Johnson County Iowa (Vacant / Not In Use) has 9 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include First Johnson County Asylum, Chicago, Rock Island and Pacific Railroad Passenger Station, Coralville Public School, Englert Theatre and Ford, Arthur Hillyer, House.
Some of the country's most noteable architects helped create the Johnson County places including Wiley & Son, O.H. Carpenter, F.X. Freyder, Albert Drews, Vorse, Kraitsch and & Kraitsch. Prominent architectural styles found in Johnson Country are Beaux Arts, Chicago and Italianate.