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

Images

  • st-clair-county-postcard
  • stclair-Historic American Buildings Survey Collection, Library of Congress, LC-HABS ILL 16-CHIG,3-43 of 3
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