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Clay County, IA
Population by Decades

Date Population Population
Change
Annual
% Change
1900 13,401--
1910 12,766-635-0.5
1920 15,6602,8942.1
1930 16,1074470.3
1940 17,7621,6551.0
1950 18,1033410.2
1960 18,5044010.2
1970 18,464-400.0
1980 19,5761,1120.6
1990 17,585-1,991-1.1
2000 17,372-213-0.1
Source: U.S. Bureau of Census

 
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