Johnsontown was a historic home located near La Plata, Charles County, Maryland, United States. It was a two-story, two-part, clapboarded frame dwelling. The house was built between 1798 and 1818. The house was extensively renovated in 1980s. Also on the property was a heavily timber-framed granary, that dated to the early-19th century, and a family cemetery. ()

It was listed on the National Register of Historic Places in 1991. It was largely destroyed by fire in May 2005, and subsequently delisted from the register in 2006 after demolition.

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