Lemhi County, Idaho

Founding: 1869
Parent county: Idaho
Namesake: Fort Lemhi, a Mormon missionary settlement within the county
Seat: Salmon (1869–)
Land area: 4,563 square miles
Population (2020): 7,974
Population (historic): 988 (1870); 1,915 (1890); 4,786 (1910); 4,643 (1930)
Periods of population growth: pre-1870–1880; 1890–1920; 1930s; 1970s; 1990–2020
Subdivisions: Two cities
National Register listings: 15
Pre-1940 residences (estimated): 527 (10.8%)
Pre-1940 housing survival rate: 28.2%

Farm housing in disrepair (1950): 19.6%

Nonfarm housing in disrepair (1950): 22.9%

Average farmhouse value (1930): $992
Average outbuilding value (1930): $681
Average farmhouse size (1940): 4 rooms
Number of farms (1920): 535
Average farm size (1920): 144.7 acres
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Salmon

 
Namesake: The Salmon River
Founding: 1867 (platting as Salmon City); 1869 (post office); 1900 (incorporation)
Population (2020): 3,119
Population (historic): 186 (1870); 398 (1900); 1,371 (1930)
Periods of population growth: pre-1870; 1900s; 1920–1960; 1970s; 1990s
Pre-1940 residences (estimated): 210 (13%)
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Outstanding Buildings

1. *Lars Geertson Farm (1872–1883). 615 Old Lemhi Road.