| Locality | Post Code |
|---|---|
| Cassacawn | PL30 |
| Castle-An-Dinas | TR9 6JB |
| Castle Horneck | TR18 4LP |
| Castledore | PL24 2UA |
| Cawsand | PL10 |
| Central Treviscoe | PL26 |
| Chacewater | TR4 |
| Chapel | PL15, TR8 |
| Chapel Amble | PL27 |
| Charlestown | PL25 |
| Chilsworthy | PL18 9PB |
| Chilsworthy Beam | PL18 9AT |
| Chuchtown (Saint Levan) | TR19 |
| Church Cove | TR12 |
| Churchtown | PL30 |
| Chyandour | TR18 3NH |
| Clampits | PL17 8DA |
| Cleers | PL26 8ND |
| Clerkenwater | PL30 4QW |
| Cliff | PL22 0NT |
| Clitters | PL17 |
| Clowance Wood | TR14 0NW |
| Clubworthy | PL15 8NZ |
| Coads Green | PL15 |
| Cocks | TR6 0AT, TR6 0AU |
| Cocksbarrow | PL26 8XT |