Illinois Property Tax Assessors

Cook County, Illinois Tax Assessors' Office

Cook County Assessors Phone Number
Cook County Office of the Assessor
118 North Clark Street, 3rd Floor
Chicago, Illinois 60602

Where is the Cook County Tax Assessor's Office?

The Cook County Tax Assessor Office is located at 118 North Clark Street, 3rd Floor in Chicago, Illinois.

While many counties have county-wide tax assessors, Cook County has one cities and towns with their own local tax assessors. If your property is located within any of these localities, see that page for your tax assessor's contact information.

What can the Cook County Assessor's Office do for me?

The Cook County Tax Assessor's Office oversees the appraisal and assessment of properties as well as the billing and collection of property taxes for all taxable real estate located in Cook County.

Contact the assessor's office if you need help with paying your property taxes, applying for a homestead exemption or other tax exemption, reporting upgrades to your home, appealing your property tax assessment, or verifying your property records.

Submitting a Cook County property tax appeal

If you believe that your house has been unfairly overappraised (i.e. appraised at a value higher than the true market value of the property), you can attempt to get your home re-appraised at a lower value by contacting the Assessor's Office to submit a property tax appeal.

You will have to submit a form describing your property and sufficient proof that it is overassessed, including valuations of similar homes nearby as evidence. If your appeal is accepted, your home assessment (and property taxes) will be lowered as a result.

If you would like to appeal your property, call the Cook County Assessor's Office at (312) 443 7550 and ask for a property tax appeal form. Keep in mind that property tax appeals are generally only accepted in a 1-3 month window each year.

For more information and example appeals, see how to appeal your property taxes.

Useful Cook County Facts:

The median home value in Cook County is between $264,814.00 and $266,786.00. Property tax rates are based on property values.

How can I contact Cook County?

You can try contacting the Cook County local government directly with any issues the Assessor's Office can't solve. In many counties, certain property records such as deeds are kept in the county courthouse or county archives instead of at the tax assessors' office.

The county seat for Cook County is located in the County Building in Chicago, which is located at 118 N Clark St. You can direct your general inquiries to Cook County with the contact info listed below.

Cook County Phone Number


Cook County County Building Address

County Building
118 N Clark St
Chicago, IL 60602-1304