Johnston City is a city in Williamson County, Illinois, home to about 3,327 people across 2.1 square miles. Its ZIP code is 62951.
Homes sold for a median of $97 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside Johnston City. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Johnston City’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | St. Louis Lambert International Airport (STL)101 miles away |
|---|---|
| Closer regional airport | Veterans Airport of Southern Illinois (MWA)7 miles away |
| Nearest city of 250,000+ | St. Louis, MO91 miles away |
| Nearest city of 1 million+ | Chicago, IL285 miles away |
Straight-line distances from the center of Johnston City; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Johnston City had 3,384 residents in the 2020 census, down 5% since 2000.
It’s the 413th largest of 1,450 towns in Illinois by population.
Williamson County grew from 27,796 residents in 1900 to 67,153 in 2020.
Williamson County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 88°F in summer, and winter lows average 23°F. About 49 inches of rain and melted snow fall in a typical year, with about 11 inches of snow.
Source: NOAA 1991–2020 climate normals, Carbondale Sewage Plt, IL weather station (15 miles away).
26,291 jobs at 1,597 businesses in Williamson County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
13 doctors and other health care providers list an office in Johnston City.
Nearest hospitals
Providers with an office here
| Primary care doctors | 3 |
|---|---|
| Dentists | 2 |
| Nurse practitioners and physician assistants | 6 |
| Chiropractors | 2 |
| Pharmacies | 1 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (1 nearby)
Libraries (1 nearby)
Theaters and performance venues (1 nearby)
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Johnston City CUSD 1, Frankln/Johnsn/Massc/Willimsn ROE. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Jefferson Elem SchoolJohnston City | Pre-K–2 | 270 | Public | 0.7 mi |
| Washington Middle SchoolJohnston City | 5–8 | 296 | Public | 0.3 mi |
| Project EchoJohnston City | 7–12 | — | Alternative Education | 1.7 mi |
| Johnston City High SchoolJohnston City | 9–12 | 328 | Public | 0.3 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.