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