Johnson County, IL Housing Market Brief
county · IL · score computed October 2026
What is Johnson 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 2 of 5 (population 9,816–20,389) · comparable within its band
Where is Johnson County, IL in its market cycle?
Johnson 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 Johnson 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.
Johnson County, IL housing market data
| Metric | Value | YoY | Source |
|---|---|---|---|
| Median Sale Price | $144K | ▼ -13.8% | Redfin |
| Median Days on Market | 63 days | ▼ -28.4% | Redfin |
| Months of Supply | 8.9 | ▲ +134.2% | Redfin |
| Homes for Sale | 55 | ▲ +22.2% | Redfin |
| Homes Sold | 6 | ▼ -50% | Redfin |
| Median Price / Sq Ft | $108 | ▲ +5.2% | Redfin |
How has Johnson County, IL’s Alpha Score moved?
Markets like Johnson County, IL
- Lane County, KS, KScounty43
- Baker County, GA, GAcounty41
- Box Butte County, NE, NEcounty42
- Coshocton County, OH, OHcounty44
- Logan County, AR, ARcounty43
- Glascock County, GA, GAcounty67
- Stoddard County, MO, MOcounty45
- Renville County, ND, NDcounty50
- Logan County, NE, NEcounty57
- Washington County, MO, MOcounty42
Frequently asked questions
Is Johnson County, IL a buyer's or seller's market?
In the scores computed October 2026, Johnson County, IL is classified as a Balanced Market, based on its Alpha Score of 42 out of 100. The classification reflects current price, building, affordability, economic, and rental-yield conditions.
Are home prices rising or falling in Johnson County, IL?
The median sale price in Johnson County, IL is $144K, having fallen 13.8% over the past year, according to Redfin.
How affordable is Johnson County, IL?
Johnson County, IL scores 67 out of 100 on affordability — relatively affordable relative to local incomes and prevailing mortgage rates compared with other counties.
What's driving Johnson County, IL's Alpha Score?
Johnson County, IL's strongest dimension is Affordability (67/100) and its weakest is Inventory Health (0/100). The Alpha Score is a weighted blend of all five dimensions.
Want the live, interactive view of Johnson County, IL? Open the full market dashboard — charts, ZIP-level drill-down, and watchlist tracking. Explore the map or read the methodology.