County
Saint Clair County
Illinois • United States
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Saint Clair County is a county in Illinois, United States. It has a population of about 257,400 and an area of 1,746 km². It contains 17 towns, 3 villages, and 1 city with a combined population of about 208,910. The largest are Belleville (42,034), O'Fallon (29,002), and East Saint Louis (27,006). It was established in 1790. 3 official videos are published about the United States.
- Area
- 1,746 km²
- Established
- 1790
- Official website
- co.st-clair.il.us
Referenced in
Nou ka jwenn enfòmasyon sou kote sa a, e nou ka jwenn yon sèvis ki byen òganize e ki pa gen okenn rapò ak pwodui ki fèt.
Place data from GeoNames, used under CC BY 4.0 and modified for this site.


