List of parliamentary constituencies in Northumberland

The county of Northumberland is divided into 4 parliamentary constituencies, all of which are county constituencies.

2010 boundary changes
Under the Fifth Periodic Review of Westminster constituencies, the Boundary Commission for England decided to retain Northumberland's constituencies for the 2010 election, making a very small change between Berwick-upon-Tweed and Hexham to realign constituency boundaries with the boundaries of current local government wards.

Proposed boundary changes
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. 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 Northumberland be combined with the Tyne and Wear boroughs of Newcastle upon Tyne and North Tyneside as a sub-region of the North East Region, with the creation of two cross-county boundary constituencies, resulting in the abolition of Berwick-upon-Tweed, Blyth Valley and Wansbeck.

The following seats are proposed in Northumberland:
 * Blyth and Ashington
 * Cramlington and Killingworth (parts also in Newcastle upon Tyne and North Tyneside)
 * Hexham (part in Newcastle upon Tyne)
 * North Northumberland

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 Northumberland in the 2024 general election were as follows:

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

Percentage votes
11983 & 1987 - SDP-Liberal Alliance

22019 - Brexit Party

* Included in Other

Seats
11983 & 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.

1918 to 1950
1 original 1922 victor Hilton Philipson (National Liberal) declared void due to electoral fraud. Mabel Philipson won the subsequent by-election for the Conservatives.

1983 to present
1contains areas of Tyne and Wear