St. Clair County deadline tracker

St. Clair County 2026 assessment appeal deadlines

In St. Clair County, you don't get one countywide deadline. Each township publishes its assessment list in a local newspaper, then you generally have about 30 days to file with the Board of Review. City limits are not township lines — check your parcel.

How to use this tracker Find your township → note its status → if open, run a free estimate; if TBD, get an alert; if closed, review next-step options.

Open — You can still file for 2026. TBD — The assessment list is not published yet. Closed — The 2026 Board of Review window ended.

Verified against St. Clair County sources: October 7, 2026. Statuses use America/Chicago time.

Open for 2026 filing

1 township

Open

Canteen Township

Deadline: November 9, 2026

32 days left. Published October 8, 2026 in the East St Louis Monitor.

Check my property

Publication date still TBD

1 township

TBD

O'Fallon Township

Not published yet. The 2026 filing deadline has not been posted.

You can prepare now, but confirm the official publication before treating the window as open.

2026 filing window closed

20 townships

Closed

Belleville Township

2026 window closed: September 29, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Caseyville Township

2026 window closed: September 28, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Centreville Township

2026 window closed: September 28, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

East St. Louis Township

2026 window closed: September 28, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Engelmann Township

2026 window closed: September 28, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Fayetteville Township

2026 window closed: September 28, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Freeburg Township

2026 window closed: September 28, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Lebanon Township

2026 window closed: September 25, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Lenzburg Township

2026 window closed: September 29, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Marissa Township

2026 window closed: September 29, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Mascoutah Township

2026 window closed: September 28, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Millstadt Township

2026 window closed: September 29, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

New Athens Township

2026 window closed: September 28, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Prairie Du Long Township

2026 window closed: September 28, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Shiloh Valley Township

2026 window closed: September 25, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Smithton Township

2026 window closed: September 28, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

St. Clair Township

2026 window closed: September 29, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Stites Township

2026 window closed: September 28, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Stookey Township

2026 window closed: September 29, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Closed

Sugarloaf Township

2026 window closed: September 29, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Deadline alerts

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Choose one or more townships. We'll store your email and selections so a publication alert can be sent when the county posts the dates.

Official St. Clair County sources

St. Clair County's 2026 Publications Listing posts township publication dates and last dates to appeal. Most townships closed late September 2026. Canteen publishes October 8, 2026 with a last appeal date of November 9, 2026. O'Fallon Township has no publication or appeal dates posted yet; the Assessor site says O'Fallon Township values are not yet finalized for 2026. The 2026 non-farm PTAX-230 complaint form must be returned to the Supervisor of Assessments office before the close of business 30 days after publication for the assessment district. Current county materials list paper filing with the office; no e-file portal is listed for the formal complaint. Board of Review materials require evidence in the office at least 5 days before a scheduled hearing.

Disclaimer: HomeTaxChallenge is not a government agency and is not affiliated with the St. Clair County Assessment Office or St. Clair County Board of Review. Always confirm dates on the official county sources above. This is not legal, tax, or appraisal advice.