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Rock Island County, IL
Population by Decades

Date Population Population
Change
Annual
% Change
1900 55,249--
1910 70,40415,1552.5
1920 92,29721,8932.7
1930 98,1915,8940.6
1940 113,32315,1321.4
1950 133,55820,2351.7
1960 150,99117,4331.2
1970 166,73415,7431.0
1980 165,968-7660.0
1990 148,723-17,245-1.1
2000 149,3746510.0
Source: U.S. Bureau of Census

 
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