Prehistoric cultural affiliation(s) include Mississippian, Middle Mississippian, Late Woodland and Early Mississippian dating back to 500.
Many famous people are associated with these St. Clair County historic places including Gustave Koerner, Major Nicholas Jarrot, Charles Dickens, Gov. Augustus Chaplin French and Malburn Stephens.
Some of the country's most noteable architects helped create the St. Clair County places including Capt. James B. Eads, Albert Kahn, Capt. Clinton Edgar, Kenneth Franzheim, Heirich Rutter, A.B. Frankel, Boller Bros., Wimmer Contracting Company, Albert B. Frankel and George Jr. Draser. Prominent architectural styles found in St. Clair Country are Queen Anne, Colonial and Greek Revival.