Petroleum County, Montana
Founding: 1925 Parent county: Fergus Namesake: Oil fields within the county Seat: Winnett (1925–) Land area: 1,655 square miles Population (2020): 496 Population (historic): 2,045 (1930); 1,083 (1940) Periods of population growth: 1910–1930 Subdivisions: One town Pre-1940 residences (estimated): 128 (42.4%) Pre-1940 housing survival rate: 21.8% Farm housing in disrepair (1950): 15.7% Nonfarm housing in disrepair (1950): 14.1% Average farmhouse value (1930): $514 Average outbuilding value (1930): $638 Average farmhouse size (1940): 3.8 rooms Sources of settlement: Montana, Iowa, and Minnesota _________________________________________________________________________________ Winnett Namesake: Walter Winnett, owner of the town site Founding: 1910 (platting); 1910 (post office); 1916 (incorporation) Population (2020): 188 Population (historic): 316 (1920); 408 (1930) ...