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Washington County, OR
Population by Decades

Date Population Population
Change
Annual
% Change
1900 14,467--
1910 21,5227,0554.1
1920 26,3764,8542.1
1930 30,2753,8991.4
1940 39,1948,9192.6
1950 61,26922,0754.6
1960 92,23730,9684.2
1970 157,92065,6835.5
1980 245,80887,8884.5
1990 311,55465,7462.4
2000 445,342133,7883.6
Source: U.S. Bureau of Census

 
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