The famous person Amplias Hale Avery 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 W.C. Barton, Clinton Bridge & Iron Works, Seymour Ross, Geiger Construction Co., Ames Central Design Office, J. G. Ralston, P. & A.P. Kirchner and John D. Chubb. Prominent architectural styles found in Clay Country are Classical Revival, Art Deco and Late Victorian.