Johnston City city, Illinois
Official LSAD Designation: Johnston City city • Census GEOID: 1738544
• Williamson County
Johnston City city is an incorporated city in Williamson County, Illinois. According to official records from the Census (2025), Johnston City city had an estimated population of 3,313 residents. Official Census Bureau geographic records classify this community under LSAD designation Johnston City city (GEOID 1738544).
Local Government Administration U.S. Census Bureau GMAF
City Of Johnston City
Municipal
Official Title:
Treasurer
Address:
100 W BROADWAY BLVD, JOHNSTON CITY IL 62951-1424
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 | 3,313 | 2025 |
| Median Household Income | $42,465 | 2020-2024 |
| Median Home Value | $88,100 | 2020-2024 |
| Land Area | 2.12 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).