Sweetwater County Wyoming (Historic Districts) has 5 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Lucerne Valley Archaeological District, Downtown Rock Springs Historic District, Downtown Rock Springs Historic District (Boundary Increase), Green River Downtown Historic District and Wardell Court Historic Residential District.
Some of the country's most noteable architects helped create the Sweetwater County places including James Libby and Union Pacific Coal Co.. Prominent architectural styles found in Sweetwater Country are Art Deco, Bungalow/Craftsman and Classical Revival.