Vote By Mail

Any one registered to vote in Illinois can vote by mail.

Registration:

There are options to register online and in person. Find out more here.
Each county must have at least one location where you can register in person through, and on, election day. Find more information through your election authority.
Find out more about what you need to register and in-person voting options here.

Illinois does not have a universal system for ballot tracking. Check on your local election authority's website to see if they do.

Contact your election authority to inquire about the ballot.
If you vote in person, you may be required to sign an affidavit stating you did not receive the mail-in ballot in order to vote a regular in-person ballot. Otherwise you may be required to fill out a provisional ballot (find out more about provisional ballots).

Return your ballot as soon as possible.
You can return your ballot at your local election authority.
You can return it at a designated drop box if there are ones in your county. Check with your election authority or through the Illinois Board of Elections.
If you mail your ballot it must be postmarked by election day (make sure it's in the mail before this day).
You do not need to have correct postage for your ballot to be accepted.
You can also return your ballot with an election judge at your local polling location. But if choosing this option you may want to surrender your ballot and vote in-person so that your ballot does not get lost.

If you have already received your mail ballot, take it with you to an early voting site or your polling place on Election Day and surrender it to an election judge. Your mail ballot should be voided, and you should receive a regular ballot.
If you have not yet received your mail ballot, you should be asked to sign an affidavit certifying you have not received your ballot. You should then be issued a regular ballot.
If you received your mail ballot but lost it, you may sign an affidavit certifying you have not yet voted in this election. You should then be issued a provisional ballot.
If your mail ballot arrives after you have voted but on or before Election Day, you must discard the mail ballot. Do not attempt to vote your mail ballot after you have voted in person. Doing so is a Class 3 felony. (And because voting systems will not allow more than one vote per voter, your mail ballot will be rejected.)
Find your early voting polling location, or your polling location on Election Day.