| Locality | Post Code |
|---|---|
| Cockwells | TR20 |
| Colan | TR8 |
| Coldvreath | PL26 8LS |
| Comford | TR16 |
| Common Moor | PL14 |
| Congdons Shop | PL15 |
| Connor Downs | TR27 |
| Constantine | TR11 |
| Constantine Bay | PL28 |
| Coombe | PL17, PL26 |
| Coosebean | TR4 9EA |
| Coswarth | TR8 4LZ |
| Cotehele | PL12 6TA |
| Couchs Mill | PL22 |
| Coverack | TR12 |
| Coverack Bridges | TR13 |
| Coxpark | PL18 |
| Crackington Haven | EX23 |
| Crafthole | PL11 |
| Craigmorrick | PL28 8LZ |
| Crantock | TR8 |
| Creegbrawse | TR16 5QF |
| Cremyll | PL10 |
| Criggan | PL26 8QX |
| Crockett | PL17 8HG |
| Crofthandy | TR16 |