Cook County property records
How to find your Cook County property index number (PIN)
Your PIN is the 14-digit property identification number Cook County uses for your property. You can find it on your property tax bill or an Assessor notice, or look up the property by address on the Assessor's website.
By Check the County, operated by Embento LLC. Updated September 29, 2026. This is general public-record research information, not legal, tax or appraisal advice.
What does a PIN look like?
For example, 12-34-567-890-0000 shows the 14-digit format with dashes. It is only a format example, not your property's PIN. Condominiums have their own unit PINs, so confirm the number for your specific unit.
Where to find yours
Check your property tax bill or Assessor notice. You can also use the Cook County Assessor's website to look up a property by address.
The PIN identifies the property for filings and for our free property check. Our property search accepts either an address or a PIN.
Continue your research
Once you have the correct PIN, browse township guides or find your township by city for local appeal context. Our appeal office guide explains where the Assessor and Board of Review fit.