Williamson County, Illinois

Tax Lien67,064 residents

County research last verified 2026-07. Office holders, platforms, and deposit rules change — re-confirm anything time-sensitive.

Sale typestate default

Tax Lien

Redemption periodstate default

2–2.5 years depending on property type

Investor returnstate default

Up to 36% penalty per 6-month period (bid-down), 18% max per period at auction

Governing statutestate default

35 ILCS 200, Art. 21

Notes

Illinois downstate tax-lien county. Williamson County (Marion / Carbondale fringe) Treasurer sells delinquent taxes annually — registration historically mid-January through mid-February for a late-February sale (e.g. Feb 26, 2026 cycle for prior year; 2025 payable 2026 date TBD on treasurer PDFs). $500 deposit pattern and reverse-interest bidding from 18% appear in county sale packets — confirm current packet (618-998-2142 x5662). Tax deed / scavenger-style sealed bids also appear via ILTaxSaleBids.com / Joseph E. Meyer listings (e.g. Nov 6, 2026 sealed-bid catalog). Southern Illinois mining, floodplain, and slower appreciation require conservative ARV assumptions.

Auction logistics

Format

In-person annual tax sale (Treasurer) plus separate sealed-bid tax deed offerings as posted

Frequency

Annual collector’s tax sale (winter/early spring pattern) plus periodic tax deed sealed bids (e.g. November catalogs); confirm each year

Platform

Williamson County Treasurer tax sale / ILTaxSaleBids.com sealed bids ↗

Deposit rules

Recent annual sale packets required registration window and a $500 deposit; bidding often starts at 18% penalty rate under Illinois rules. Obtain the current Treasurer PDF for exact deposit, payment, and overbid rules. Sealed-bid deed sales have separate Meyer/ILTaxSaleBids terms.

Title risk

Liens that survive the sale

Certificate/lien stage does not clear title. After tax deed issues under Illinois process, most junior private liens may be cut off; federal liens can survive. Full title search mandatory before deed path.

Quiet title

Tax deed and statutory notice help; quiet title still common for insurable resale title in downstate inventory.

Deal maths for Illinois

Assessment ratio: 0.3333× of market value
Typical quiet title: $1,800–$5,000 · 5 mo
Recording and transfer: $350

35 ILCS 200/9-145: property outside Cook County is assessed at 33⅓% of fair cash value.

Offices and records

Tax collector

Williamson County Treasurer ↗

618-998-2142

Clerk of court

Williamson County Clerk / Recorder resources ↗

Property appraiser

Williamson County Supervisor of Assessments / DEVNET tax inquiry ↗

GIS / parcel map

Williamson County property tax inquiry / mapping resources ↗

Areas trending up

Directional read from dated market analysis — not a guarantee, and not a substitute for your own comps.

Marion / downtown–hospital core

County-seat medical and retail employment with the most liquid SF in the county

Crab Orchard / lake-recreation fringe

Recreation-adjacent residential demand east of Marion

I-57 corridor commercial edge

Interstate retail and logistics jobs supporting workforce housing