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| Name | St. Clair |
| Alt names | Saint Clair | source: Getty Vocabulary Program | | Saint Clair county | source: Getty Vocabulary Program | | St. Clair | source: Family History Library Catalog |
| Type | County |
| Coordinates | 38.55°N 89.917°W |
| Located in | Illinois, United States (1790 - ) |
| See also | Bond, Illinois, United States | Child county (source: Source:Population of States and Counties of the United States: 1790-1990) | | Clark, Illinois, United States | Child county (source: Source:Population of States and Counties of the United States: 1790-1990) | | Crawford, Illinois, United States | Child county (source: Source:Population of States and Counties of the United States: 1790-1990) | | Jefferson, Illinois, United States | Child county (source: Source:Population of States and Counties of the United States: 1790-1990) | | Madison, Illinois, United States | Child county (source: Source:Population of States and Counties of the United States: 1790-1990) | | Monroe, Illinois, United States | Child county (source: Source:Population of States and Counties of the United States: 1790-1990) | | Washington, Illinois, United States | Child county (source: Source:Population of States and Counties of the United States: 1790-1990) |
- source: Getty Thesaurus of Geographic Names
- source: Family History Library Catalog
- the text in this section is copied from an article in Wikipedia
St. Clair County is the oldest county in Illinois; its western border is formed by the Mississippi River, bordering Missouri. It is a part of the Metro East in southern Illinois. According to the 2020 United States Census, it had a population of 257,400, making it the eighth-most populous county in Illinois and the most populous in the southern portion of the state. Its county seat is Belleville. The county was founded in 1790 by the government of the Northwest Territory, from the western half of Knox County, before the establishment of Illinois as a state as the base for the Illinois Territory. Cahokia Village in the county was founded in 1697 and was a French settlement and former Jesuit mission.
St. Clair County is part of the American Bottom or Metro-East area of the St. Louis, MO-IL Metropolitan Statistical Area.
In 1970, the United States Census Bureau placed the mean center of U.S. population in St. Clair County.
Timeline
| Date | Event | Source
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| 1763 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1772 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1778 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1786 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1790 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1810 | First census | Source:Population of States and Counties of the United States: 1790-1990
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| 1830 | Birth records recorded | Source:Red Book: American State, County, and Town Sources
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| 1830 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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Population History
- source: Source:Population of States and Counties of the United States: 1790-1990
| Census Year | Population
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| 1800 | 1,355
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| 1810 | 5,007
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| 1820 | 5,253
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| 1830 | 7,078
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| 1840 | 13,631
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| 1850 | 20,180
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| 1860 | 37,694
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| 1870 | 51,068
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| 1880 | 61,806
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| 1890 | 66,571
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| 1900 | 86,685
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| 1910 | 119,870
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| 1920 | 136,520
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| 1930 | 157,775
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| 1940 | 166,899
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| 1950 | 205,995
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| 1960 | 262,509
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| 1970 | 285,176
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| 1980 | 267,531
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| 1990 | 262,852
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Note: Total for 1800 comprises the populations reported for Randolph and St. Clair Counties, Indiana Territory, plus the population (100) of Opee (Peoria), included with St. Clair County. Total for 1890 includes 1 Indian in prison, not reported by county.
Cemeteries
Cemeteries of St. Clair County, Illinois, United States
Research Tips
An exemplary local society site, full of on-line resources and leads to off-line information: St. Clair County Genealogical Society --Hh219 07:41, 28 April 2007 (MDT)
External Links
- Outstanding guide to St. Clair County family history and genealogy resources (FamilySearch Research Wiki). Birth, marriage, and death records, censuses, wills, deeds, county histories, cemeteries, churches, naturalizations, newspapers, libraries, and genealogical societies.
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