Sonic hours in Illinois
- Algonquin
- Anna
- Aurora
- Bartlett
- Belleville
- Calumet City
- Carbondale
- Centralia
- Champaign
- Chicago
- Cicero
- Collinsville
- Columbia
- Country Club Hills
- Crest Hill
- Decatur
- Du Quoin
- East Alton
- Edwardsville
- Franklin Park
- Harrisburg
- Highland
- Jacksonville
- Lockport
- Loves Park
- Marion
- Mattoon
- Metropolis
- Montgomery
- Mount Vernon
- Normal
- O Fallon
- Palatine
- Pekin
- Peoria
- Rockford
- Savoy
- Silvis
- Springfield
- Streamwood
- Vandalia
- Villa Park
- Waterloo
- West Frankfort
