Jefferson County, Wisconsin

Founding: 1839 (declared in 1836)
Parent county: Milwaukee
Namesake: Jefferson County, New York
Seat: Jefferson (1839–)
Land area: 556 square miles
Population (2020): 84,900
Population (historic): 914 (1840); 30,438 (1860); 32,156 (1880); 34,789 (1900); 36,785 (1930)
Periods of population growth: pre-1840–1870; 1880–1900; 1910–2020
Subdivisions: Five cities; three villages; six CDPs; 16 towns
Pre-1940 residences (estimated): 8,505 (23.7%)
Pre-1940 housing survival rate: 81.8%
Pre-1860 housing survival rate (1940): 12.2%

Farm housing in disrepair (1950): 8%

Nonfarm housing in disrepair (1950): 3.7%

Average farmhouse value (1930): $2,505
Average outbuilding value (1930): $3,007

Average farmhouse size (1940): 7.4 rooms
Number of farms (1920): 3,263
Average farm size (1920): 66.8 acres
Sources of settlement: Germany, New York, Ireland, and England
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Jefferson

 
Namesake: Jefferson County, New York
Founding: 1837 (platting); 1837 (post office); 1857 (incorporation)
Population (2020): 7,793
Population (historic): 550 (1850); 2,176 (1870); 2,287 (1890); 2,582 (1910); 2,639 (1930)
Periods of population growth: pre-1850–1870; 1880–1900; 1920–2010
Pre-1940 residences (estimated): 975 (27.5%)
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