- C H Taylor's Sanwaldrun Estates
- Cabery
- Cable
- Cache
- Cache Lake
- Cadiz
- Cadwell
- Cahokia
- Cairo
- Cairo Junction
- Caldwell
- Caledonia
- Calhoun
- Calico Island
- Calumet
- Calumet
- Calumet City
- Calumet Park
- Calvin
- Camargo
- Cambon
- Cambria
- Cambridge
- Cambridge Place
- Camden
- Camden
- Cameron
- Camp Algonquin
- Camp Ground
- Camp Grove