Jefferson County, IL Housing Market Brief
county · IL · score computed October 2026
What is Jefferson 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 3 of 5 (population 20,431–39,126) · comparable within its band
Where is Jefferson County, IL in its market cycle?
Jefferson 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 Jefferson 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.
Jefferson County, IL housing market data
| Metric | Value | YoY | Source |
|---|---|---|---|
| Median Sale Price | $195K | ▲ +11.2% | Redfin |
| Median Days on Market | 69 days | ▲ +32.7% | Redfin |
| Months of Supply | 4.9 | ▲ +40% | Redfin |
| Homes for Sale | 97 | ▲ +27.6% | Redfin |
| Homes Sold | 20 | ▼ -9.1% | Redfin |
| Median Price / Sq Ft | $101 | ▼ -11.5% | Redfin |
How has Jefferson County, IL’s Alpha Score moved?
Markets like Jefferson County, IL
Frequently asked questions
Is Jefferson County, IL a buyer's or seller's market?
In the scores computed October 2026, Jefferson County, IL is classified as a Balanced Market, based on its Alpha Score of 49 out of 100. The classification reflects current price, building, affordability, economic, and rental-yield conditions.
Are home prices rising or falling in Jefferson County, IL?
The median sale price in Jefferson County, IL is $195K, having risen 11.2% over the past year, according to Redfin.
How affordable is Jefferson County, IL?
Jefferson County, IL scores 89 out of 100 on affordability — relatively affordable relative to local incomes and prevailing mortgage rates compared with other counties.
What's driving Jefferson County, IL's Alpha Score?
Jefferson County, IL's strongest dimension is Rental Yield (90/100) and its weakest is Inventory Health (7/100). The Alpha Score is a weighted blend of all five dimensions.
Want the live, interactive view of Jefferson County, IL? Open the full market dashboard — charts, ZIP-level drill-down, and watchlist tracking. Explore the map or read the methodology.