- Cookes Subdivision
- Coral Manor
- Cotswald Subdivision
- Covenant Village
- Cozy Corner
- Cragin
- Crawford Countryside
- Creekwood
- Coffeen
- Coleta
- Colona
- Colp
- Congerville
- Cooksville
- Charter Grove
- Colvin Park
- Coulterville
- Country Club Hills
- Countryside
- Carle Springs
- Cowden
- Coyne Center
- Crainville
- Creal Springs
- Chicken Bristle
- Crest Hill
- Crystal Lawns
- Churchville
- Cullom
- Cherry Point