Effective Monday, September 22, 2025, the Cook County Assessor’s Office located inside the Markham Courthouse will be closed for remodeling until further notice.

The Cook County Assessor is an elected government official who is responsible for establishing fair and accurate property assessments. Valuation of the county's 1.8 million parcels of …

The Cook County Assessor is an elected government official who is responsible for establishing fair and accurate property assessments. Valuation of the county's 1.8 million parcels of …

The mission of the township assessor is to provide information and services which are accessible, prompt, and accurate. Homeowners can visit their local township assessor for assistance.

Homeowners: Please review the bottom left corner of your tax bill to confirm your exemption savings. If you are missing an exemption, submit an online application immediately or …

Illinois law provides the Certificate of Error procedure to allow the Cook County Assessor to apply changes to a property tax bill that has already been issued.

Learn more about exemptions administered by the Assessor's Office. Looking for property tax refunds? If you think you and your mortgage company both paid the taxes for the same …

Your annual tax bill comes from the County Treasurer’s Office in two installments: the first installment is due in March, and the second installment is due in August.

The Certificate of Error process provides homeowners an opportunity to redeem missing exemptions for the current tax year. If you are approved, the savings from the exemption will …

This exemption provides property tax savings with an annual reduction in the equalized assessed value of a property. Click the button below to learn more about eligibility and the documents …