Geographic reference
St. Clair County, Illinois
St. Clair County is a county or county-equivalent in Illinois.
Reference details
- State
- Illinois (IL)
- Census GEOID
- 17163
- Land area
- 1,703.56 km²
- Water area
- 41.81 km²
- Representative point
- 38.470198, -89.928546
View point on map ↗
Geographic facts: 2026 U.S. Census Gazetteer. Coordinates identify a representative point, not the full geographic boundary.