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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Outstanding Buildings

  1. Alexander Earl Farm (1857). 5726 Harvey Road. Aztalan. Gothic Revival.
  2. Levi Johnson House (c. 1870). 221 Cold Springs Road. Cold Spring. Italianate.
  3. Walter Parish Farm (c. 1870). 244 Woodward Road. Cold Spring. Italianate.
  4. Leonard Schoeller House (c. 1895). 5724 North Helenville Road. Farmington. Queen Anne.
  5. Fifield House (1856). 315 East Greenwood Street. Jefferson. Italianate.
  6. St. Coletta Convent / St. Coletta Institute (1868). US Highway 18 and Road Y. Jefferson. Romanesque.
  7. Albert Shekey House (c. 1885). 7526 Koshkonong Mounds Road. Koshkonong. Stick.
  8. Asa Snell Farm (c. 1860). 2856 State Route 89. Koshkonong. Italianate.
  9. Reuben Willson Farm (1867). 1269 State Route 59. Palmyra. Italianate.
  10. Clark Farm (1885). 2860 Hardscrabble Road. Sullivan. Gothic Revival.
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