Cook County Property Tax
Public records for Cook County in Illinois. For official filings, protests, and assessments, use the Cook County Assessor.
Official Source Information
Cook County Assessor
The official entity for identifying, listing, and appraising all property within Cook County.
- location_on118 N Clark St, Chicago, IL
- call(312) 443-7550
Tax Rate
Key Deadlines
- 1st installment due Mar 3, 2026
- 2nd installment due Aug 1, 2026
Value Protest
Believe your property was over-assessed? File a formal protest before the county deadline.
Understanding Property Tax in Cook County
Property tax is a local tax on real estate — land and the buildings on it — and it is the main way Cook County funds public schools, roads, emergency services, and other county operations. The amount you owe depends on two things: what your property is worth and the combined tax rate set by the local districts that serve it.
In Illinois, the county tax assessor determines each property's assessed value as of January 1st. The average effective property tax rate in Cook County is about 2.19%. Your bill is the taxable value — the assessed value after any exemptions — multiplied by that rate.
Because rates and exemptions are set locally, two similar homes in different parts of Cook County can owe very different amounts. The official county records linked on this page show the figures that actually apply to a given parcel.
Quick Estimate
A home assessed at $250,000 at Cook County's 2.19% average effective rate would owe roughly:
$5,475 / yr
Before exemptions. Your actual rate depends on your local taxing districts.
How to Look Up Cook County Property Tax Records
Open the official lookup
Use the Cook County records link near the top of this page to reach the official county search tool.
Search your property
Search by street address, owner name, or parcel/account number to find the right parcel.
Review the record
Check the assessed value, tax rate, amount due, payment status, and any exemptions on file.
What's in a County Property Tax Record
A Cook County property tax record pulls together the assessment and billing details the county keeps for each parcel. You can typically expect:
Cook County Property Tax FAQ
How are property taxes calculated in Cook County? expand_more
Property tax in Cook County is based on the assessed value your county tax assessor places on the property as of January 1st, multiplied by the combined tax rate of the local districts that serve your parcel. The average effective property tax rate in Cook County is about 2.19%. Exemptions such as a homestead exemption reduce the taxable value before the rate is applied.
When are Cook County property taxes due? expand_more
Key dates for Cook County: 1st installment due (Mar 3, 2026), 2nd installment due (Aug 1, 2026).
How do I look up property tax records in Cook County? expand_more
Use the official Cook County lookup link near the top of this page, then search by property address, owner name, or parcel/account number. The official county portal shows the assessed value, tax rate, amount due, payment status, and any exemptions on record.
How can I lower my Cook County property tax bill? expand_more
Two common routes: claim every exemption you qualify for — homestead, senior, veteran, or disability — and appeal your assessed value if it is higher than your property's market value. Appeals must be filed with the county tax assessor before the local deadline.
Who do I contact about Cook County property taxes? expand_more
Reach the Cook County Assessor at (312) 443-7550, located at 118 N Clark St, Chicago, IL.