Williamson County, IL Housing Market Brief
county · IL · score computed October 2026
What is Williamson County, IL’s Alpha Score?
The Alpha Score is a composite 0–100 index of market strength, a weighted blend of five dimensions. See the methodology.
Population band 4 of 5 (population 39,232–102,612) · comparable within its band
Where is Williamson County, IL in its market cycle?
Williamson County, IL is classified as Growing — strengthening, with scores rising over recent months. This is a classification of recent (1–12 month) momentum, not a price forecast.
What’s the forecast for Williamson County, IL?
County-level forecasts are paused (since Oct 18, 2026). The new public-data model we built to replace them didn't pass our accuracy test, and we won't publish forecasts again until a model does.
Williamson County, IL housing market data
| Metric | Value | YoY | Source |
|---|---|---|---|
| Median Sale Price | $232K | ▲ +17.1% | Redfin |
| Median Days on Market | 68 days | ▲ +13.3% | Redfin |
| Months of Supply | 4.8 | ▲ +33.3% | Redfin |
| Homes for Sale | 321 | ▲ +15.9% | Redfin |
| Homes Sold | 67 | ▼ -13% | Redfin |
| Median Price / Sq Ft | $132 | ▲ +10.4% | Redfin |
How has Williamson County, IL’s Alpha Score moved?
Markets like Williamson County, IL
Frequently asked questions
Is Williamson County, IL a buyer's or seller's market?
In the scores computed October 2026, Williamson County, IL is classified as a Balanced Market, based on its Alpha Score of 58 out of 100. The classification reflects current price, building, affordability, economic, and rental-yield conditions.
Are home prices rising or falling in Williamson County, IL?
The median sale price in Williamson County, IL is $232K, having risen 17.1% over the past year, according to Redfin.
How affordable is Williamson County, IL?
Williamson County, IL scores 76 out of 100 on affordability — relatively affordable relative to local incomes and prevailing mortgage rates compared with other counties.
What's driving Williamson County, IL's Alpha Score?
Williamson County, IL's strongest dimension is Rental Yield (79/100) and its weakest is Economic Strength (41/100). The Alpha Score is a weighted blend of all five dimensions.
Want the live, interactive view of Williamson County, IL? Open the full market dashboard — charts, ZIP-level drill-down, and watchlist tracking. Explore the map or read the methodology.