Parliamentary constituencies in West Sussex

The county of West Sussex is divided into 9 parliamentary constituencies - 2 borough constituencies and 7 county constituencies, one of which crosses the county border with East Sussex.

Under the Fifth Periodic Review of Westminster constituencies, the Boundary Commission for England decided to retain the existing 8 constituencies in West Sussex, with minor changes to realign constituency boundaries with those of current local government wards, and to reduce the electoral disparity between constituencies.

See 2023 Periodic Review of Westminster constituencies for further details.

For the 2023 Periodic Review of Westminster constituencies, which redrew the constituency map ahead of the 2024 United Kingdom general election, the Boundary Commission for England opted to combine West Sussex with East Sussex as a sub-region of the South East Region, resulting in the creation of a new cross-county boundary constituency named East Grinstead and Uckfield.

[2][3] The following constituencies were proposed: Containing electoral wards from Adur Containing electoral wards from Arun Containing electoral wards from Chichester Containing electoral wards from Crawley Containing electoral wards from Horsham Containing electoral wards from Mid Sussex Containing electoral wards from Worthing Primary data source: House of Commons research briefing - General election results from 1918 to 2019[4] The number of votes cast for each political party who fielded candidates in constituencies comprising West Sussex in the 2019 general election were as follows: 11983 & 1987 - SDP-Liberal Alliance * Included in Other A cell marked → (with a different colour background to the preceding cell) indicates that the previous MP continued to sit under a new party name.