Belleville city, Illinois
Official LSAD Designation: Belleville city • Census GEOID: 1704845
• St. Clair County
Belleville city is an incorporated city in St. Clair County, Illinois. According to official records from the Census (2025), Belleville city had an estimated population of 40,237 residents. Official Census Bureau geographic records classify this community under LSAD designation Belleville city (GEOID 1704845).
Local Government Administration U.S. Census Bureau GMAF
City Of Belleville
Municipal
Official Title:
Finance Director
Address:
101 S ILLINOIS ST, BELLEVILLE IL 62220-2197
County Of St Clair
County
Official Title:
Auditor
Address:
10 PUBLIC SQ, BELLEVILLE IL 62220-1623
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 40,237 | 2025 |
| Median Household Income | $63,535 | 2020-2024 |
| Median Home Value | $141,300 | 2020-2024 |
| Land Area | 23.24 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).