What is a Property Index Number (PIN)?

Property Index Number (PIN)

A PIN (Property Index Number) is a 14 digit numerical code for the legal description of a piece of land as it has been defined for the purposes of real estate taxation. Example: 05-13-206-180-0000. Each portion of the code sequentially narrows down to the parcel’s exact location on the county’s tax maps.

How do I find my property’s PIN?

The most common place to find your PIN is your deed, title commitment, tax bill, or other documents you may have from the purchase of your home. If you are not able to locate any of these documents you can use your address to help you locate the PIN by visiting your County’s Assessor’s website.

Please be aware that matches are not guaranteed. There are instances where an address may not be available. In most cases your county’s Assessor’s office will provide a photograph of the property, which can help verify the match of the address to the PIN.

  • To search now for a PIN using an address, visit the your County’s Assessor’s website.

Cook County
Lake County
DuPage County
McHenry County

How to read my property’s PIN

The PIN is a 14-digit number composed of a 10-digit base that is modified for condominiums and leaseholds by adding a four-digit unit suffix. The basic PIN structure is:


  • TT is the TOWNSHIP number 
  • SS is the SECTION number
  • BBB is the BLOCK number
  • PPP is the PARCEL number
  • UUUU is the UNIT number for condominiums and leaseholds (zeros in this portion of the PIN indicate non-condo and non-leasehold PINs)

This system uniquely identifies each tax parcel and makes it possible for tax map users to quickly locate a parcel on a tax map.



PIN = 12-26-328-009-0000