County Quick Reference | |
County Seat: Cahokia | County Name: Named for Arthur St. Clair, first Governor of the Territory Northwest of the River Ohio |
Boundary Changes (click on the name of a change to see more information) | |||||||||||||||||||||||||||
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Background (general information on the area to put it in the context of history)
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St. Clair County was formed on 27 April 1790 by proclamation of the Governor of the Territory Northwest of the River Ohio [click here for more information]. It became a county with Indiana Territory on 01 JUL 1800 by An act to divide the territory of the United States north-west of the Ohio, into two separate governments [click here for more information]. St. Clair County moved to the Illinois Territory on 01 March 1809 by An Act for dividing the Indiana Territory into two separate governments [click here for more information]. The county's boundaries would change five times before statehood.
The following map shows the original size of the county at its founding (in red with yellow border) superimposed on a modern map.
St. Clair County in 1809 |
Census (click on a year below to view information on the population of the area)
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Date | Population | Change |
1818 | 2,939 | --- |
Bibliography (click on the title of the following works to learn more about life in the area; for those items not available online, check with your local library for availability)
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Related Content (the links below contain information related to this area) |
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