Free for Cook County homeowners
Are You Overpaying on Cook County Property Taxes?
Compare your CCAO value with similar homes nearby and get the evidence to appeal it.
Find your account number at www.cookcountyassessor.com/address-search
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- Public Cook County Assessor's Office records
3 bed · 2,150 sqft · built 1998
about $23,000
8 similar homes nearby are assessed about $23,000 lower than this one.
How sure: Medium · 8 similar homes · public records only
Results vary. Many homes are assessed in line with similar homes.
Cook County appeal calendar
- 2026Deadlines are set by township
- March 20272027 notices usually start
Dates checked September 27, 2026 · Official deadline rule (opens in new tab)
Know your deadline
Set by township: file with the Assessor by your township's last file date, and with the Board of Review while your township is open there.
Read the appeal guideCook County appeal dates by township
2026 filing windows for each township, with the Assessor first and then the Board of Review. Check your notice for your own dates.
| Township | Assessor | Board of Review |
|---|---|---|
| Norwood Park | Apr 13 – May 26 | Aug 3 – Sep 1 |
| Rogers Park | Apr 17 – Jun 1 | Aug 3 – Sep 1 |
| River Forest | Apr 20 – Jun 2 | Aug 3 – Sep 1 |
| Evanston | Apr 22 – Jun 4 | Aug 3 – Sep 1 |
| Riverside | Apr 24 – Jun 8 | Aug 3 – Sep 1 |
| Oak Park | May 6 – Jun 18 | Aug 3 – Sep 1 |
| New Trier | May 7 – Jun 22 | Aug 3 – Sep 1 |
| Berwyn | May 20 – Jul 6 | Aug 31 – Sep 29 |
| Lake View | May 28 – Jul 13 | Aug 31 – Sep 29 |
| Palos | Jun 3 – Jul 17 | Aug 31 – Sep 29 |
| Maine | Jun 5 – Jul 21 | Aug 31 – Sep 29 |
| Cicero | Jun 17 – Jul 31 | Aug 31 – Sep 29 |
| Elk Grove | Jun 22 – Aug 4 | Aug 31 – Sep 29 |
| Stickney | Jun 29 – Aug 12 | Not published yet |
| West Chicago | Jul 10 – Aug 21 | Not published yet |
| Lyons | Jul 23 – Sep 3 | Not published yet |
| Northfield | Jul 24 – Sep 4 | Not published yet |
| Barrington | Aug 11 – Sep 23 | Not published yet |
| Bremen | Aug 12 – Sep 24 | Not published yet |
| Lemont | Aug 17 – Sep 29 | Not published yet |
| Calumet | Aug 20 – Oct 2 | Not published yet |
| Hyde Park | Aug 26 – Oct 8 | Not published yet |
| Leyden | Aug 31 – Oct 14 | Not published yet |
| Worth | Sep 1 – Oct 15 | Not published yet |
| Wheeling | Sep 9 – Oct 22 | Not published yet |
| Proviso | Sep 14 – Oct 27 | Not published yet |
| Lake | Sep 16 – Oct 29 | Not published yet |
| Palatine | Sep 22 – Nov 4 | Not published yet |
| Orland | Sep 24 – Nov 6 | Not published yet |
| Bloom | Not published yet | Not published yet |
| Hanover | Not published yet | Not published yet |
| Jefferson | Not published yet | Not published yet |
| Niles | Not published yet | Not published yet |
| North Chicago | Not published yet | Not published yet |
| Rich | Not published yet | Not published yet |
| Schaumburg | Not published yet | Not published yet |
| South Chicago | Not published yet | Not published yet |
| Thornton | Not published yet | Not published yet |
Township names link to their appeal guides. Dates checked September 27, 2026 · Official calendar (opens in new tab)
How it works
Look up your home
Enter your address or CCAO account number. We pull your record and value history from Cook County Assessor's Office public data.
See how your value compares
We find similar homes nearby and show whether yours is valued higher per square foot.
Appeal your way
Save a free evidence packet for your online appeal, or have a pro file for you.
Browse Cook County assessments
See how values changed in your neighborhood or ZIP code.
Cook County appeal guides
Check the local filing process, prepare your evidence, and verify the deadline on your notice before submitting an appeal.
How to Appeal Your Cook County Property Tax Assessment
Complete guide to filing a property tax appeal with the Cook County Assessor and Board of Review. Learn township deadlines, evidence strategies, and online filing.
Cook County Board of Review Hearing: What to Expect
Prepare for your Board of Review hearing. Learn hearing procedures, what evidence to bring, and how to present your case.
Using Comparable Properties to Appeal Your Cook County Assessment
Learn how to use comparable properties to build a strong property tax appeal case. Understand equity analysis, $/sqft comparisons, and what the Board of Review looks for.
Frequently asked questions
Plain answers about cost, deadlines and evidence before you appeal.
What is a property tax appeal?
A property tax appeal is your legal right to challenge the appraised value the county places on your home. In Cook County, you file an appeal with the Cook County Assessor's Office and present evidence that your home is over-assessed compared to similar properties.
How much does Cook County Value cost?
Looking up your property, viewing assessment history, and reviewing appraisal and sales comps is free — no login required. Printable reports may require an email sign-in so you can return to them later.
When is the deadline to appeal?
In Cook County, your deadline is set by your township (check its Assessor and Board of Review dates). You can file online via CCAO's website.
What are comparable properties?
Comparable properties (comps) are nearby homes with similar characteristics — square footage, age, bedrooms, bathrooms, and quality grade. If similar homes are assessed at lower values per square foot, that's evidence your property may be over-assessed.
Do I need a lawyer or tax agent?
No. Many homeowners successfully appeal on their own using evidence like what Cook County Value provides. Review the official filing instructions and choose representation if you need help with your circumstances.