Franklin County Washington (Historic Districts) has 6 places on the National Register of Historic Places including 2 places of National significance and 3 places of Statewide significance. Significant places include Palouse Canyon Archaeological District, Savage Island Archeological District, Lower Snake River Archaeological District, Tri-Cities Archaeological District and Windust Caves Archaeological District.
Prehistoric cultural affiliation(s) include Cayuse, Cascade, Windust, Numipu, Wanapum Indians, Frenchman Springs and Windust Phase dating back to 10999 BC.
Some of the country's most noteable architects helped create the Franklin County places including Earle E. MacCannell. Prominent architectural styles found in Franklin Country are Moderne.