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Rural Land
O'Brien County, IA
Population by Decades
Date
Population
Population
Change
Annual
% Change
1900
16,985
-
-
1910
17,262
277
0.2
1920
19,051
1,789
1.0
1930
18,409
-642
-0.3
1940
19,293
884
0.5
1950
18,970
-323
-0.2
1960
18,840
-130
-0.1
1970
17,522
-1,318
-0.7
1980
16,972
-550
-0.3
1990
15,444
-1,528
-0.9
2000
15,102
-342
-0.2
Source:
U.S. Bureau of Census
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