Knox County deadline

Knox County 2026 assessment complaint deadline

The 2026 county-wide complaint window is open through October 19, 2026.

County-wide model Knox County used one complaint window for the whole county in 2026; this is not a township-by-township publication calendar.

2026 Board of Review complaint window

Open

Knox County county-wide

Opened: September 17, 2026

Deadline: October 19, 2026

11 days remain. Confirm the filing method on the official Board of Review site.

Official Knox County sources

Knox County's Assessment Office says the 2026 Board of Review appeal time is open from September 17, 2026 until October 19, 2026. The 2026 assessment publication states the filing deadline for the 2026 assessment year is 4 p.m. on Monday, October 19, 2026 for drop-offs or postmarked date, and email appeals by 4:00 pm. File one copy of the 2026 complaint form and all supporting evidence with the Knox County Board of Review, 121 S Prairie Street, Suite 1, Galesburg, IL 61401, by mail (canceled postmark; metered mail needs a post office date stamp), by hand delivery, or by email to info.assessor@knoxcountyil.gov time-stamped by 4:00 pm. Faxed complaints are not accepted. This is one county-wide deadline, not a township-by-township calendar.

Disclaimer: HomeTaxChallenge is not a government agency and is not affiliated with the Knox County Assessment Office or Knox County Board of Review. Always confirm dates and filing instructions on the official county sources above.