Johnstown is an unincorporated communityinCalvert County, Maryland, United States.[1] The historic Preston-on-the-Patuxent house was listed on the National Register of Historic Places in 1974.[2]
Municipalities and communities of Calvert County, Maryland, United States
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38°19′44″N 76°27′49″W / 38.32889°N 76.46361°W / 38.32889; -76.46361
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