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Black Hawk County, IA
Population by Decades

Date Population Population
Change		 Annual
% Change
1900 32,399--
1910 44,86512,4663.3
1920 56,57011,7052.3
1930 69,14612,5762.0
1940 79,94610,8001.5
1950 100,44820,5022.3
1960 122,48222,0342.0
1970 132,91610,4340.8
1980 137,9615,0450.4
1990 123,798-14,163-1.1
2000 128,0124,2140.3
Source: U.S. Bureau of Census

 
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