Columbia city, Illinois
Official LSAD Designation: Columbia city • Census GEOID: 1715833
• Monroe County / St. Clair County
Columbia city is an incorporated city in Monroe County, St. Clair County, Illinois. According to official records from the Census (2025), Columbia city had an estimated population of 10,865 residents. Official Census Bureau geographic records classify this community under LSAD designation Columbia city (GEOID 1715833).
Local Government Administration U.S. Census Bureau GMAF
City Of Columbia
Municipal
Official Title:
Accounting Manager
Address:
208 S RAPP AVE, COLUMBIA IL 62236-2329
County Of Monroe
County
Official Title:
Treasurer
Address:
100 S MAIN ST, WATERLOO IL 62298
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 10,865 | 2025 |
| Median Household Income | $107,606 | 2020-2024 |
| Median Home Value | $293,000 | 2020-2024 |
| Land Area | 10.56 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).