Prehistoric cultural affiliation(s) include St. John'S Ib and St. Johns Iia dating back to 999 BC.
The famous person J.C. Penny is associated with one of more of the Clay County historic places.
Some of the country's most noteable architects helped create the Clay County places including James Gurren, A.E. McClure, Charles F. Barthlow, Lawrence & Adams Lewis, William Clarke, William Helffrich, Joseph Green, Gallespie & North, Mark & Sheftall and Alan B. Mills. Prominent architectural styles found in Clay Country are Colonial Revival, Bungalow/Craftsman and Late Gothic Revival.