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St. Clair County, IL
Population by Decades
Date
Population
Population
Change
Annual
% Change
1900
86,685
-
-
1910
119,870
33,185
3.3
1920
136,520
16,650
1.3
1930
157,775
21,255
1.5
1940
166,899
9,124
0.6
1950
205,995
39,096
2.1
1960
262,509
56,514
2.5
1970
285,176
22,667
0.8
1980
267,531
-17,645
-0.6
1990
262,852
-4,679
-0.2
2000
256,082
-6,770
-0.3
Source:
U.S. Bureau of Census
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