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Rural Land
Polk County, IA
Population by Decades
Date
Population
Population
Change
Annual
% Change
1900
82,624
-
-
1910
110,438
27,814
2.9
1920
154,029
43,591
3.4
1930
172,837
18,808
1.2
1940
195,835
22,998
1.3
1950
226,010
30,175
1.4
1960
266,315
40,305
1.7
1970
286,101
19,786
0.7
1980
303,170
17,069
0.6
1990
327,140
23,970
0.8
2000
374,601
47,461
1.4
Source:
U.S. Bureau of Census
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