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Polk County, IA
Population by Decades

Date Population Population
Change
Annual
% Change
1900 82,624--
1910 110,43827,8142.9
1920 154,02943,5913.4
1930 172,83718,8081.2
1940 195,83522,9981.3
1950 226,01030,1751.4
1960 266,31540,3051.7
1970 286,10119,7860.7
1980 303,17017,0690.6
1990 327,14023,9700.8
2000 374,60147,4611.4
Source: U.S. Bureau of Census

 
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