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Cook County · Illinois

Leyden Township property tax appeals

A Leyden Township property tax appeal starts with the Cook County Assessor's Office, then the Cook County Board of Review. The next deadline is Oct 14, 2026 for Leyden Township, Cook County Assessor's Office.

Next deadline
Oct 14, 2026
11 days left
Leyden Township · Cook County Assessor's Office

Opens Aug 31, 2026Closes Oct 14, 2026

Source: Assessment & Appeal Calendar (page last updated 9/22/26) - Cook County Assessor's OfficeLast checked

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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 Leyden, 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 Leyden Township property tax appeal?

Who hears a Leyden 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 Leyden Township filing windows are coming up?

Leyden Township filing windows
ClosesAreaWho hears itStatus
Oct 14, 2026Leyden TownshipCook County Assessor's Office · Official source · Last checked Sep 29, 202611 days left

When were past Leyden Township deadlines?

Past Leyden Township filing windows
Tax yearWindowOffice
2025Closed September 2, 2025Leyden · Cook County Assessor's Office
2022Closed October 17, 2022Leyden · Cook County Assessor's Office

When is the Leyden appeal deadline?

Cook County Assessor's Office: Closes October 14, 2026.

Deadline detailBoard of Review re-review
Leyden 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
Leyden Township (2025 reassessment): Reassessment Notices were mailed Jul 21, 2025; appeals were due Sep 2, 2025.[2] (latest published: tax year 2025)

Who can answer questions about my assessment?

Hours: Leyden Township Assessor's office hours: 8:00 A.M. to 5:00 P.M. Office: The Leyden Township Assessor's office is at 2501 N. Mannheim Rd. Franklin Pk., IL 60131; phone (847) 455-8616.

ContactHours
Leyden Township Assessor's office hours: 8:00 A.M. to 5:00 P.M.[6]
ContactOffice
The Leyden Township Assessor's office is at 2501 N. Mannheim Rd. Franklin Pk., IL 60131; phone (847) 455-8616.[6]

Upcoming appeal deadlines in every county we track

What do Leyden 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 Leyden Township home assessments are spread

Assessed values of 22,991 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 $26,000 and $36,000; the median is $30,000. 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.

Leyden Township compared with other townships

  1. Riverside$35,000
  2. Lyons$33,000
  3. Palos$32,595
  4. Hanover$31,000
  5. Leyden$30,000
  6. West Chicago$30,000
  7. Berwyn$25,000
  8. Proviso$24,000
  9. Stickney$23,000

Ranked 25 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 Leyden Township appeals in tax year 2025

  1. Assessor19% lowered of 6,439
  2. Board of Review60% lowered of 6,282

Assessor: 19% of 6,439 appeals lowered (median cut 5.5%); Board of Review: 60% of 6,282 appeals lowered (median cut 6.7%)

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.

Leyden Township filing windows on a calendar

  1. Leyden TownshipOct 14, 2026 · Cook County Assessor's Office · Open now

The dashed line marks today.

Leyden Township: Oct 14, 2026

Each bar is a filing window from its opening day to its last day. Forecasts show the expected closing range and are not official dates.Source: the official calendars and rules cited in the sources list below.

How often is property reassessed in Leyden?

Leyden Township is reassessed every three years with the North Suburbs; its scheduled reassessment years are 2025, 2028 and 2031.

Reassessment cycle
Leyden Township is reassessed every three years with the North Suburbs; its scheduled reassessment years are 2025, 2028 and 2031.[3]

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

Leyden Township (2022 reassessment): total assessed value grew 62% at the Assessor's initial reassessment, before appeals (tax year 2022). Leyden Township (2025 reassessment): the Assessor's median estimated market value for single-family homes was $301,000 (median 2024 sale price $334,000) (tax year 2025).

Assessed value change
Leyden Township (2022 reassessment): total assessed value grew 62% at the Assessor's initial reassessment, before appeals.[4] (latest published: tax year 2022)
Median assessor estimate
Leyden Township (2025 reassessment): the Assessor's median estimated market value for single-family homes was $301,000 (median 2024 sale price $334,000).[2] (latest published: tax year 2025)
Median condo price
Leyden Township (2025 reassessment): condos had a median 2024 sale price of $158,000; the Assessor's median estimate was $154,000.[2] (latest published: tax year 2025)
Median sale price
Leyden Township (2025 reassessment): the median sale price of single-family homes in 2024 was $334,000; the Assessor's median market value estimate for the class was $301,000.[5] (latest published: tax year 2025)
Median small apartment price
Leyden Township (2025 reassessment): small apartment buildings had a median 2024 sale price of $570,000; the Assessor's median estimate was $527,000.[2] (latest published: tax year 2025)

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]Leyden Township: 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]Leyden Township Property Values Released - Cook County Assessor's Office (press release, September 19, 2022)Official guide or FAQ · last checked Oct 1, 2026
  5. [5]Property Values for Leyden Township Released - Cook County Assessor's Office (press release, July 24, 2025)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.County open data: cook assessmentsRetrieved Sep 25, 2026; aggregated by us for the charts above.
  10. 10.County open data: cook parcelsRetrieved 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: appeal resultsAggregated by us for the appeal-results chart.
  14. 14.County open data: appeal resultsAggregated by us for the appeal-results chart.

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

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