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Lake County, IL
Population by Decades

Date Population Population
Change
Annual
% Change
1900 34,504--
1910 55,05820,5544.8
1920 74,28519,2273.0
1930 104,38730,1023.5
1940 121,09416,7071.5
1950 179,09758,0034.0
1960 293,656114,5595.1
1970 382,63888,9822.7
1980 440,37257,7341.4
1990 516,41876,0461.6
2000 644,356127,9382.2
Source: U.S. Bureau of Census

 
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