Hancock County Iowa has 9 places on the National Register of Historic Places including 6 places of Statewide significance. Significant places include Pilot Knob State Park, Amphitheater (Area 4), Pilot Knob State Park, Observation Tower (Area 2), Pilot Knob State Park, Picnic Shelter (Area 3), Pilot Knob State Park, Portals (Area 5a) and Pilot Knob State Park, Trail Area (Area 6a--6c).
Some of the country's most noteable architects helped create the Hancock County places including Ames Central Design Office, Ames Central Design Office, Henry E. Waldron, F.W. Kinney and Gross Construction. Prominent architectural styles found in Hancock Country are Art Deco, Queen Anne and Stick/Eastlake.