All competitions are posted here: https://www.worldcubeassociation.org/competitions
If there aren't any there (doesn't look like there are), you'll have to wait for one to be announced in your area. Although, you could always organize one of your own.
A three hour drive is a pretty good distance to hope for in a WCA competition. The only active organizer in Illinois is John Brechon, and I don't think he has anything planned in the near future.