Winnebago County Iowa has 6 places on the National Register of Historic Places including 2 places of Statewide significance. Significant places include Forest City Public Library and Round Barn, Norway Township, Lake Mills Senior High School, Thompson, Charles J., House and Winnebago County Courthouse.
Some of the country's most noteable architects helped create the Winnebago County places including C. H. Lackore, Thornwald Thorson, Kinney & Orth and Beauley & Peabody. Prominent architectural styles found in Winnebago Country are Romanesque, Colonial Revival and Late Gothic Revival.