Prairie County, Montana

Founding: 1915
Parent counties: Custer, Dawson, and Fallon
Namesake: The county's landscape
Seat: Terry (1915–)
Land area: 1,737 square miles
Population (2020): 1,088
Population (historic): 3,684 (1920); 3,941 (1930); 2,410 (1940)
Periods of population growth: pre-1920–1930; 1970s
Subdivisions: One town; one CDP
National Register listings: Three
Pre-1940 residences (estimated): 229 (34.4%)
Pre-1940 housing survival rate: 45.4%

Farm housing in disrepair (1950): 14.6%

Nonfarm housing in disrepair (1950): 15.6%

Average farmhouse value (1930): $753
Average outbuilding value (1930): $731

Average farmhouse size (1940): 4.2 rooms

Number of farms (1920): 673
Average farm size (1920): 187.4 acres
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Terry

 
Namesake: Alfred Terry, Union Army general
Founding: 1882 (post office); 1910 (incorporation)
Population (2020): 562
Population (historic): 794 (1920); 779 (1930); 1,012 (1940)
Periods of population growth: pre-1920; 1930–1950; 1970s
Pre-1940 residences (estimated): 147 (39.3%)

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