Washington County Missouri (Historic Districts) has 3 places on the National Register of Historic Places including 2 places of Statewide significance. Significant places include Caledonia Historic District and Washington State Park CCC Historic District, Palmer Historic Mining District.
The famous person Willard Duncan Vandiver is associated with one of more of the Washington County historic places.
Some of the country's most noteable architects helped create the Washington County places including CCC, Mercantile Co. and Parole Mining &. Prominent architectural styles found in Washington Country are Classical Revival and Greek Revival.
