Ross County Ohio (Historic Districts) has 8 places on the National Register of Historic Places including 1 place of National significance and 6 places of Statewide significance. Significant places include Mound City Group National Monument, Chillicothe Business District, Chillicothe's Old Residential District, Grandview Cemetery and Great Seal Park Archeological District.
Prehistoric cultural affiliation(s) include Adena, Archaic and Hopewell dating back to 8999 BC.
Some of the country's most noteable architects helped create the Ross County places including John Cook. Prominent architectural styles found in Ross Country are Greek Revival, Mid 19th Century Revival and Classical Revival.