Prehistoric cultural affiliation(s) include Woodland, Mississippian, Late Prehistoric and Late Woodland dating back to 2999 BC.
Many famous people are associated with these Washington County historic places including Lewis S. Judd, Mortimer Webster, Roscoe Hersey, Captain John Oliver, Ivory McKusick and Cordenio Severance.
Some of the country's most noteable architects helped create the Washington County places including American Bridge Company of Chicag, C.A.P. Turner, Clarence H. Johnson Sr., Taylor,Jesse,Co., National Youth Administration; MHD, Nichols, Arthur R.; Olsen, Harold E., Jacob Fisher, American Bridge Co., Augustus F. Knight and John T. Cyphers. Prominent architectural styles found in Washington Country are Greek Revival, Italianate and Queen Anne.