The Secretary of State is no longer sending out License Plate renewal reminders through the mail! So it's up to us to remember to renew when our plates expire.
You can go online to Cyberdrive Illinois [ https://www.ilsos.gov/greenmail/ ] and request a renewal notice be sent by e-mail to you, but you will need your registration card and PIN number, which is on the bottom of your Registration Identification Card.
Here is the notice from the Secretary of State's site http://www.cyberdriveillinois.com/ :
Due to the lack of a state budget, the Secretary of State's office is suspending the mailing of vehicle registration renewal reminder notices. By suspending this service, which will save approximately $450,000 per month, the office will be able to prolong the ability to mail vehicle registration renewal stickers, titles and license plates to vehicle owners for a few months longer before the postage account is depleted. Vehicle owners are encouraged to be mindful of their vehicle registration status. Motorists can sign up to receive reminder notices electronically by email.