St. Clair County, Illinois
St. Clair County is a county in Illinois. Its county FIPS code is 17163. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 17163
- Representative coordinates
- 38.470198, -89.928546
- County type
- County
- County seat or government
- Belleville
- Resident population, July 2025
- 250,708
- Land area
- 1,703.56 km²
- Water area
- 41.81 km²
- State
- Illinois
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in St. Clair County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
62059 · 62060 · 62201 · 62203 · 62204 · 62205 · 62206 · 62207 · 62208 · 62220 · 62221 · 62223 · 62225 · 62226 · 62232 · 62234 · 62236 · 62239 · 62240 · 62243 · 62254 · 62255 · 62257 · 62258 · 62260 · 62264 · 62265 · 62269 · 62282 · 62285 · 62289 · 62293 · 62294 · 62298
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Use the US government local-office directory ↗ to find the office responsible for your address. A county website has not been confidently matched here. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Belleville city, IL
- Brooklyn village, IL
- Cahokia Heights city, IL
- Caseyville village, IL
- Collinsville city, IL
- Columbia city, IL
- Darmstadt CDP, IL
- Dupo village, IL
- East Carondelet village, IL
- East St. Louis city, IL
- Fairmont City village, IL
- Fairview Heights city, IL
- Fayetteville village, IL
- Floraville CDP, IL
- Freeburg village, IL
- Hecker village, IL
- Lebanon city, IL
- Lenzburg village, IL
- Madison city, IL
- Marissa village, IL
- Mascoutah city, IL
- Millstadt village, IL
- New Athens village, IL
- New Baden village, IL
- O'Fallon city, IL
- Paderborn CDP, IL
- Rentchler CDP, IL
- St. Libory village, IL
- Sauget village, IL
- Scott AFB CDP, IL
Browse all cities, towns and communities for St. Clair County
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county at your current point, check its ZIP area, or find its physical time zone.