Prehistoric cultural affiliation(s) include Middle Woodland, Early Woodland, Late Woodland, Langford Tradition and Upper Mississippian dating back to 999 BC.
Several famous people are associated with these Whiteside County historic places including Ronald Reagan and Paul Washington Dillon.
Some of the country's most noteable architects helped create the Whiteside County places including U.S. Army Corps of Engineers, R.S. Riser, George W. Ashby, Wesley Arnold, William P. Hiddleson, Keefers & Wyncoop and P. J. Van Horn. Prominent architectural styles found in Whiteside Country are Italianate, Classical Revival and Early Commercial.