Hagerstown is a city in Washington County, Maryland, United States, and its county seat. The population was 43,527 at the 2020 census. Hage…Hagerstown is a city in Washington County, Maryland, United States, and its county seat. The population was 43,527 at the 2020 census. Hagerstown ranks as Maryland's sixth-most populous incorporated city and is the most populous city in the Maryland Panhandle.
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