The approximate coverage of the postcode districts are:
| Postcode district | Post town | Coverage | Local authority area |
|---|---|---|---|
| OL1 | OLDHAM | Chadderton, Higginshaw, Oldham | Oldham |
| OL2 | OLDHAM | Heyside, Royton, Shaw | Oldham |
| OL3 | OLDHAM | Delph, Denshaw, Diggle, Dobcross, Greenfield, Uppermill | Oldham |
| OL4 | OLDHAM | Austerlands, Grasscroft, Grotton, Lees, Lydgate, Oldham, Scouthead, Springhead, Waterhead | Oldham |
| OL5 | ASHTON-UNDER-LYNE | Mossley, Mossley Cross | Tameside |
| OL6 | ASHTON-UNDER-LYNE | Ashton-under-Lyne | Tameside |
| OL7 | ASHTON-UNDER-LYNE | Ashton-under-Lyne | Tameside |
| OL8 | OLDHAM | Bardsley, Oldham | Oldham |
| OL9 | OLDHAM | Chadderton, Oldham, Westwood | Oldham |
| OL10 | HEYWOOD | Heywood | Rochdale |
| OL11 | ROCHDALE | Ashworth, Balderstone, Castleton, Norden, Rochdale | Rochdale |
| OL12 | ROCHDALE | Buckley, Facit, Great Howarth, Healy, Hurstead, Rochdale, Shawforth, Wardle, Whitworth | Rochdale/ Rossendale |
| OL13 | BACUP | Bacup, Britannia, Stacksteads | Rossendale |
| OL14 | TODMORDEN | Cornholme, Todmorden, Eastwood, Walsden | Calderdale |
| OL15 | LITTLEBOROUGH | Littleborough, Shore, Smithybridge, Summit | Rochdale |
| OL16 | LITTLEBOROUGH | non-geographic | |
| OL16 | ROCHDALE | Burnedge, Firgrove, Hurstead, Milnrow, Rochdale, Smallbridge, Thornham | Rochdale |
| OL95 | OLDHAM | British Gas | non-geographic |
Read more about this topic: OL Postcode Area