A PIN (Property Index Number, also known as a permanent real estate index number) is a numerical code for the legal description of a piece of land as it has been defined for the purposes of real estate taxation. The formatted code points to the parcel’s location on the county’s tax maps.Click to see full answer. In respect to this, how do I find my property index number?If you qualify for the Illinois Property Tax Credit, you will need your Property Index Number, sometimes called “parcel number” or “permanent index number.” This number is located on your county tax bill or assessment notice (for property tax paid on your principal residence during the tax year for which you are filingAlso Know, how do I find my property tax information? Go to that county’s home page and navigate to the link to the tax assessor’s office. Search for the words Property Listings, Property Database or Property Information at the tax assessor’s website. If the assessor maintains online tax records, you’ll find the information you need here. Keeping this in consideration, what is index number in property tax? A PIN (Property Index Number, also known as a permanent real estate index number) is a numerical code for the legal description of a piece of land as it has been defined for the purposes of real estate taxation. The formatted code points to the parcel’s location on the county’s tax maps.What is Property Index?A property index (the Index) is a real estate investment performance index, and generally shows the investment return in a certain investment period. Specifically, the Index is comprised of the income return from rental income, the capital return from changes in real estate value, and the total return of the two.