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Grundy County, IL
Population by Decades

Date Population Population
Change
Annual
% Change
1900 24,136--
1910 24,162260.0
1920 18,580-5,582-2.6
1930 18,678980.1
1940 18,398-280-0.2
1950 19,2178190.4
1960 22,3503,1331.5
1970 26,5354,1851.7
1980 30,5824,0471.4
1990 32,3371,7550.6
2000 37,5355,1981.5
Source: U.S. Bureau of Census

 
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