The county of Hertfordshire in England is divided into eleven parliamentary constituencies. Each of the eleven elects a Member of Parliament (MP) to represent it at the United Kingdom (UK) Parliament in Westminster. As of the 2019 general election, ten of Hertfordshire's eleven MPs are Conservatives. The county currently has two urban borough constituencies (BC) – Broxbourne and Watford – while the other nine are classed as more rural county constituencies (CC).

Context of the 2019 result. The county elected 10 Tory MPs and 1 Lib. Dem. MP. Luton, Bedfordshire returned two Labour candidates, it forms a small projection into the county's shape.

Limits of the seats were amended by the Fifth Periodic Review of Westminster constituencies carried out by the Boundary Commission for England for future elections which have included 2010, 2015, 2017 and 2019. Each constituency is made up of whole or partial local government wards, which elect councillors at English local elections. Nine are designated as county constituencies (in which candidates can spend more per head than their borough counterparts). Two are borough constituencies.

^[1]   Conservative †   Labour ‡   Liberal Democrat ¤

More information Name, Electorate ...

Name[nb 1]	Electorate[2]	Majority[3][nb 2]	Member of Parliament[3]		Nearest opposition[3]		Map
Broxbourne BC	73,182	19,807		Charles Walker †[4]		Sean Waters ‡
Hemel Hempstead CC	74,035	14,563		Michael Penning †		Nabila Ahmed ‡
Hertford and Stortford CC	81,765	19,620		Julie Marson †		Chris Vince ‡
Hertsmere CC	73,971	21,313		Oliver Dowden †		Holly Kal-Weiss ‡
Hitchin and Harpenden CC	76,323	6,895		Bim Afolami †		Sam Collins ¤
North East Hertfordshire CC	76,123	18,189		Oliver Heald †		Kelley Green ‡
South West Hertfordshire CC	80,499	14,408		Gagan Mohindra †		David Gauke
St Albans CC	73,727	6,293		Daisy Cooper ¤		Anne Main †
Stevenage CC	71,562	8,562		Stephen McPartland †		Jill Borcherds ‡
Watford BC	83,359	4,433		Dean Russell †		Chris Ostrowski ‡
Welwyn Hatfield CC	74,892	10,955		Grant Shapps †		Rosie Newbigging ‡

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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.^[5][6]

See 2023 Periodic Review of Westminster constituencies for further details.

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.^[7] 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 has 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 would be abolished and replaced by a new constituency named Harpenden and Berkhamsted.^[8][9][10]

The following seats are proposed:

Containing electoral wards in Broxbourne

• Broxbourne (part)

Containing electoral wards in Dacorum

• Harpenden and Berkhamsted (part)
• Hemel Hempstead
• South West Hertfordshire (part)

Containing electoral wards in East Hertfordshire

• Broxbourne (part)
• Hertford and Stortford
• North East Hertfordshire (part)
• Stevenage (part)

Containing electoral wards in Hertsmere

• Hertsmere (part)
• Watford (part)

Containing electoral wards in North Hertfordshire

• Hitchin (part also in Central Bedfordshire)
• North East Hertfordshire (part)
• Stevenage (part)

Containing electoral wards in St Albans

• Harpenden and Berkhamsted (part)
• St Albans

Containing electoral wards in Stevenage

• Stevenage (part)

Containing electoral wards in Three Rivers

• South West Hertfordshire (part)

Containing electoral wards in Watford

• Watford (part)

Containing electoral wards in Welwyn Hatfield

• Hertsmere (part)
• Welwyn Hatfield

Primary data source: House of Commons research briefing - General election results from 1918 to 2019^[11]

2019

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

More information Party, Votes ...

Party	Votes	%	Change from 2017	Seats	Change from 2017
Conservative	317,018	52.7%	1.6%	10	1
Labour	141,143	23.5%	8.6%	0	0
Liberal Democrats	110,006	18.3%	8.4%	1	1
Greens	15,132	2.5%	0.2%	0	0
Others	17,764	3.0%	1.6%	0	0
Total	601,063	100.0		11

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  Former constituency

  * Constituency for the 2017 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.

• 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