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Lewis and Clark County, MT
Population by Decades

Date Population Population
Change
Annual
% Change
1900 19,171--
1910 21,8532,6821.3
1920 18,660-3,193-1.6
1930 18,224-436-0.2
1940 22,1313,9072.0
1950 24,5402,4091.0
1960 28,0063,4661.3
1970 33,2815,2751.7
1980 43,0399,7582.6
1990 47,4954,4561.0
2000 55,7168,2211.6
Source: U.S. Bureau of Census

 
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