Historic 1950–1983: The County Borough of Bolton wards of Deane-cum-Lostock, Derby, Halliwell, Heaton, Rumworth, Smithills, and West.
1983–1997: The Borough of Bolton wards of Blackrod, Deane-cum-Heaton, Halliwell, Horwich, Hulton Park, Smithills, and Westhoughton.
1997–2010: The Borough of Bolton wards of Blackrod, Deane-cum-Heaton, Horwich, Hulton Park, Smithills, and Westhoughton.
2010–2024: The Borough of Bolton wards of Heaton and Lostock, Horwich and Blackrod, Horwich North East, Smithills, Westhoughton North and Chew Moor, and Westhoughton South, and the Borough of Wigan ward of Atherton. There were major boundary changes to Bolton West in 1983 when part of its area went to create
Bolton North East, but compensated by taking most of the former
Westhoughton constituency. 2010 saw the town of
Atherton added from the Wigan borough, previously in the
Leigh constituency.
Current Further to the
2023 review of Westminster constituencies which became effective for the
2024 general election, the constituency is defined as comprising the following wards of the Metropolitan Borough of Bolton as they existed on 1 December 2020: • Heaton and Lostock; Horwich and Blackrod; Horwich North East; Hulton; Smithills; Westhoughton North and Chew Moor; Westhoughton South.
The Wigan Borough ward of Atherton was transferred back out, to the new constituency of Leigh and Atherton, offset by the addition of Hulton ward from Bolton South East (abolished). Following a local government boundary review which came into effect in May 2023, the constituency now comprises the following wards of the Metropolitan Borough of Bolton from the 2024 general election: • Heaton, Lostock & Chew Moor; Horwich North; Horwich South & Blackrod; Hulton (nearly all); Smithills; Westhoughton North & Hunger Hill; Westhoughton South; and a very small part of Rumsworth. == Members of Parliament ==