Williamson County, IL Housing Market Brief
county · IL · as of May 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 Growing — strengthening, with scores rising over recent months. This is a classification of recent (1–12 month) momentum, not a price forecast.
Williamson County, IL housing market data
| Metric | Value | YoY |
|---|---|---|
| Median Sale Price | $215K | ▲ +19.4% |
| Median Days on Market | 65 days | ▲ +10.2% |
| Months of Supply | 4.1 | ▲ +10.8% |
| Homes for Sale | 269 | ▼ -2.2% |
| Homes Sold | 66 | ▼ -12% |
| Median Price / Sq Ft | $129 | ▲ +8.7% |
| Sale-to-List Ratio | 97.7% | ▼ -0.2% |
How has Williamson County, IL’s Alpha Score moved?
Markets like Williamson County, IL
- Mississippi County, AR, ARcounty62
- Kay County, OK, OKcounty63
- Buena Vista County, IA, IAcounty62
- Tattnall County, GA, GAcounty62
- Mitchell County, GA, GAcounty67
- Orange County, IN, INcounty62
- Oswego County, NY, NYcounty61
- Clinton County, IN, INcounty61
- Independence County, AR, ARcounty63
- Somerset County, PA, PAcounty60
Frequently asked questions
Is Williamson County, IL a buyer's or seller's market?
As of May 2026, Williamson County, IL is classified as a Seller's Market, based on its Alpha Score of 61 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 $215K, having risen 19.4% over the past year.
How affordable is Williamson County, IL?
Williamson County, IL scores 78 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 (83/100) and its weakest is Inventory Health (46/100). 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.