| Locality | Post Code |
|---|---|
| Lane End | HP14 |
| Latimer | HP5 |
| Leckhampstead | MK18 |
| Ledburn | LU7 |
| Lee Common | HP16 |
| Lee Gate | HP16 |
| Lenborough | MK18 |
| Ley Hill | HP5 |
| Lillingstone Dayrell | MK18 |
| Lillingstone Lovell | MK18 |
| Little Chalfont | HP6, HP7 |
| Little Frieth | RG9 |
| Little Hampden | HP16 |
| Little Horwood | MK17 |
| Little Ickford | HP18 9HR, HP18 9HS |
| Little Kimble | HP17, HP22 |
| Little Kingshill | HP16 |
| Little Marlow | SL7 |
| Little Meadle | HP17 9UG, HP17 9UP |
| Little Missenden | HP7 |
| Little Tingewick | MK18 4AG |
| Littlecote | MK18 3LN |
| Long Crendon | HP18 |
| Longwick | HP27 |
| Loosley Row | HP27 |
| Loudwater | HP10 |