You must enter your property number exactly as it appears on your property tax bill or assessment notice. Your property number is found near the top of your property tax bill or assessment notice.
If your property taxes are paid through your mortgage, you may contact your lender for your property number. You may also get this number from your county assessor’s office. A list of counties, with contact information, is under the “Individuals” section of our website. https://www2.illinois.gov/rev/individuals/Pages/illinoiscounties.aspx