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Johnson County, IA
Population by Decades

Date Population Population
Change
Annual
% Change
1900 24,817--
1910 25,9141,0970.4
1920 26,4625480.2
1930 30,2763,8141.4
1940 33,1912,9150.9
1950 45,75612,5653.3
1960 53,6637,9071.6
1970 72,12718,4643.0
1980 81,7179,5901.3
1990 96,11914,4021.6
2000 111,00614,8871.5
Source: U.S. Bureau of Census

 
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