Prehistoric cultural affiliation(s) include Effigy Mound Culture and Late Woodland dating back to 500.
Many famous people are associated with these Washington County historic places including Louis Kissel, George A. Kissel, Leander F. Frisby, Otto P. Kissel and William L. Kissel.
Some of the country's most noteable architects helped create the Washington County places including Hermann J. Gaul, E.V. & Co. Koch, Richard Philipp, R. A. Messmer, Peter Rotier, Leander F. Frisby, Robert Messmer, Lockwood Greene, simon, Louis A. and Melick, Neal A. and Frost and Granger. Prominent architectural styles found in Washington Country are Greek Revival, Queen Anne and Romanesque.