Jefferson County Ohio (Historic Districts) has 6 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Mount Pleasant Historic District, Commercial Street Historic District, North End Neighborhood Historic District, North Hill Historic District and Steubenville Commercial Historic District.
Some of the country's most noteable architects helped create the Jefferson County places including Carnegie Steel Co. and Thomas Levering. Prominent architectural styles found in Jefferson Country are Art Deco, Classical Revival and Italianate.