The OL postcode area, also known as the Oldham postcode area, is a group of postcode districts around Ashton-under-Lyne, Bacup, Heywood, Littleborough, Oldham, Rochdale and Todmorden in England. Whilst including almost all of Oldham and most of the wider Metropolitan Borough of Oldham, it is not exclusive to these areas, extending into most of the...