List of parliamentary constituencies in Hertfordshire



The county of Hertfordshire in England is divided into twelve 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).

Constituencies
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.

Boundary changes
The Boundary Commission for England decided not to change Hertfordshire's representation in Parliament for the 2010 election. It did however suggest 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.

Following the abandonment of the Sixth Periodic Review (the 2018 review), the Boundary Commission for England formally launched the 2023 Review on 5 January 2021. Initial proposals were published on 8 June 2021 and, following two periods of public consultation, revised proposals were published on 8 November 2022. The final proposals were published on 28 June 2023.

The commission proposed that Hertfordshire be combined with Bedfordshire as a sub-region of the Eastern Region, with the creation of the cross-county boundary constituency of Hitchin. As a result of the changes, Hitchin and Harpenden was abolished and replaced by a new constituency named Harpenden and Berkhamsted.

Results history
Primary data source: House of Commons research briefing - General election results from 1918 to 2019

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

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

* Included in Other

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

Historical representation by party
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.

1983 to present
1includes an area of Bedfordshire