Prehistoric cultural affiliation(s) include Initial Variant Middle Missouri and Big Sioux Phase dating back to 1000.
Several famous people are associated with these Plymouth County historic places including C.C. Bradley and Ralph Rippey.
Some of the country's most noteable architects helped create the Plymouth County places including H.P. Tonsfeldt, Emil Miller, John Werling, Atchison & Edbrooke, William La Barthe Steele, Kinney & Detweiler, John A. Huxtable, William LaBarthe Steele and Riesche & Sanborn. Prominent architectural styles found in Plymouth Country are Colonial Revival, Bungalow/Craftsman and Late 19th And 20th Century Revivals.