The Cook County Assessor’s office mailed 2025 property assessment notices on October 01, 2025. to Thornton Township property owners. The 44-day window to appeal your 2025 assessed value is now open until the deadline of November 14, 2025. The following cities, towns, and villages are in Thornton Township: Blue Island (southern edge), Burnham, Calumet City, Dixmoor, Dolton, East Hazel Crest, Glenwood (northern 1/4), Harvey, Hazel Crest, Homewood (northeast half), Lansing (northern half), Markham (eastern 1/4), Phoenix, Posen, Riverdale, South Holland, and Thornton.

We recommend homeowners review their assessments annually and appeal whenever a strong evidence-based argument is that your property may not be assessed fairly. Thornton Township’s next triennial reassessment is scheduled for 2026. However, if you feel that your assessment is unfair, there is no need to wait; property owners have the right to appeal yearly at the Assessor’s office and the Board of Review. If you’d like a professional opinion on your home’s assessed value as it compares to similar properties in your neighborhood, contact us for a free, no-obligation review and analysis of your home.

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