Johnston City, Illinois.
Typical home $110,268 (-0.4% in a year). Carbondale-Marion, IL metro.
to buy the typical home at today's mortgage rate — +$229 (+66%) since Jan 2020.
- 1 year
- Down $424 -0%
- $110,692$110,268 since Sep 2025
- 5 years
- Up $10,414 +10%
- $99,854$110,268 since Sep 2021
Monthly payment to buy the typical home
Home value × that month's 30-year mortgage rate, 20% down, principal and interest. This is the line households feel: prices and rates compound each other.
- Johnston City$579
- Illinois$1,553
- United States$1,922
At the last five years' pace, a typical home here doubles in price every 35 years.
Typical home values in Johnston City, IL fell 0.4% over the past year — slower than the nation's +1.2%.
Living in Johnston City, Williamson County, Illinois
Johnston City is a city of 3,384 people in Williamson County. Unemployment in Williamson County was 3.6% in August 2026, and the county had 3.9% more jobs in 2025 than the year before. The most people in Williamson County work in schools and health care, then shops.
Written by AI Claude Sonnet 5.5 wrote this on 23 October 2026 from the figures here, a list of nearby places and what it knows. It can be wrong or out of date.
What it’s like
The place. Johnston City is a small city in Williamson County, Illinois, where most people know one another and daily errands are close at hand. Many residents live on incomes below the county's, and the typical home is modest in price. Winters are cold, with some snow, and summers turn quite warm, with plenty of rain and melted snow across the year.
Work. Residents work mostly in schools, hospitals and social care, in shops, in manufacturing, and in banks, insurance and property. Across Williamson County, some of the largest workplaces are Aisin MFG. Illinois, the Veterans Health Administration and Herrin Hospital. The drive to work is short, and very few people work from home.
Things to do. For time outdoors, Shawnee National Forest is a protected area a longer drive away, and Giant City State Park is another protected area at a similar distance. Rend Lake, a reservoir, is also a longer drive away, and it suits an outing by the water. Together they give plenty of woods, bluffs and shoreline to explore within reach of town.
Report a mistake
- 1,449households
- 19%of adults have a degree
- 18%below the poverty line
- 14 mintypical commute
- 3%work from home
What people in Williamson County work in
Employed residents by industry, from the Census survey. Williamson County had 29,573 jobs in 2025, 3.9% more than the year before (Bureau of Labor Statistics).
Weather through the year
Coldest in January, with highs near 41° and lows near 23°; warmest in July, with highs near 88° and lows near 68°. About 11 inches of snow and 49 inches of rain and melted snow a year.
Average daily high and low, 1991–2020, at the Carbondale Sewage Plt weather station, 14 miles away (NOAA).
Largest workplaces in Williamson County
- Aisin Mfg. IllinoisSunroofs and parts, automotive, truck, and bus, manufacturing1,238
- Veterans Health AdministrationFederal government · Department of Veterans Affairs1,072
- Herrin HospitalGeneral hospital743FTE
- Marion CUSD 2School district523FTE
- Aisin Light MetalsBumpers and bumperettes assembled, automotive, truck, and bus, manufacturing400
- General DynamicsAmmunition loading and assembling plants398
- WalmartWarehouse clubs and supercenters396
- John A Logan CollegeTwo-year college388
Staff on average in 2025, as each workplace reported it to OSHA with its injury records: 65 workplaces with 20 or more staff, 9,335 people in all across the county; Johnston City has one of its own. Federal offices come from OPM's federal workforce data (2026), hospitals from their Medicare cost reports (CMS, 2023), school districts from the Common Core of Data (NCES, 2023–24) and colleges from IPEDS (NCES, 2023–24); FTE marks full-time equivalent staff. Not listed: many offices and banks, which need not report to OSHA; military bases, whose staff OPM withholds; and, in about half the states, city and county governments.
Natural hazards
- Strong windVery high
- Winter weatherRelatively high
- Cold wavesRelatively high
- Heat wavesRelatively high
- EarthquakesRelatively high
- TornadoesRelatively high
FEMA’s National Risk Index (December 2025) rates the risk each natural hazard poses to the people, buildings and farms in Johnston City’s census tracts, against the rest of the country; all of them together, relatively high. It is meant for planning, not a substitute for a local risk assessment or a flood map: FEMA’s index.
From the U.S. Census Bureau’s 2020 census and its American Community Survey (2020–2024 five-year estimates), and the Bureau of Labor Statistics. A survey, so each figure has a margin of error, and figures it is not sure of are left out. More on Williamson County and the Carbondale-Marion, IL metro.
Johnston City home values
Zillow measures a city over its municipal boundary. Against the state and national figures, mid-tier homes, smoothed and seasonally adjusted.
- Johnston City$110,268
- Illinois$295,943
- United States$366,157
Levy by levy, and a check of one home’s own bill, the site covers Ohio’s property tax.
When this market ran hot
Each cell is that month's year-on-year home-value growth. Read left to right, top row is the latest year — the 2021–22 band is the boom.
Market heat, inside the city limits
Homes for sale
Active for-sale inventory. More supply hands power to buyers.
- Johnston City13
New listings per month
Sellers arriving at the market.
Not enough data to draw this yet.
Zip codes with a Johnston City address
A different geography, not a breakdown. The figure above covers the municipality; these zips cover everywhere the Post Office calls Johnston City — often including townships beyond the city limits. Both come straight from Zillow, and they are not expected to average out.