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Sioux County, IA
Population by Decades

Date Population Population
Change
Annual
% Change
1900 23,337--
1910 25,2481,9110.8
1920 26,4581,2100.5
1930 26,8063480.1
1940 27,2094030.1
1950 26,381-828-0.3
1960 26,375-60.0
1970 27,9961,6210.6
1980 30,8132,8171.0
1990 29,903-910-0.3
2000 31,5891,6860.6
Source: U.S. Bureau of Census

 
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