If you've voted in Illinois before or provided ID at the time of mail-in registration, you don't need to show ID to vote.

If you're voting in Illinois for the first time, registered to vote by mail, and didn't provide your driver's license number, state ID number, last 4 digits of your Social Security number, a copy of a current and valid photo ID, a utility bill, bank statement, paycheck, government check, or other government documentation that shows your name and address, or student ID with (i) a copy of your lease, or (ii) postmarked mail at current residence, you'll need to provide one of these when you vote in person during early voting or on Election Day.