The famous person Isaac Newton Clark 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 William F. Gernandt, Nebraska Bureau of Roads & Bridges, Lincoln Construction Co., Hempel Bros., J.H. Craddock, A.W. Woods, Earl Ellis, R.W. Grant, John E. King and T.J. Fowler. Prominent architectural styles found in Clay Country are Beaux Arts, Gothic Revival and Late Gothic Revival.