Johnstown is an unincorporated community in Calvert County, Maryland, United States.[1] The historic Preston-on-the-Patuxent house was listed on the National Register of Historic Places in 1974.[2]

References

  1. "Geographic Names Information System". Johnstown (Populated Place). U.S. Geological Survey. January 29, 2009.
  2. "National Register Information System". National Register of Historic Places. National Park Service. April 15, 2008.

38°19′44″N 76°27′49″W / 38.32889°N 76.46361°W / 38.32889; -76.46361


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