List of Parliamentary constituencies in West Sussex

  Conservative †   Labour ‡   Liberal Democrat ¤

Constituency[nb 1]	Electorate[1]	Majority[2][nb 2]	Member of Parliament[2]		Nearest opposition[2]		Electoral wards[3][4]	Map
Arundel and South Downs CC	81,726	22,521		Andrew Griffith †		Alison Bennett ¤	Arun: Angmering, Arundel, Barnham, Findon, Walberton Chichester: Bury, Petworth, Wisborough Green Horsham: Bramber, Upper Beeding & Woodmancote, Chanctonbury, Chantry, Cowfold, Shermanbury & West Grinstead, Henfield, Pulborough & Coldwaltham, Steyning Mid Sussex: Hassocks, Hurstpierpoint & Downs
Bognor Regis and Littlehampton CC	77,446	22,503		Nick Gibb †		Alan Butcher ‡	Arun: Aldwick East, Aldwick West, Beach, Bersted, Brookfield, Felpham East, Felpham West, Ham, Hotham, Marine, Middleton-on-Sea, Orchard, Pagham & Rose Green, Pevensey, River, Wick with Toddington, Yapton
Chichester CC	85,499	21,490		Gillian Keegan †		Kate O'Kelly ¤	Chichester: Bosham, Boxgrove, Chichester East, Chichester North, Chichester South, Chichester West, Donnington, Easebourne, East Wittering, Fernhurst, Fishbourne, Funtington, Harting, Lavant, Midhurst, North Mundham, Plaistow, Rogate, Selsey North, Selsey South, Sidlesham, Southbourne, Stedham, Tangmere, West Wittering, Westbourne
Crawley BC	74,207	8,360		Henry Smith †		Peter Lamb ‡	Crawley: Bewbush, Broadfield North, Broadfield South, Furnace Green, Gossops Green, Ifield, Langley Green, Maidenbower, Northgate, Pound Hill North, Pound Hill South & Worth, Southgate, Three Bridges, Tilgate, West Green
East Worthing and Shoreham CC	75,194	7,441		Tim Loughton †		Lavinia O'Connor ‡	Adur: Buckingham, Churchill, Cokeland, Eastbrook, Hillside, Manor, Marine, Mash Barn, Peverel, St Mary's, St Nicolas, Southlands, Southwick Green, Widewater Worthing: Broadwater, Gaisford, Offington, Selden
Horsham CC	86,730	21,127		Jeremy Quin †		Louise Potter ¤	Horsham: Billingshurst & Shipley, Broadbridge Heath, Denne, Forest, Holbrook East, Holbrook West, Horsham Park, Itchingfield, Slinfold & Warnham, Nuthurst, Roffey North, Roffey South, Rudgwick, Rusper & Colgate, Southwater, Trafalgar Mid Sussex: Ardingly & Balcombe, Copthorne & Worth, Crawley Down & Turners Hill
Mid Sussex CC	85,146	19,197		Mims Davies †		Robert Eggleston ¤	Mid Sussex: Ashurst Wood, Bolney, Burgess Hill Dunstall, Burgess Hill Franklands, Burgess Hill Leylands, Burgess Hill Meeds, Burgess Hill St Andrews, Burgess Hill Victoria, Cuckfield, East Grinstead Ashplats, East Grinstead Baldwins, East Grinstead Herontye, East Grinstead Imberhorne, East Grinstead Town, Haywards Heath Ashenground, Haywards Heath Bentswood, Hayward Heath Franklands, Haywards Heath Heath, Haywards Heath Lucastes, High Weald, Lindfield
Worthing West BC	78,585	14,823		Peter Bottomley †		Beccy Cooper ‡	Arun: East Preston with Kingston, Ferring, Rustington East, Rustington West Worthing: Castle, Central, Durrington, Goring, Heene, Marine, Northbrook, Salvington, Tarring

The Boundary Commission for England submitted their final proposals in respect of the Sixth Periodic Review of Westminster Constituencies (the 2018 review) in September 2018. Although the proposals were immediately laid before Parliament they were not brought forward by the Government for approval. Accordingly, they did not come into effect for the 2019 election which took place on 12 December 2019, and which was contested using the constituency boundaries in place since 2010.

Under the terms of the Parliamentary Voting System and Constituencies Act 2011, the Sixth Review was based on reducing the total number of MPs from 650 to 600 and a strict electoral parity requirement that the electorate of all constituencies should be within a range of 5% either side of the electoral quota.

On 24 March 2020, the Minister of State for the Cabinet Office, Chloe Smith, issued a written statement to Parliament setting out the Government's thinking with regard to parliamentary boundaries.[5] Subsequently, the Parliamentary Constituencies Act 2020[6] was passed into law on 14 December 2020. This formally removed the duty to implement the 2018 review and set out the framework for future boundary reviews. The Act provided that the number of constituencies should remain at the current level of 650, rather than being reduced to 600, while retaining the requirement that the electorate should be no more than +/- 5% from the electoral quota.

The Act specified that the next review should be completed no later than 1 July 2023 and the Boundary Commission formally launched the 2023 Review on 5 January 2021.[7] See 2023 Periodic Review of Westminster constituencies for further details.

Primary data source: House of Commons research briefing - General election results from 1918 to 2019[8]

2019

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:

Party	Votes	%	Change from 2017	Seats	Change from 2017
Conservative	257,463	56.3%	0.6%	8	0
Labour	103,446	22.6%	6.2%	0	0
Liberal Democrats	75,512	16.5%	8.2%	0	0
Greens	17,239	3.8%	1.1%	0	0
Others	3,920	0.8%	2.5%	0	0
Total	457,580	100.0		8

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.

The Local Government Act 1972 moved the District of Mid Sussex into West Sussex from East Sussex. This change was put into effect in the Parliamentary constituency boundaries for the 1983 boundary changes.

• List of Parliamentary constituencies in the South East (region)