Jefferson County Louisiana (Historic Districts) has 2 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Barataria Unit of Jean Lafitte Historical Park Historic District, Gretna Historic District.
Prehistoric cultural affiliation(s) include Mississippian, Coles Creek and Plaquemines dating back to 999 BC. Prominent architectural styles found in Jefferson Country are Bungalow/Craftsman.