Ravalli County Montana (Historic Districts) has 3 places on the National Register of Historic Places including 1 place of National significance. Significant places include Rocky Mountain Laboratory Historic District, Hamilton Commercial Historic District, Hamilton Southside Residential Historic District.
Some of the country's most noteable architects helped create the Ravalli County places including A.J. Gibson and H.E. Kirkemo. Prominent architectural styles found in Ravalli Country are Colonial Revival, Bungalow/Craftsman and Mission/Spanish Revival.