Cook County · Illinois
Thornton Township property tax appeals
A Thornton Township property tax appeal starts with the Cook County Assessor's Office, then the Cook County Board of Review. This season's deadline has not been announced yet. Our forecast for Thornton Township, Cook County Assessor's Office: Nov 18, 2026 – Dec 23, 2026 (not an official date).
- Next deadline
- Expected Nov 18, 2026 – Dec 23, 2026
- Forecast, not an official date
- Thornton Township · Cook County Assessor's Office
- Source: Assessment & Appeal Calendar (page last updated 9/22/26) - Cook County Assessor's OfficeLast checked
Check a Thornton Township home for free
Enter the address or parcel number from your notice. We compare the assessment with similar homes and show the numbers, whatever they are. You decide and file yourself.
Part of Cook CountyEvery appeal date in Cook County
- Where to file first
- Cook County Assessor's Office
- Our coverage
- Free check available
- Independent guide — not affiliated with Thornton, Cook County or any government agency.
When and where do I file a Thornton Township property tax appeal?
Who hears a Thornton Township appeal?
The stages in order. We are not affiliated with any of these offices.
Cook County Assessor's Office
Cook County Board of Review
Circuit Court of Cook County (tax objection)
Illinois Property Tax Appeal Board
Which Thornton Township filing windows are coming up?
| Closes | Area | Who hears it | Status |
|---|---|---|---|
| Expected Nov 18, 2026 – Dec 23, 2026 | Thornton Township | Cook County Assessor's Office | Forecast, not an official date |
When were past Thornton Township deadlines?
| Tax year | Window | Office |
|---|---|---|
| 2025 | Closed November 14, 2025 | Thornton · Cook County Assessor's Office |
| 2023 | Closed September 5, 2023 | Thornton · Cook County Assessor's Office |
When is the Thornton appeal deadline?
Cook County Assessor's Office: Expected to close between November 18, 2026 and December 23, 2026 (predicted, not yet announced).
- Deadline detailBoard of Review re-review
- Thornton Township, tax year 2025: the Board of Review's decision date was May 11, 2026 and the re-review period closed May 13, 2026; the Assessor (CCAO) certification date was Jun 1, 2026.[1]
Who can answer questions about my assessment?
Hours: Thornton Township Assessor's office hours: 9:00 A.M. to 4:00 P.M. Office: The Thornton Township Assessor's office is at 333 E. 162nd St., South Holland, IL 60473; phone (708) 596-6040 ext. 3175.
What do Thornton Township property taxes and assessments look like?
Figures from public records and the Census, each with its source. They describe the county's homes as a group, not the value of any one home.
How Thornton Township home assessments are spread
Thornton Township compared with other townships
- Worth$23,000
- Cicero$22,000
- Rich$20,000
- Lake$19,861
- Bremen$19,353
- Bloom$14,168
- Hyde Park$13,701
- Calumet$13,000
- Thornton$12,000
Ranked 38 of 38; showing the 9 nearest in rank.
Median assessed value by township: highest North Chicago ($135,400), lowest Thornton ($12,000).
What happened to Thornton Township appeals in tax year 2025
- Assessor12% lowered of 3,884
- Board of Review44% lowered of 7,125
Assessor: 12% of 3,884 appeals lowered (median cut 7.2%); Board of Review: 44% of 7,125 appeals lowered (median cut 10.6%)
How often is property reassessed in Thornton?
Thornton Township is reassessed every three years with the South and West Suburbs; its scheduled reassessment years are 2026, 2029 and 2032.
- Reassessment cycle
- Thornton Township is reassessed every three years with the South and West Suburbs; its scheduled reassessment years are 2026, 2029 and 2032.[2]
What do home values and property taxes look like in Thornton?
Thornton Township (2023 reassessment): the Assessor's median estimated market value for single-family homes was $124,000 (median 2022 sale price $152,000) (tax year 2023). Thornton Township (2023 reassessment): condos had a median 2022 sale price of $77,000; the Assessor's median estimate was $73,000 (tax year 2023).
- Median assessor estimate
- Thornton Township (2023 reassessment): the Assessor's median estimated market value for single-family homes was $124,000 (median 2022 sale price $152,000).[3]
- Median condo price
- Thornton Township (2023 reassessment): condos had a median 2022 sale price of $77,000; the Assessor's median estimate was $73,000.[3]
- Median sale price
- Thornton Township (2023 reassessment): the median sale price of single-family homes in 2022 was $152,000; the Assessor's median market value estimate for the class was $124,000.[3]
- Median small apartment price
- Thornton Township (2023 reassessment): small apartment buildings had a median 2022 sale price of $199,000; the Assessor's median estimate was $164,000.[3]
Other places nearby
- Stickney TownshipFree check available
- Worth TownshipFree check available
- Riverside TownshipFree check available
- River Forest TownshipFree check available
- Rich TownshipFree check available
- Proviso TownshipFree check available
Where do these facts come from?
- [1]Board of Review 2025 Re-Review/Decision Dates (PDF, Rev.6/9/2026) - Cook County Board of ReviewOfficial notice, form, calendar or rules · last checked Oct 1, 2026
- [2]Township Triennial Reassessment Schedule (PDF) - Cook County Board of ReviewOfficial notice, form, calendar or rules · last checked Oct 1, 2026
- [3]Property Values for Thornton Township Released - Cook County Assessor's Office (press release, August 15, 2023)Official guide or FAQ · last checked Oct 1, 2026
- [4]Cook County Township Assessors - Cook County Assessor's OfficeOfficial guide or FAQ · last checked Oct 1, 2026
- [5]Assessment & Appeal Calendar (page last updated 9/22/26) - Cook County Assessor's OfficeOfficial notice, form, calendar or rules · last checked Sep 24, 2026
- [6]35 ILCS 200/12-55 - Illinois Property Tax Code (ILGA; Wayback capture 2026-01-09)Statute or regulation · last checked Sep 24, 2026
- [7]2025 Assessment Calendar (PDF) - Cook County Assessor's Office (Wayback Machine capture 2026-05-11)Official notice, form, calendar or rules · last checked Sep 24, 2026
- 8.County open data: cook assessmentsRetrieved Sep 25, 2026; aggregated by us for the charts above.
- 9.County open data: cook parcelsRetrieved Sep 25, 2026; aggregated by us for the charts above.
- 10.County open data: cook parcelsRetrieved Sep 25, 2026; aggregated by us for the charts above.
- 11.County open data: cook parcelsRetrieved Sep 25, 2026; aggregated by us for the charts above.
- 12.County open data: appeal resultsAggregated by us for the appeal-results chart.
- 13.County open data: appeal resultsAggregated by us for the appeal-results chart.
Not affiliated with Thornton Township or any government agency. Not legal advice. Not an appraisal.