235 Mason St, Calumet City, IL 60409

Compare this assessment

Start with the county value and property facts, then review appraisal comps, recent sales, and prior-year changes to decide whether the assessment is worth challenging. The comps on this page are free to review; email sign-in is only used to save a printable report.

For nearby context, browse ZIP 60409 and Thornton assessment pages.

Appeal deadlines

Thornton 2026 appeal dates have not been published yet.

Deadline rule: Set by township: file with the Assessor by your township's last file date, and with the Board of Review while your township is open there. Evidence is reviewed by the Cook County Assessor's Office or, in a separate appeal, by the Cook County Board of Review. Dates checked September 27, 2026 against the official source.

Assessment snapshot

These public CCAO records highlight what may be worth checking before you file.

• Assessment changeThe assessor market value stayed about the same, from $91,290 in 2024 to $91,290 in 2025.
• Assessor market value per square footThe current public record shows about $92 per square foot before any comparable-property adjustments.
• Nearby comparison areaThis page starts the equity review with public records for the Thornton neighborhood and ZIP 60409.
• Neighborhood value signalAmong 3,371 residential records in the same neighborhood, the average assessor market value is about $87 per square foot.
• Area year-over-year signalNearby residential records with prior-year values stayed about flat on average.

Public appraisal comparison for 2025. Prepared October 15, 2026. Appraisal source: Cook County Assessor's Office. Sales data checked in this snapshot: October 13, 2026. Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Down 8.7% in 2025 from 2024.