| Locality | Post Code |
|---|---|
| Cheddington | LU7 |
| Chelmscote | LU7 0DT |
| Chenies | WD3 |
| Chesham | HP5 |
| Chesham Bois | HP6 |
| Chetwode | MK18 |
| Chilton | HP18 |
| Chivery | HP23 |
| Cholesbury | HP23 |
| Coleshill | HP7 |
| Crafton | LU7 |
| Creslow | HP22 4EH |
| Cressex Business Park | HP12 |
| Cryers Hill | HP15 |
| Cublington | LU7 |
| Cuddington | HP18 |
| Dadford | MK18 |
| Dagnall | HP4 |
| Dancers End | HP23 |
| Denham | UB9 |
| Denham Garden Village | UB9 |
| Denner Hill | HP16 |
| Dinton | HP17, HP18 |
| Dorney | SL4 |
| Dorney Reach | SL6 |
| Dorton | HP18 |