The famous person John K. Voorhees is associated with one of more of the Mahaska County historic places.
Some of the country's most noteable architects helped create the Mahaska County places including Ames Central Design Office, Jim De Reus, Frank Lloyd Wright, American Bridge Co. Illinois Steel C, Simmons, A.T., and Proudfoot, Clinton Bridge and Iron Works, Fort Wayne Bridge Works, C.W. Tracy, Bird and Rawson and IA State Hwy Comm. Iowa Bridge Co. Prominent architectural styles found in Mahaska Country are Colonial Revival, Late 19th And Early 20th Century American Movements and Italianate.