Cook County Assessor's Office in Chicago, Illinois

When visiting the county assessor's office, bring your property's parcel number or street address to quickly locate your assessment record, and bring supporting documentation if you are disputing a valuation. Cook County Assessor's Office is located at 118 North Clark Street, Chicago, IL. Many assessor offices also maintain online portals where you can review your assessed value and exemption status before visiting in person.

About Cook County Assessor's Office

The Cook County Assessor's Office, located in Chicago, Illinois, determines the value of all taxable property in Cook County, IL. Taxable property includes land and commercial properties, often referred to as real property or real estate, and fixed assets owned by businesses, often referred to as personal property. Property assessments performed by the Assessor are used to determine the Cook County property taxes owed by individual taxpayers.

• Property assessment values and annual reassessment notices for parcels in Cook County Assessor's Office's jurisdiction
• Homestead, senior citizen, veteran, and disability exemption applications
• Formal assessment appeals and informal review requests
• GIS parcel maps, property boundary data, and ownership record corrections