Prehistoric cultural affiliation(s) include Late Woodland and Effigy Mound dating back to 500.
The famous person Louis Kissel 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 Richard Philipp, Hermann J. Gaul, P. Mueller and John Ratenbach. Prominent architectural styles found in Washington Country are Bungalow/Craftsman, Greek Revival and Italianate.