Marion city, Illinois
Official LSAD Designation: Marion city • Census GEOID: 1746916
• Williamson County
Marion city is an incorporated city in Williamson County, Illinois. According to official records from the Census (2025), Marion city had an estimated population of 17,148 residents. Official Census Bureau geographic records classify this community under LSAD designation Marion city (GEOID 1746916).
Local Government Administration U.S. Census Bureau GMAF
City Of Marion
Municipal
Official Title:
Assistant Treasurer
Address:
1102 TOWER SQUARE PLZ, STE 7, MARION IL 62959-2605
County Of Williamson
County
Official Title:
Administrator
Address:
407 N MONROE ST STE 119, MARION IL 62959-2321
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 17,148 | 2025 |
| Median Household Income | $56,912 | 2020-2024 |
| Median Home Value | $158,300 | 2020-2024 |
| Land Area | 14.34 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).