Sanders County Montana (Historic Districts) has 2 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Thompson Falls Hydroelectric Dam Historic District (Boundary Increase and Decrease), Thompson Falls Hydroelectric Dam Historic District, Thompson Falls Hydroelectric Dam Historic District (Boundary Increase and Decrease).
Some of the country's most noteable architects helped create the Sanders County places including William Cowles and O.E. Peppard. Prominent architectural styles found in Sanders Country are .