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County Detail
St. Clair County
County Seat:
Belleville
Previous Seats:
Kaskaskia, 1790; Cahokia, 1795; Belleville, 1814
Area:
670 square miles
Population:
1,255 (1800 census) - 270,056 (2010 census)
Named for:
Arthur St. Clair, Revolutionary War General and Northwest Territory Governor
Created on:
April 27, 1790
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