The constituency was defined as consisting of six urban districts: Abram, Ashton in Makerfield, Billinge & Winstanley, Ince-in-Makerfield, Orrell, and Skelmersdale & Holland.
The electoral district was made up of six urban areas: Abram, Ashton in Makerfield, Billinge & Winstanley, Ince-in-Makerfield, Orrell, and Skelmersdale & Holland.