Sanders County, Montana

Founding: 1905
Parent county: Missoula
Namesake: Wilbur Sanders, Montana senator
Seat: Thompson Falls (1905–)
Land area: 2,761 square miles
Population (2020): 12,400
Population (historic): 3,713 (1910); 4,903 (1920); 5,692 (1930)
Periods of population growth: pre-1910–1940; 1960–1980; 1990–2020
Subdivisions: Two cities; one town; 10 CDPs
National Register listings: 23
Pre-1940 residences (estimated): 720 (10.6%)
Pre-1940 housing survival rate: 30.6%

Farm housing in disrepair (1950): 16.7%

Nonfarm housing in disrepair (1950): 15%

Average farmhouse value (1930): $779
Average outbuilding value (1930): $636

Average farmhouse size (1940): 3.8 rooms

Number of farms (1920): 667
Average farm size (1920): 63.6 acres
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Thompson Falls

 
Namesake: David Thompson, British fur trader
Founding: 1882 (post office); 1885 (platting); 1910 (incorporation)
Population (2020): 1,336
Population (historic): 325 (1910); 508 (1920); 468 (1930)
Periods of population growth: pre-1910–1920; 1930–1980
Pre-1940 residences (estimated): 90 (14.7%)
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