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Johnson County, KS
Population by Decades

Date Population Population
Change
Annual
% Change
1900 18,104--
1910 18,2881840.1
1920 18,314260.0
1930 27,1798,8654.0
1940 33,3276,1482.1
1950 62,78329,4566.5
1960 143,79281,0098.6
1970 217,66273,8704.2
1980 270,26952,6072.2
1990 355,05484,7852.8
2000 451,08696,0322.4
Source: U.S. Bureau of Census

 
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