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Clay County, IL
Population by Decades

Date Population Population
Change
Annual
% Change
1900 19,553--
1910 18,661-892-0.5
1920 17,684-977-0.5
1930 16,155-1,529-0.9
1940 18,9472,7921.6
1950 17,445-1,502-0.8
1960 15,815-1,630-1.0
1970 14,735-1,080-0.7
1980 15,2835480.4
1990 14,460-823-0.6
2000 14,5601000.1
Source: U.S. Bureau of Census

 
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