Polk County Oregon (Vacant / Not In Use) has 3 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Pumping Station Bridge, Cooper, James S. and Jennie M., House, Polk County Bank.
Some of the country's most noteable architects helped create the Polk County places including Dallas Water Co. and Jackson & Hutchin. Prominent architectural styles found in Polk Country are Gothic and Queen Anne.