Hill County Montana (Historic Districts) has 2 places on the National Register of Historic Places including 1 place of National significance and 1 place of Statewide significance. Significant places include Fort Assinniboine and Fort Assinniboine, Fort Assinniboine, Havre Residential Historic District.
Some of the country's most noteable architects helped create the Hill County places including Col. J.G.C. Lee and L.K. Devlin. Prominent architectural styles found in Hill Country are Bungalow/Craftsman, Colonial Revival and Queen Anne.