Hagerstown /ˈheɪɡərztaʊn/ HAY-gərz-town is a city in Washington County, Maryland, United States and the county seat of Washington County. The population of Hagerstown city proper at the 2020 census was 43,527, and the population of the Hagerstown metropolitan area (extending into West Virginia) was 269,140. Hagerstown ranks as Maryland's sixth-largest incorporated city and is the largest city in the Panhandle.