Triennial reassessment notices were mailed on May 6, 2026, to property owners in Oak Park Township, Cook County. If you received a notice, you now have a limited opportunity to review and appeal your property assessment.

Appeal deadline: June 18, 2026

What Is the 2026 Triennial Reassessment?

Cook County has 38 townships, divided into three reassessment districts, with each area reassessed once every three years.

• Oak Park Township is part of the South Suburban triennial group
• This means 2026 is a key reassessment year for local homeowners

During this cycle, property values are updated to reflect current market conditions — which can significantly impact your future tax bills.

Why You Should Review Your Property Assessment
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