Thornton Township property tax appeal guide

When were the calendar records checked?

• Cook County Assessor: last retrieved November 9, 2026 at 9:00 AM CST.
• Board of Review: last retrieved October 25, 2026 at 9:00 AM CDT. Dates are unverified; confirm with the official source.

These are separate source retrievals, not editorial reviews or a guarantee that filing is open. A published source date can be older than its retrieval date. Missing dates do not mean there is no deadline.

Cities and villages in Thornton Township

Property addresses in Thornton Township most often list these cities:

• Calumet City — 8,741 single-family parcels (18% of this township's single-family parcels)
• South Holland — 7,617 single-family parcels (16% of this township's single-family parcels)
• Dolton — 7,350 single-family parcels (15% of this township's single-family parcels)
• Lansing — 7,203 single-family parcels (15% of this township's single-family parcels)
• Harvey — 6,598 single-family parcels (14% of this township's single-family parcels)
• Riverdale — 2,793 single-family parcels (6% of this township's single-family parcels)
• Homewood — 1,614 single-family parcels (3% of this township's single-family parcels)
• Markham — 1,355 single-family parcels (3% of this township's single-family parcels)
• Hazel Crest — 1,137 single-family parcels (2% of this township's single-family parcels)
• Burnham — 1,026 single-family parcels (2% of this township's single-family parcels)
• Thornton — 891 single-family parcels (2% of this township's single-family parcels)
• Dixmoor — 841 single-family parcels (2% of this township's single-family parcels)

A city can span more than one township, so confirm your township on your assessment notice or the Cook County Assessor's site.

Recent home sales in Thornton Township

From August 11, 2024 through August 11, 2026, the comparison pool contains 3,012 recorded single-family sales.

• Median sale price: $165,773
• Middle-half sale price range (25th–75th percentile): $115,000–$220,700
• Median sale price per square foot: $140
• Median building size: 1,154 square feet
• Median year built: 1957

These are recorded single-family sales used as comparison evidence, not an estimate of any home's value.

Evidence to review

• For homes built as part of the same subdivision, verify that the construction era, floor plan, building area, and later alterations remain comparable.
• Account for differences in lot size and in detached garages or other outbuildings instead of treating nearby parcels as interchangeable.
• If flooding or chronic drainage has affected the property, assemble dated photographs and records that establish the condition and its timing.
• Draw recent recorded sales from the subject's assessment neighborhood, then retain the properties whose land and building details fit most closely.

To check property facts on the county map, follow our CookViewer property comparison walkthrough. Keep assessment values separate from recorded sale prices.

Official sources

Cook County Assessor calendar · Cook County Board of Review appeals

You file directly with Cook County for free. We provide optional research, not representation or guaranteed savings.

Other South Triad townships

• Oak Park Township
• Berwyn Township
• Cicero Township
• Worth Township
• Proviso Township
• Bremen Township
• Orland Township
• Lyons Township
• Rich Township
• Bloom Township
• Palos Township
• Stickney Township
• Lemont Township
• Riverside Township
• Calumet Township
• River Forest Township

Related guides

• Cook County property tax appeal evidence checklist — Organize records, sales comparisons, photos, and submission confirmations with a printable preparation checklist.
• How much could a Cook County property tax appeal save? — Work through an illustrative tax calculation and understand why an assessment reduction is different from a tax saving.
• Wrong square footage on your Cook County assessment? — Verify property measurements, document a record error, and prepare a correction request with an evidence checklist.
• Why are my neighbor’s property taxes lower in Cook County? — Separate assessments from exemptions, compare similar homes, and work through a neighbor comparison before appealing.
• Cook County property tax appeal after buying a home — Assessment higher than your purchase price? Compare the figures, gather closing documents, and check your appeal window.
• How to use CookViewer to compare Cook County properties — Find the official map, compare property facts, and keep assessment figures separate from recorded sale prices.
• Why did my Cook County property tax bill go up? — Work through annual totals, assessment changes, exemptions, and tax rates before choosing your next step.
• How to read your Cook County assessment notice — Understand the numbers, verify your property facts, and turn your notice into an evidence checklist.
• Missed your Cook County property tax appeal deadline? — Find out which window closed, check the other appeal office, and prepare for what comes next.
• Assessor appeal vs Board of Review appeal — Understand the two appeal offices, their separate calendars, and the evidence each reviews.
• How to find comparable sales — Review a hypothetical sales comparison and print a blank research worksheet.
• How to appeal without a lawyer — Gather evidence, check your township window, and file directly with Cook County.
• Cook County property tax exemptions: are you missing one? — Check which exemptions apply, renew automatically, or need annual filing.
• What happens after a Board of Review appeal? — Understand PTAB's role after a Board of Review decision and its filing instructions.
• How to find your Cook County PIN — Find your 14-digit PIN on county records and use it for filings and research.
• Cook County property tax appeal research guide — See how property records and comparable sales can support an assessment appeal.