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Cook County · Illinois

Lemont Township property tax appeals

A Lemont 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 Lemont Township, Cook County Assessor's Office: Jun 9, 2027 – Sep 29, 2027 (not an official date).

Next deadline
Expected Jun 9, 2027 – Sep 29, 2027
Forecast, not an official date
Lemont Township · Cook County Assessor's Office
Source: 35 ILCS 200/12-55 - Illinois Property Tax Code (ILGA; Wayback capture 2026-01-09)Last checked

Check a Lemont 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 Lemont, Cook County or any government agency.
Last updated
October 1, 2026
Sources last checked
October 3, 2026
Status
Verified guide

How we verify facts

When and where do I file a Lemont Township property tax appeal?

Who hears a Lemont Township appeal?

The stages in order. We are not affiliated with any of these offices.

  1. Cook County Assessor's Office

    Filing: appeal

    Official site

  2. Cook County Board of Review

    Filing: complaint

    Official site

  3. Circuit Court of Cook County (tax objection)

    Filing: objection

  4. Illinois Property Tax Appeal Board

    Filing: appeal

    Official site

Which Lemont Township filing windows are coming up?

Lemont Township filing windows
ClosesAreaWho hears itStatus
Expected Jun 9, 2027 – Sep 29, 2027Lemont TownshipCook County Assessor's Office · Official source · Last checked Oct 3, 2026Forecast, not an official date

When were past Lemont Township deadlines?

Past Lemont Township filing windows
Tax yearWindowOffice
2026Closed September 29, 2026Lemont · Cook County Assessor's Office
2023Closed June 9, 2023Lemont · Cook County Assessor's Office
2020Closed July 2, 2020Lemont · Cook County Assessor's Office

When is the Lemont appeal deadline?

Cook County Assessor's Office: Expected around July 2027 (between June 9, 2027 and September 29, 2027), based on past deadlines for tax years 2020, 2023 and 2026 (predicted, not yet announced). We'll confirm it when the county posts it.

Deadline detailBoard of Review re-review
Lemont Township, tax year 2025: the Board of Review's decision date was Mar 17, 2026 and the re-review period closed Mar 19, 2026; the Assessor (CCAO) certification date was May 4, 2026.[1] (latest published: tax year 2025)
Deadline detailNotice mailed
Lemont Township (2026 reassessment): Reassessment Notices were mailed Aug 17, 2026; appeals were due Sep 29, 2026.[2]

Who can answer questions about my assessment?

Hours: Lemont Township Assessor's office hours: 9:00 A.M. to 4:00 P.M. Office: The Lemont Township Assessor's office is at 16300 Alba St. Lemont, IL 60439; phone (630) 257-2522 x 121.

ContactHours
Lemont Township Assessor's office hours: 9:00 A.M. to 4:00 P.M.[6]
ContactOffice
The Lemont Township Assessor's office is at 16300 Alba St. Lemont, IL 60439; phone (630) 257-2522 x 121.[6]

Upcoming appeal deadlines in every county we track

What do Lemont 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 Lemont Township home assessments are spread

Assessed values of 8,036 homes in the property classes our free check covers (202, 203, 204, 205, 206 and 8 more), tax year 2025 values after the Board of Review. Half are between $36,000 and $59,000; the median is $47,001. The last bar holds everything above it.Source: Assessment records from the county's open data (tax year 2025 values after the Board of Review), retrieved Sep 25, 2026; our calculation.

Lemont Township compared with other townships

  1. Barrington$77,000
  2. Northfield$75,929
  3. River Forest$69,000
  4. Evanston$61,000
  5. Lemont$47,001
  6. Rogers Park$46,001
  7. Oak Park$45,000
  8. Palatine$42,553
  9. Wheeling$42,001

Ranked 8 of 38; showing the 9 nearest in rank.

Median assessed value by township: highest North Chicago ($135,400), lowest Thornton ($12,000).

Median assessed value of homes in the property classes our free check covers (202, 203, 204, 205, 206 and 8 more) for each township with at least 50 such homes, tax year 2025 values after the Board of Review.Source: Assessment records from the county's open data (tax year 2025 values after the Board of Review), retrieved Sep 25, 2026; our calculation.

What happened to Lemont Township appeals in tax year 2025

  1. Assessor16% lowered of 1,392
  2. Board of Review31% lowered of 1,984

Assessor: 16% of 1,392 appeals lowered (median cut 5.7%); Board of Review: 31% of 1,984 appeals lowered (median cut 6.0%)

Share of appeals on homes in the property classes our free check covers (202, 203, 204, 205, 206 and 8 more) that were lowered, unchanged or raised, by stage.Source: public appeal results for tax year 2025 from the county's open data, retrieved Sep 25, 2026; our calculation. Past results, not a prediction for any home.

How often is property reassessed in Lemont?

Lemont Township is reassessed every three years with the South and West Suburbs; its scheduled reassessment years are 2026, 2029 and 2032.

Reassessment cycle
Lemont Township is reassessed every three years with the South and West Suburbs; its scheduled reassessment years are 2026, 2029 and 2032.[3]

What do home values and property taxes look like in Lemont?

Lemont Township (2020 reassessment): total assessed value grew 8.8% at the Assessor's initial reassessment, before appeals (tax year 2020). Lemont Township (2026 reassessment): the Assessor's median estimated market value for single-family homes was $595,000 (median 2025 sale price $598,000).

Assessed value change
Lemont Township (2020 reassessment): total assessed value grew 8.8% at the Assessor's initial reassessment, before appeals.[4] (latest published: tax year 2020)
Median assessor estimate
Lemont Township (2026 reassessment): the Assessor's median estimated market value for single-family homes was $595,000 (median 2025 sale price $598,000).[2]
Median condo price
Lemont Township (2026 reassessment): condos had a median 2025 sale price of $295,000; the Assessor's median estimate was $248,000.[2]
Median sale price
Lemont Township (2026 reassessment): the median sale price of single-family homes in 2025 was $598,000; the Assessor's median market value estimate for the class was $595,000.[5]
Median small apartment price
Lemont Township (2026 reassessment): small apartment buildings had a median 2025 sale price of $406,000; the Assessor's median estimate was $438,000.[2]

Other places nearby

Illinois property tax appeals: all counties

Where do these facts come from?

  1. [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. [2]Lemont: Residential Valuations - Cook County Assessor's OfficeOfficial guide or FAQ · last checked Oct 1, 2026
  3. [3]Township Triennial Reassessment Schedule (PDF) - Cook County Board of ReviewOfficial notice, form, calendar or rules · last checked Oct 1, 2026
  4. [4]Lemont Township Properties Reassessed - Cook County Assessor's Office (press release, June 12, 2020)Official guide or FAQ · last checked Oct 1, 2026
  5. [5]Property Values for Lemont Township Released - Cook County Assessor's Office (press release, August 19, 2026)Official guide or FAQ · last checked Oct 1, 2026
  6. [6]Cook County Township Assessors - Cook County Assessor's OfficeOfficial guide or FAQ · last checked Oct 1, 2026
  7. [7]Assessment & Appeal Calendar (page last updated 9/22/26) - Cook County Assessor's OfficeOfficial notice, form, calendar or rules · last checked Sep 24, 2026
  8. [8]35 ILCS 200/12-55 - Illinois Property Tax Code (ILGA; Wayback capture 2026-01-09)Statute or regulation · last checked Sep 24, 2026
  9. [9]Property Values for Lemont Township Released - Cook County Assessor's Office (press release, May 19, 2023)Official guide or FAQ · last checked Oct 1, 2026
  10. 10.County open data: cook assessmentsRetrieved Sep 25, 2026; aggregated by us for the charts above.
  11. 11.County open data: cook parcelsRetrieved Sep 25, 2026; aggregated by us for the charts above.
  12. 12.County open data: cook parcelsRetrieved Sep 25, 2026; aggregated by us for the charts above.
  13. 13.County open data: cook parcelsRetrieved Sep 25, 2026; aggregated by us for the charts above.
  14. 14.County open data: appeal resultsAggregated by us for the appeal-results chart.
  15. 15.County open data: appeal resultsAggregated by us for the appeal-results chart.

Not affiliated with Lemont Township or any government agency. Not legal advice. Not an appraisal.

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