Prehistoric cultural affiliation(s) include Central Plains Tradition and Nebraska Phase dating back to 1000.
Several famous people are associated with these Washington County historic places including Christopher Columbus Crowell Jr. and Abraham Castetter.
Some of the country's most noteable architects helped create the Washington County places including H.J. Carpenter, C.F. Driscoll, George Sutherland, John Latenser Sr., Fisher and Lawrie and O.H. Placey. Prominent architectural styles found in Washington Country are Queen Anne, Colonial Revival and Second Empire.