Harrison County Ohio has 7 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Harrison County Courthouse, Deersville Historic Distirct, Franklin College Building No. 5, Harrison National Bank and Law, Henry, Farm Historic District.
Some of the country's most noteable architects helped create the Harrison County places including E.M. Long, Yost & Packard and Charles P. Hamilton. Prominent architectural styles found in Harrison Country are Colonial Revival, Gothic Revival and Greek Revival.