washington County
County
Burnside's Bridge in Washington County, site of heavy combat during the Battle of Antietam
Flag Seal
Location within the U.S. state of Maryland
Maryland's location within the U.S.
Coordinates: 39°36′N 77°49′W / 39.6°N 77.81°W / 39.6; -77.81
Country	United States
State	Maryland
Founded	September 6, 1776
Named for	George Washington
Seat	Hagerstown
Largest city	Hagerstown
Area
• Total	467 sq mi (1,210 km2)
• Land	458 sq mi (1,190 km2)
• Water	9.6 sq mi (25 km2)  2.0%
Population  (2020)
• Total	154,705
• Estimate  (2023)	155,813
• Density	330/sq mi (130/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional district	6th
Website	www.washco-md.net

Washington County is a county located in the U.S. state of Maryland. The population was 154,705 as of the 2020 census.^[1] Its county seat and largest city is Hagerstown.^[2] The county is part of the Western Maryland region of the state.

Washington County was the first county in the United States to be named for the Revolutionary War general (and later President) George Washington. Washington County is one of three Maryland counties recognized by the Appalachian Regional Commission as being part of Appalachia.^[3] The county borders southern Pennsylvania to the north, Northern Virginia to the south, and the Martinsburg Panhandle of West Virginia to the south and west. Washington County is included in the Hagerstown-Martinsburg, MD-WV Metropolitan Statistical Area, which is also included in the Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area.