Early and mail voting is underway in the Illinois primary. Don’t cast your ballot in ignorance. Square’s here to help.

■ Feb. 17: Last day for regular (paper) voter registration.
■ Feb. 18: First day of grace period for in-person voter registration and voting at election authority and early voting sites; continues through Election Day.
■ March 1: Last day for regular online voter registration.
■ March 12: Last day for your election authority to receive vote-by-mail applications.
■ March 17: Election Day—from 6 a.m. to 7 p.m.Be ready.
■ Learn how to vote in Illinois from Capitol News Illinois and WBEZ.
■ Register to vote in Chicago and suburban Cook County.
■ Outside Cook County? Check your county’s website: DuPage, Lake, Will, Kane, McHenry, Kendall …
■ … or the Illinois State Board of Elections.
■ Outside Cook County? Check your county’s website: DuPage, Lake, Will, Kane, McHenry, Kendall …
■ … or the Illinois State Board of Elections.
Be smart.
■ Here’s a customized ballot with all the decisions you’ll face in suburban Cook County or Chicago.
■ Every item and race on your ballot, explained: BallotReady and Ballotpedia.
■ Every item and race on your ballot, explained: BallotReady and Ballotpedia.
■ See what’s on your ballot, courtesy of the League of Women Voters.
■ Consider the Chicago Tribune’s endorsements …
■ … and the Girl, I Guess Progressive Voter Guide.
■ Slice through all those judicial races with bar association ratings of Cook County candidates (still in progress) …
■ … and Injustice Watch’s judicial primary guide (ditto).
■ Have questions for the candidates? WBEZ wants your suggestions here.
Do it.
■ Trouble at your polling place? Call 866-OUR-VOTE.
Go beyond.
■ Get updates around the clock on the Square Bluesky page.
■ Be informed for every election. Sign up for Square email, sent to your inbox (free!) weekday mornings at 10.
■ If you’ve found this useful, you can help keep Square coming with a contribution—of as little as $1, just once.
This is a work in progress.
■ Spot a mistake? Know of another source that’ll help people vote smart? Email Voterguide@ChicagoPublicSquare.com.