Williamson County, IL home prices

Williamson County, IL: the typical home is worth $158,465 as of 2026-05, up -0.0% over the past year and n/a since 2000. Listings run about $129/sq ft…

Data as of May 2026 · by the Real Estate Price Map data team · methodology & sources

1979: $85,129 → 2026: $158,465 (1.9×) pre-2000 estimated via FHFA index

Market read

At $158,465, homes in Williamson County sit 0% above the Illinois median ($158,388) and 32% below the US median ($233,954). That ranks #50 of 102 Illinois counties by price.

Prices are holding steady (-0.0% in the last year) — a balanced market.

Homes here take a while to sell — a median 64 days on the market, with 18% of listings cutting their asking price.

At 2.6× local income, that's more affordable than the typical US county (~3.8×).

Against the typical US price-to-income and price-to-rent, homes here look ~29% cheap for local incomes and rents — a relative bargain.

Buying looks cheaper than renting — ~$782/mo to buy (P&I, 20% down) vs $1,045/mo to rent.

Home value history

Zillow ZHVI, monthly from 2000 · recessions shaded. See the full 1975 history on the interactive map →

Nearby counties

Franklin County, IL ($102,486) · Johnson County, IL ($204,501) · Saline County, IL ($87,790) · Union County, IL ($153,922) · Jackson County, IL ($132,845) · Pope County, IL ($171,737)