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Cook County · Illinois

Oak Park Township property tax appeals

An Oak Park 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 Oak Park Township, Cook County Assessor's Office: Apr 7, 2027 – Jun 18, 2027 (not an official date).

Next deadline
Expected Apr 7, 2027 – Jun 18, 2027
Forecast, not an official date
Oak Park Township · Cook County Assessor's Office
Source: 35 ILCS 200/12-55 - Illinois Property Tax Code (ILGA; Wayback capture 2026-01-09)Last checked

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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 Oak Park, 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 an Oak Park Township property tax appeal?

Who hears an Oak Park 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 Oak Park Township filing windows are coming up?

Oak Park Township filing windows
ClosesAreaWho hears itStatus
Expected Apr 7, 2027 – Jun 18, 2027Oak Park TownshipCook County Assessor's Office · Official source · Last checked Oct 3, 2026Forecast, not an official date
Expected Aug 11, 2027 – Sep 22, 2027Oak Park TownshipCook County Board of Review · Official source · Last checked Oct 3, 2026Forecast, not an official date

When were past Oak Park Township deadlines?

Past Oak Park Township filing windows
Tax yearWindowOffice
2026Closed September 1, 2026Oak Park · Cook County Board of Review
2026Closed June 18, 2026Oak Park · Cook County Assessor's Office
2023Closed May 15, 2023Oak Park · Cook County Assessor's Office
2020Closed April 7, 2020Oak Park · Cook County Assessor's Office

When is the Oak Park appeal deadline?

Cook County Assessor's Office: Expected around May 2027 (between April 7, 2027 and June 18, 2027), based on past deadlines for tax years 2020, 2023 and 2026 (predicted, not yet announced). Cook County Board of Review: Expected to close between August 11, 2027 and September 22, 2027 (predicted, not yet announced). We'll confirm these dates when the county posts them.

Deadline detailBoard of Review re-review
Oak Park Township, tax year 2025: the Board of Review's decision date was Feb 9, 2026 and the re-review period closed Feb 11, 2026; the Assessor (CCAO) certification date was Apr 20, 2026.[1] (latest published: tax year 2025)
Deadline detailNotice mailed
Oak Park Township (2026 reassessment): Reassessment Notices were mailed May 6, 2026; appeals were due Jun 18, 2026.[2]

Who can answer questions about my assessment?

Hours: Oak Park Township Assessor's office hours: 9:00 A.M. to 5:00 P.M. Office: The Oak Park Township Assessor's office is at 105 S. Oak Park Ave. Oak Park, IL 60302; phone (708) 383-8005.

ContactHours
Oak Park Township Assessor's office hours: 9:00 A.M. to 5:00 P.M.[6]
ContactOffice
The Oak Park Township Assessor's office is at 105 S. Oak Park Ave. Oak Park, IL 60302; phone (708) 383-8005.[6]

Upcoming appeal deadlines in every county we track

What do Oak Park 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 Oak Park Township home assessments are spread

Assessed values of 11,205 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 $37,000 and $57,504; the median is $45,000. 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.

Oak Park Township compared with other townships

  1. River Forest$69,000
  2. Evanston$61,000
  3. Lemont$47,001
  4. Rogers Park$46,001
  5. Oak Park$45,000
  6. Palatine$42,553
  7. Wheeling$42,001
  8. Elk Grove$40,000
  9. Maine$40,000

Ranked 10 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.

How much home assessments changed, by township

  1. River Forest+27.8%
  2. Berwyn+24.0%
  3. Oak Park+22.2%
  4. Stickney+21.1%
  5. Riverside+20.4%
  6. Cicero+20.0%
  7. Palos+20.0%
  8. Elk Grove0.0%
  9. Evanston0.0%

Ranked 3 of 14; showing the 9 nearest in rank.

Median change in assessed value from tax year 2025 values after the Board of Review to tax year 2026 Assessor-certified values: Berwyn +24.0%, Cicero +20.0%, Elk Grove 0.0%, Evanston 0.0%, Maine 0.0%, New Trier 0.0% and more.

Median change per home from tax year 2025 values after the Board of Review to tax year 2026 Assessor-certified values, for homes with a value at both stages. 14 townships have the newer values so far.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 Oak Park Township appeals in tax year 2025

  1. Assessor16% lowered of 2,310
  2. Board of Review45% lowered of 3,446

Assessor: 16% of 2,310 appeals lowered (median cut 5.5%); Board of Review: 45% of 3,446 appeals lowered (median cut 6.2%)

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.

Oak Park Township filing windows on a calendar

  1. Oak Park TownshipExpected Apr 7, 2027 – Jun 18, 2027 · Cook County Assessor's Office · Forecast, not an official date
  2. Oak Park TownshipExpected Aug 11, 2027 – Sep 22, 2027 · Cook County Board of Review · Forecast, not an official date

Oak Park Township: Expected Apr 7, 2027 – Jun 18, 2027; Oak Park Township: Expected Aug 11, 2027 – Sep 22, 2027

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 Oak Park?

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

Reassessment cycle
Oak Park 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 Oak Park?

Oak Park Township (2020 reassessment): total assessed value grew 29% at the Assessor's initial reassessment, before appeals (tax year 2020). Oak Park Township (2026 reassessment): the Assessor's median estimated market value for single-family homes was $559,000 (median 2025 sale price $596,000).

Assessed value change
Oak Park Township (2020 reassessment): total assessed value grew 29% at the Assessor's initial reassessment, before appeals.[4] (latest published: tax year 2020)
Median assessor estimate
Oak Park Township (2026 reassessment): the Assessor's median estimated market value for single-family homes was $559,000 (median 2025 sale price $596,000).[2]
Median condo price
Oak Park Township (2026 reassessment): condos had a median 2025 sale price of $200,000; the Assessor's median estimate was $204,000.[2]
Median sale price
Oak Park Township (2026 reassessment): the median sale price of single-family homes in 2025 was $596,000; the Assessor's median market value estimate for the class was $559,000.[5]
Median small apartment price
Oak Park Township (2026 reassessment): small apartment buildings had a median 2025 sale price of $615,000; the Assessor's median estimate was $594,000.[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]Oak Park: 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]Detailed Methodology Reports Released for Oak Park Township - Cook County Assessor's Office (press release, March 4, 2020)Official guide or FAQ · last checked Oct 1, 2026
  5. [5]Property Values for Oak Park Township Released - Cook County Assessor's Office (press release, May 20, 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]Cook County Board of Review Dates and Deadlines 2026 Session (PDF, created 2026-09-14)Official notice, form, calendar or rules · last checked Sep 24, 2026
  10. [10]Frequently Asked Questions - Cook County Board of ReviewOfficial guide or FAQ · last checked Sep 24, 2026
  11. [11]Property Values for Oak Park Township Released - Cook County Assessor's Office (press release, April 19, 2023)Official guide or FAQ · last checked Oct 1, 2026
  12. 12.County open data: cook assessmentsRetrieved 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: cook parcelsRetrieved Sep 25, 2026; aggregated by us for the charts above.
  15. 15.County open data: cook parcelsRetrieved Sep 25, 2026; aggregated by us for the charts above.
  16. 16.County open data: appeal resultsAggregated by us for the appeal-results chart.
  17. 17.County open data: appeal resultsAggregated by us for the appeal-results chart.

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

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