St. Clair County, IL Average Home Price (2026)
The average home price in St. Clair County, Illinois is about $180,000 (the 2026 median across 21 ZIP codes, at ~$135/sq ft) — 9% more affordable than the Illinois median and 38% more affordable than the typical U.S. home.
How St. Clair County compares
St. Clair County is relatively affordable for housing nationally: its typical home costs $180,000 against $197,000 for Illinois and $289,000 for the U.S. Within the county, ZIP-level values run from about $39,000 to $312,000.
| Area | Typical value | $ / sq ft |
|---|---|---|
| St. Clair County | $180,000 | $135 |
| Illinois | $197,000 | $134 |
| United States | $289,000 | $193 |
Cities in St. Clair County
Cities with their own home-value page, largest first:
St. Clair County home prices by ZIP code
The 15 most valuable ZIP codes in St. Clair County (of 21 with data):
| ZIP code | Typical value | $ / sq ft | vs county |
|---|---|---|---|
| 62269 O Fallon | $312,000 | $162 | +73% |
| 62285 Smithton | $309,000 | $162 | +72% |
| 62282 Saint Libory | $300,000 | $158 | +67% |
| 62260 Millstadt | $296,000 | $181 | +64% |
| 62243 Freeburg | $266,000 | $171 | +48% |
| 62258 Mascoutah | $259,000 | $182 | +44% |
| 62221 Belleville | $251,000 | $141 | +39% |
| 62254 Lebanon | $208,000 | $136 | +16% |
| 62208 Fairview Heights | $194,000 | $174 | +8% |
| 62226 Belleville | $182,000 | $129 | +1% |
| 62223 Belleville | $180,000 | $119 | +0% |
| 62264 New Athens | $161,000 | $95 | -11% |
| 62220 Belleville | $153,000 | $104 | -15% |
| 62232 Caseyville | $141,000 | $172 | -22% |
| 62239 Dupo | $131,000 | $113 | -27% |
Home value appreciation in St. Clair County
Home prices in St. Clair County have risen about 69% over the last 10 years (≈5.4% a year) and +55.6% over 20 years, according to the FHFA house price index through 2025. The most recent year came in at +5.3% — still rising. A home worth $180,000 today was worth roughly $106,320 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 St. Clair County
Run the numbers for St. Clair County with the local rates already filled in — change any input to test your own situation.
Salary needed to buy a home in St. Clair County
To buy the typical $180,000 home in St. Clair County with 20% down, you need a household income of roughly $49,000 a year (about $1,140 a month for the mortgage, taxes, and insurance). With 10% down the bar rises to about $58,000, because the loan is bigger and mortgage insurance kicks in.
| Down payment | Cash down | Monthly payment | Income needed |
|---|---|---|---|
| 5% (+PMI) | $9,000 | $1,420/mo | $61,000/yr |
| 10% (+PMI) | $18,000 | $1,360/mo | $58,000/yr |
| 20% | $36,000 | $1,140/mo | $49,000/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 St. Clair County
At about $135 per square foot, here is roughly how much home different budgets get you in St. Clair County:
| Budget | Approx. size | What that looks like locally |
|---|---|---|
| $150k | 1110 sq ft | around the typical home here |
| $200k | 1480 sq ft | around the typical home here |
| $250k | 1850 sq ft | above the median — larger homes or the pricier ZIPs |
| $300k | 2220 sq ft | above the median — larger homes or the pricier ZIPs |
| $400k | 2960 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 St. Clair County
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St. Clair 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.