The county of Essex (which includes the unitary authorities of Southend-on-Sea and Thurrock) is divided into 18 parliamentary constituencies (sub-classified into six of borough type and twelve of county status, affecting the level of expenses permitted and status of returning officer).

The county saw the majority of its population and seats removed on the creation of the county of Greater London in 1965. Since then, the Conservatives have won a majority of the seats in the revised county. In the 2019 general election, all of Essex's seats were won by Conservative MPs by more than 50% of the vote. However, at the 2024 election, the Conservatives were reduced to ten seats, held on significantly reduced majorities. Labour won five seats, Reform UK two seats, and the Liberal Democrats one.^[1]

  Conservative†   Labour‡   Liberal Democrat¤   Reform#

Constituency[nb 1]	Electorate[2]	Majority[1]	Member of Parliament[1]		Nearest opposition[1]		Map
Basildon and Billericay BC	76,993	20		Richard Holden †		Alex Harrison ‡
Braintree CC	75,662	3,670		James Cleverly †		Matthew Wright ‡
Brentwood and Ongar CC	74,937	5,980		Alex Burghart †		Paul Godfrey #
Castle Point BC	70,923	3,251		Rebecca Harris †		Keiron McGill #
Chelmsford BC	76,454	4,753		Marie Goldman ¤		Vicky Ford †
Clacton CC	75,959	8,405		Nigel Farage #		Giles Watling †
Colchester BC	76,843	8,250		Pam Cox ‡		James Cracknell †
Epping Forest CC	74,553	5,682		Neil Hudson †		Rosalind Doré ‡
Harlow CC	73,479	2,504		Chris Vince ‡		Hannah Ellis †
Harwich and North Essex CC	74,838	1,162		Bernard Jenkin †		Alex Diner ‡
Maldon CC	76,794	6,906		John Whittingdale †		Pamela Walford #
North West Essex CC	76,280	2,610		Kemi Badenoch †		Issy Waite ‡
Rayleigh and Wickford CC	76,422	5,621		Mark Francois †		Grant Randall #
South Basildon and East Thurrock CC	73,322	98		James McMurdock #		Jack Ferguson ‡
Southend East and Rochford CC	70,094	4,027		Bayo Alaba ‡		Gavin Haran †
Southend West and Leigh BC	76,824	1,949		David Burton-Sampson ‡		Anna Firth †
Thurrock BC	73,347	6,474		Jen Craft ‡		Sophie Preston-Hall #
Witham CC	75,064	5,145		Priti Patel †		Rumi Chowdhury ‡

Former name	Boundaries 2010–2024	Current name	Boundaries 2024-present
Basildon and Billericay BC Braintree CC Brentwood and Ongar CC Castle Point BC Chelmsford BC Clacton CC Colchester BC Epping Forest CC Harlow CC Harwich and North Essex CC Maldon CC Rayleigh and Wickford CC Rochford and Southend East CC Saffron Walden CC South Basildon and East Thurrock CC Southend West BC Thurrock BC Witham CC		Basildon and Billericay BC Braintree CC Brentwood and Ongar CC Castle Point BC Chelmsford BC Clacton CC Colchester BC Epping Forest CC Harlow CC Harwich and North Essex CC Maldon CC North West Essex CC Rayleigh and Wickford CC South Basildon and East Thurrock CC Southend East and Rochford CC Southend West and Leigh BC Thurrock BC Witham CC

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 retained the number of constituencies in Essex at eighteen, with minor boundary changes to reflect changes to electoral wards within the county and to bring the electorates within the statutory range. The commission opted to rename Southend West to Southend West and Leigh (although the town of Leigh-on-Sea had already been part of the Southend West constituency prior to the boundary changes), and rename Rochford and Southend East to Southend East and Rochford to acknowledge that Southend-on-Sea had achieved city status during the course of the review.^[3] In addition, Saffron Walden was renamed North West Essex. These changes came into effect from the 2024 general election.

Primary data source: House of Commons research briefing - General election results from 1918 to 2019^[4]

The number votes cast for each political party who fielded candidates in constituencies comprising Essex in the 2024 general election were as follows:^[1]

Party	Votes	%	Change from 2019	Seats	Change from 2019
Conservative	270,382	32.9%	31.6%	10	8
Labour	235,891	28.7%	7.5%	5	5
Reform	179,977	21.9%	New	2	2
Liberal Democrats	78,238	9.5%	1.1%	1	1
Greens	42,582	5.2%	2.9%	0
Others	14,054	1.7%	0.3%	0
Total	821,124	100.0		18

The number of votes cast for each political party who fielded candidates in constituencies comprising Essex in the 2019 general election were as follows:

Party	Votes	%	Change from 2017	Seats	Change from 2017
Conservative	577,118	64.5%	6.0%	18	0
Labour	189,471	21.2%	7.8%	0	0
Liberal Democrats	95,078	10.6%	4.8%	0	0
Greens	20,438	2.3%	0.8%	0	0
Others	12,502	1.4%	3.8%	0	0
Total	894,607	100.0		18

¹1974 & 1979 - Liberal Party; 1983 & 1987 - SDP-Liberal Alliance

* Included in Other

¹1974 & 1979 - Liberal Party; 1983 & 1987 - SDP-Liberal Alliance

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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.

Key: bulk or all of areas marked † form part of present-day Greater London.

  Conservative   Independent Whig   Liberal   Radical   Whig

  Conservative   Independent Labour   Independent Labour Party   Labour   Liberal   Liberal-Labour

  British Socialist (1919-20) / Communist (1920-22)   Coalition Liberal (1918-22) / National Liberal (1922-23)   Coalition National Democratic & Labour   Common Wealth   Conservative   Constitutionalist   Independent   Labour   Liberal   National Liberal (1931-68)   National Socialist

  Common Wealth   Conservative   Labour Independent Group (1949-50)   Labour   National Liberal (1931-68)

  Conservative   Independent   Labour   Liberal Democrats   UKIP

  Conservative   Independent   Labour   Liberal Democrats   Reform   UKIP

• List of parliamentary constituencies in the East of England (region)
• History of parliamentary constituencies and boundaries in Essex
• Historical list of parliamentary constituencies in Essex
• List of former parliamentary constituencies in Essex