Williamson County, IL Housing Market Brief
county · IL · as of August 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.
Where is Williamson County, IL in its market cycle?
Williamson County, IL is classified as Declining — cooling, with scores declining 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?
Our model forecasts Williamson County, IL’s home prices to decline about 3.0% over the next 12 months (medium confidence).
This is a separate, forward-looking view — not the cycle classification above. See how past forecasts performed on the track record, or the full local forecast with its confidence range on the market page.
Williamson County, IL housing market data
| Metric | Value | YoY |
|---|---|---|
| Median Sale Price | $166K | ▼ -19% |
| Median Days on Market | 73 days | ▲ +15.9% |
| Months of Supply | 3.6 | 0% |
| Homes for Sale | 296 | ▲ +4.2% |
| Homes Sold | 86 | ▲ +4.9% |
| Median Price / Sq Ft | $107 | ▼ -9.5% |
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?
As of August 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, inventory, 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 $166K, having fallen 19% over the past year.
How affordable is Williamson County, IL?
Williamson County, IL scores 91 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 Affordability (91/100) and its weakest is Economic Strength (39/100). 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.