The Cook County Assessor’s Office is committed to sharing data about your community. You can find our data releases here, as well as tools you can use to better understand property assessments and their role in Cook County’s property tax system.
You can download the characteristics data used to estimate the values of Cook County homes.
Expert and Fair Valuation
We combine our analysts' expertise with state-of-the-art methods in statistics and data science.
Reports from outside agencies on assessment quality.
Where do I find my PIN?
Your 14-digit Property Index Number (PIN) is printed on your tax bill, your property closing documents and deed, and notices from the Assessor's office (such as your assessment notice).
Enter PIN to see property details
Don’t know the property’s PIN? Search by address.