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Iroquois County, IL
Population by Decades

Date Population Population
Change
Annual
% Change
1900 38,014--
1910 35,543-2,471-0.7
1920 34,841-702-0.2
1930 32,913-1,928-0.6
1940 32,496-417-0.1
1950 32,348-1480.0
1960 33,5621,2140.4
1970 33,532-300.0
1980 32,976-556-0.2
1990 30,787-2,189-0.7
2000 31,3345470.2
Source: U.S. Bureau of Census

 
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