Independent service. Not affiliated with Cook County, the Cook County Assessor or the Board of Review. Filing with the county is free.
Oak Park property tax appeal 2026
All of Oak Park's homes in our data are in Oak Park Township, so Oak Park homeowners follow Oak Park Township's 2026 appeal dates. Appeals go to the Cook County Assessor and the Board of Review, not to the city.
Oak Park appeal deadlines 2026 by township
| Township | Assessor | Board of Review |
|---|---|---|
| Oak Park Township100% of Oak Park's parcels | closed Jun 18 | closed Sep 1 |
Dates: Assessor's calendar and Board of Review dates, checked on October 9, 2026.
Oak Park homes at a glance
- 17,025 residential (class 2) parcels, of them 9,647 houses and 5,318 condominium units.
- Main ZIP codes: 60302, 60304, 60301.
Property tax on a typical Oak Park house
Our estimate for the median house in Oak Park: about $14,800 a year (median 2025 assessed value $45,301). An appeal lowers the assessed value, which is one part of that bill; exemptions, the state equalizer and local tax rates are the others.
Our calculation from Cook County open data, not official figures and not your bill: 2025 final assessed value × the 2025 state equalizer × the 2025 tax rate of the home's tax code, minus the homeowner exemption, for 9,631 houses (classes 202–209, 234, 278).
Oak Park homeowners at the Board of Review last year
For tax year 2025, 1,212 Oak Park homeowners filed on their own at the Board of Review for a house, and 722 of them got a lower value.
Private houses, appeals filed without an attorney. Source: Cook County Board of Review open data (Appeal Decision History), our analysis, not official figures. Results for every township.
How to appeal in Oak Park
- Find your township. It is on your assessment notice; the free check below shows it from your address.
- File with the Cook County Assessor while your township's window is open. Filing is free and online; you don't need to hire anyone.
- Board of Review is a second chance. When the Board opens your township, you can file there too, also free.
Step by step: how to appeal · choosing comparables · Assessor or Board of Review.
Questions
Which township is Oak Park in?
Oak Park is in Oak Park Township.
What is the Oak Park property tax appeal deadline in 2026?
It depends on the township. Oak Park Township: Assessor last file date June 18, 2026, Board of Review August 3, 2026 to September 1, 2026.
Do I appeal to the City of Oak Park?
No. Assessment appeals in Cook County go to the Cook County Assessor and then the Board of Review. Filing with either is free.
How much property tax does a typical Oak Park house pay?
Our estimate for the median house is about $14,800 a year, from 2025 assessed values and tax rates in county open data. It is not an official figure; your bill shows your own amount.
About Cook Tax Check
Cook Tax Check is an independent service run by Virix Ltd. We are not the county and not a law firm. Our check of your home against similar homes is free. If it looks worth appealing, our document packet costs $49. Savings Guarantee: no savings? Your next appeal is on us. If the Assessor says no, we prepare your Board of Review appeal for free, and if neither office lowers your value, your appeal package for next tax year is on us (terms). You file yourself, for free, on the county's website — we don't file or represent anyone. See a sample packet.
Nearby
Sources
- Cook County Assessor — assessment calendar and deadlines
- Board of Review — dates and deadlines
- Cook County open data — Parcel Universe
- Cook County open data — Assessed Values
- Cook County Assessor — residential appeals
Dates last checked against the Assessor's calendar and the Board of Review's published dates on October 9, 2026. If anything here differs from the county's own pages, the county's pages win.