Williamson County, IL Average Home Price (2026)
The average home price in Williamson County, Illinois is about $160,000 (the 2026 median across 10 ZIP codes, at ~$117/sq ft) — 19% more affordable than the Illinois median and 45% more affordable than the typical U.S. home.
How Williamson County compares
Williamson County is relatively affordable for housing nationally: its typical home costs $160,000 against $197,000 for Illinois and $289,000 for the U.S. Within the county, ZIP-level values run from about $97,000 to $198,000.
| Area | Typical value | $ / sq ft |
|---|---|---|
| Williamson County | $160,000 | $117 |
| Illinois | $197,000 | $134 |
| United States | $289,000 | $193 |
Williamson County home prices by ZIP code
The 10 most valuable ZIP codes in Williamson County (of 10 with data):
| ZIP code | Typical value | $ / sq ft | vs county |
|---|---|---|---|
| 62918 Carterville | $198,000 | $126 | +24% |
| 62922 Creal Springs | $197,000 | $190 | +23% |
| 62902 Carbondale | $195,000 | $130 | +22% |
| 62959 Marion | $183,000 | $140 | +14% |
| 62933 Energy | $168,000 | $96 | +5% |
| 62915 Cambria | $152,000 | $80 | -5% |
| 62974 Pittsburg | $148,000 | $232 | -7% |
| 62948 Herrin | $114,000 | $91 | -29% |
| 62951 Johnston City | $110,000 | $108 | -31% |
| 62949 Hurst | $97,000 | $51 | -39% |
Home value appreciation in Williamson County
Home prices in Williamson County have risen about 54% over the last 10 years (≈4.4% a year) and +70.9% over 20 years, according to the FHFA house price index through 2025. The most recent year came in at +5.0% — still rising. A home worth $160,000 today was worth roughly $103,694 ten years ago.
See where that trend takes a specific home with the home appreciation calculator — statewide, Illinois is +64.6% over the same 10 years. Past appreciation is a track record, not a forecast; local prices can fall.
Calculators for Williamson County
Run the numbers for Williamson County with the local rates already filled in — change any input to test your own situation.
Salary needed to buy a home in Williamson County
To buy the typical $160,000 home in Williamson County with 20% down, you need a household income of roughly $44,000 a year (about $1,020 a month for the mortgage, taxes, and insurance). With 10% down the bar rises to about $52,000, because the loan is bigger and mortgage insurance kicks in.
| Down payment | Cash down | Monthly payment | Income needed |
|---|---|---|---|
| 5% (+PMI) | $8,000 | $1,260/mo | $54,000/yr |
| 10% (+PMI) | $16,000 | $1,210/mo | $52,000/yr |
| 20% | $32,000 | $1,020/mo | $44,000/yr |
Assumes a 30-year fixed mortgage at 6.5%, property tax at 1.1% and insurance at 0.45% of value per year, PMI of 0.75% on loans with less than 20% down, and the standard 28% housing-to-income rule. Your rate, taxes, and HOA will move these — run your own numbers in the mortgage calculator.
What your budget buys in Williamson County
At about $117 per square foot, here is roughly how much home different budgets get you in Williamson County:
| Budget | Approx. size | What that looks like locally |
|---|---|---|
| $150k | 1280 sq ft | around the typical home here |
| $200k | 1710 sq ft | around the typical home here |
| $250k | 2140 sq ft | above the median — larger homes or the pricier ZIPs |
| $300k | 2560 sq ft | above the median — larger homes or the pricier ZIPs |
Wondering where that budget goes further? The relocation calculator ranks hundreds of U.S. cities by what the same money buys — it opens filtered to Illinois.
Estimate a specific home in Williamson County
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Williamson County home prices: frequently asked
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Browse all Illinois cities and counties, or look up price per square foot by ZIP code nationwide.
Directional estimates from public market data (Realtor.com & Zillow research; FHFA house price index; Census ZIP-to-county relationships), not appraisals.