The county of Hertfordshire in England is divided into twelve^{[nb 1]} parliamentary constituencies. Each of the twelve elects a Member of Parliament (MP) to represent it at the United Kingdom (UK) Parliament in Westminster. As of the 2024 general election, seven of Hertfordshire's MPs are from the Labour Party, three are Conservatives, and two are Liberal Democrats. The county currently has one urban borough constituency (BC) – Watford - while the other eleven are classed as more rural county constituencies (CC).

Context of the 2024 result. The county elected 7 Labour MPs, 3 Conservatives and 2 Liberal Democrats. Dem. MP.

Boundaries of the seats were amended by the 2023 Periodic Review of Westminster constituencies carried out by the Boundary Commission for England, which came into effect from the 2024 general election. Each constituency is made up of whole or partial local government wards, which elect councillors at English local elections. Eleven are designated as county constituencies (in which candidates can spend more per head than their borough counterparts). One is a borough constituency.

^[1]   Conservative †   Labour ‡   Liberal Democrat ¤

Name[nb 2]	Electorate[2]	Majority[3][nb 3]	Member of Parliament[3]		Nearest opposition[3]		Map
Broxbourne CC	75,454	2,858		Lewis Cocking †		Catherine Deakin ‡
Harpenden and Berkhamsted CC	71,635	10,708		Victoria Collins ¤		Nigel Gardner †
Hemel Hempstead CC	70,496	4,857		David Taylor ‡		Andrew Williams †
Hertford and Stortford CC	75,396	4,748		Josh Dean ‡		Julie Marson †
Hertsmere CC	73,256	7,992		Oliver Dowden †		Josh Tapper ‡
Hitchin CC	72,112	7,109		Alistair Strathern ‡		Bim Afolami †
North East Hertfordshire CC	76,849	1,923		Chris Hinchliff ‡		Nikki da Costa †
South West Hertfordshire CC	71,552	4,456		Gagan Mohindra †		Sally Symington ¤
St Albans CC	70,881	19,834		Daisy Cooper ¤		James Spencer †
Stevenage CC	70,370	6,618		Kevin Bonavia ‡		Alex Clarkson †
Watford BC	70,576	4,723		Matt Turmaine ‡		Dean Russell †
Welwyn Hatfield CC	74,535	3,799		Andrew Lewin ‡		Grant Shapps †

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 Hertfordshire with Bedfordshire as a sub-region of the East of England region, with the creation of the cross-county boundary constituency of Hitchin. As a result, Hitchin and Harpenden was abolished, with Harpenden being included in a new constituency named Harpenden and Berkhamsted, along with the towns of Berkhamsted and Tring, previously part of South West Hertfordshire - which in turn gained areas of Three Rivers District, primarily form Watford. These changes had knock-on effects in the rest of the county, with most of the rest of the constituencies undergoing relatively minor boundary changes, the only exceptions being North East Hertfordshire and Stevenage, which remained effectively unchanged (save minor realignments with new ward boundaries).^[4][5][6]

Former name	Boundaries 2010-2024	Current name	Boundaries 2024–present
Broxbourne BC Hemel Hempstead CC Hertford and Stortford CC Hertsmere CC Hitchin and Harpenden CC North East Hertfordshire CC South West Hertfordshire CC St Albans CC Stevenage CC Watford BC Welwyn Hatfield CC		Broxbourne CC Harpenden and Berkhamsted CC Hemel Hempstead CC Hertford and Stortford CC Hertsmere CC Hitchin CC North East Hertfordshire CC South West Hertfordshire CC St Albans CC Stevenage CC Watford BC Welwyn Hatfield CC

For the Fifth Periodic Review of Westminster constituencies, which came into effect ahead of the 2010 general election, the Boundary Commission for England retained the same eleven Hertfordshire constituencies that had existed previously. It did however make slight boundary changes to reduce electoral disparity. The recommendations, which became law with the Parliamentary Constituencies (England) Order 2007, also ensured that local government wards in Hertfordshire would no longer be split between two Parliamentary constituencies.^[7][8]

	Name	Boundaries 1997-2010	Boundaries 2010–present
1	Broxbourne BC
2	Hemel Hempstead CC
3	Hertford and Stortford CC
4	Hertsmere CC
5	Hitchin and Harpenden CC
6	North East Hertfordshire CC
7	South West Hertfordshire CC
8	St Albans CC
9	Stevenage CC
10	Watford BC
11	Welwyn Hatfield CC

Primary data source: House of Commons research briefing - General election results from 1918 to 2019^[9]

The number of votes cast for each political party who fielded candidates in constituencies comprising Hertfordshire in the 2024 general election were as follows:

Party	Votes	%	Change from 2019	Seats	Change from 2019
Labour	177,658	30.5%	7.0%	7	7
Conservative	177,264	30.4%	22.3%	3	7
Liberal Democrats	108,704	18.6%	0.3%	2	1
Reform UK	80,967	13.9%	New	0	New
Green	33,850	5.8%	3.3%	0	0
Others	5,492	0.8%	2.2%	0	0
Total	583,127	100.0		12

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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  Former constituency

  * Constituency for the 2024 United Kingdom general election

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.

  Conservative   Independent   Liberal

  Anti-Waste League   Conservative   Independent   Labour   Liberal   Silver Badge

  Conservative   Labour

  Conservative   Independent   Labour   Liberal Democrats

¹includes an area of Bedfordshire

• List of parliamentary constituencies in the East of England (region)
• History of parliamentary constituencies and boundaries in Hertfordshire
• East of England (European Parliament constituency)
• Hertfordshire County Council
• Hertfordshire local elections