Delaware County Iowa (Historic Districts) has 5 places on the National Register of Historic Places including 4 places of Statewide significance. Significant places include Backbone State Park Historic District, Backbone State Park, Cabin--Bathing Area (Area A), Backbone State Park, Picnicking, Hiking & Camping Area (Area B) and Backbone State Park, Richmond Springs (Area C) and Backbone State Park, Cabin--Bathing Area (Area A).
Some of the country's most noteable architects helped create the Delaware County places including Ames Central Design Office, SP17 CCC Camps SP2 and John Fitzsimmons. Prominent architectural styles found in Delaware Country are Late Victorian.
