Although regular voter registration in Illinois ended October 11, residents can still register online through Sunday.
Illinoisans with a state driver's license or an ID issued by the secretary of state's office can register to vote online at the State Board of Elections' website until registration closes October 23.
The first day of early voting officially begins October 24 and runs through November 7. Election Day is November 8.
Illinoisans have until November 3 to request a vote-by-mail ballot.
For Chicago residents, information on early voting sites and voting by mail can be found on the Chicago Board of Election Commissioners' website.
Cook County Clerk David Orr's office has a list of the 52 designated early voting sites in suburban Cook County. The vote-by-mail application for suburban Cook County voters can be found here.
Non-suburban Cook County voters can find early voting and vote-by-mail information on their local clerks' websites.