Parliamentary constituencies in Northumberland

† Conservative   ‡ Labour   ¤ Reform UK See 2023 periodic review of Westminster constituencies for further details.

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 Northumberland 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.

[2] [3] The following seats resulted from the boundary review in Northumberland: 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.

Primary data source: House of Commons research briefing – General election results from 1918 to 2019[4] The number of votes cast for each political party who fielded candidates in constituencies comprising Northumberland in the 2024 general election were as follows: 11983 & 1987 – SDP-Liberal Alliance 22019 – Brexit Party * Included in Other 11983 & 1987 – SDP-Liberal Alliance 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.

Mabel Philipson won the subsequent by-election for the Conservatives.