Place
- Illinois--Chebanse2
- Illinois--Cherry Valley2
- Illinois--Chicago Suburban Area2
- Illinois--Chillicothe2
- Illinois--Chrisman2
- Illinois--Christopher2
- Illinois--Clay City2
- Illinois--Clayton2
- Illinois--Collinsville2
- Illinois--Columbia2
- Illinois--Coulterville2
- Illinois--Creal Springs2
- Illinois--Crete2
- Illinois--Decatur2
- Illinois--Downers Grove2
- Illinois--Dundee2
- Illinois--Dwight2
- Illinois--East Alton2
- Illinois--East Dubuque2
- Illinois--East Galesburg2