Calhoun County Iowa (Vacant / Not In Use) has 2 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Rockwell City Bridge, Chicago and North Western Office Building/Passenger Depot--Lake City.
Some of the country's most noteable architects helped create the Calhoun County places including Iowa Bridge Co. and James B. Marsh. Prominent architectural styles found in Calhoun Country are Late 19th And 20th Century Revivals.