SL - Slough
The postal area SL (Slough) comprises of the following post towns; these towns should be written in capital letters when used in addresses.
Postal Districts within SL - Slough
| Country | Post Town | Postal District |
| England | Iver | SL0 |
| Slough | SL1 SL2 SL3 |
|
| Windsor | SL4 | |
| Ascot | SL5 | |
| Maidenhead | SL6 | |
| Marlow | SL7 | |
| Bourne End | SL8 | |
| Gerrards Cross | SL9 |
