OL - Oldham
The postal area OL (Oldham) comprises of the following post towns; these towns should be written in capital letters when used in addresses.
Postal Districts within OL - Oldham
| Country | Post Town | Postal District |
| England | Oldham | OL1 OL2 OL3 OL4 OL5 OL8 OL9 |
| Ashton under Lyne | OL6 OL7 |
|
| Heywood | OL10 | |
| Rochdale | OL11 OL12 OL16 |
|
| Bacup | OL13 | |
| Todmorden | OL14 | |
| Littleborough | OL15 |
