1820:        1,444
1830:        3,635
1840:      30,945
1850:    305,391
1860:    775,881
1870: 1,054,670
1880: 1,315,497
1890: 1,686,880
1900: 2,069,042
1910: 2,333,860
1920: 2,632,067
1930: 2,939,006
1940: 3,137,587
1950: 3,434,575
1960: 3,951,777
1970: 4,417,731
1980: 4,705,767
1990: 4,891,769

Breakdowns by county, race, gender and other subcategories are available from the U.S. Census at http://www.census.gov/people/

U.S. Census

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Population of Wisconsin

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Dictionary of Wisconsin History

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