Prehistoric cultural affiliation(s) include Nebo Hill Complex and Archaic dating back to 6999 BC.
Several famous people are associated with these Clay County historic places including Jesse James, Elbridge Arnold, George E. Claybrook and Dr. James Howard Compton.
Some of the country's most noteable architects helped create the Clay County places including Keene & Simpson, Waltus Watkins, William Jewell, William B. Ittner, J.O. Sawyer, Jackson & McIlvain, Wight & Wight, Robin A. Walker, Keene and Simpson and A.F. Haeussler. Prominent architectural styles found in Clay Country are Late 19th And 20th Century Revivals, Late Victorian and Classical Revival.