Collinsville city, Illinois
Official LSAD Designation: Collinsville city • Census GEOID: 1715599
• Madison County / St. Clair County
Collinsville city is an incorporated city in Madison County, St. Clair County, Illinois. According to official records from the Census (2025), Collinsville city had an estimated population of 23,717 residents. Official Census Bureau geographic records classify this community under LSAD designation Collinsville city (GEOID 1715599).
Local Government Administration U.S. Census Bureau GMAF
City Of Collinsville
Municipal
Official Title:
Direc./treas.
Address:
125 S CENTER ST, STOP 1, COLLINSVILLE IL 62234-2797
County Of Madison
County
Official Title:
Auditor
Address:
157 N MAIN ST, RM 382, EDWARDSVILLE IL 62025-1965
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 23,717 | 2025 |
| Median Household Income | $67,612 | 2020-2024 |
| Median Home Value | $163,600 | 2020-2024 |
| Land Area | 15.42 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).