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Contra Costa County, CA
Population by Decades

Date Population Population
Change		 Annual
% Change
1900 18,046--
1910 31,67413,6285.8
1920 53,88922,2155.5
1930 78,60824,7193.8
1940 100,45021,8422.5
1950 298,984198,53411.5
1960 409,030110,0463.2
1970 558,389149,3593.2
1980 656,38097,9911.6
1990 803,732147,3522.0
2000 948,816145,0841.7
Source: U.S. Bureau of Census

 
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