The unitary authorities of Durham and Borough of Darlington are divided into 8 parliamentary constituencies, including 2 cross-county constituencies, all of which are county constituencies.
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 the unitary authority of County Durham with the Tyne and Wear boroughs of Gateshead, South Tyneside and Sunderland as a sub-region of the North East Region, with the creation of a cross-county boundary constituency named Blaydon and Consett, resulting in the abolition of North West Durham. The reconfigured Sedgefield constituency was renamed Newton Aycliffe and Spennymoor. The Borough of Darlington was included in a Tees Valley sub-division.
The following seats resulted from the boundary review:
Containing electoral wards in Darlington
Containing electoral wards in County Durham
Under the Fifth Periodic Review of Westminster constituencies, the Boundary Commission for England decided to retain Durham's constituencies for the 2010 election, making minor changes to realign constituency boundaries with the boundaries of current local government wards.
Primary data source: House of Commons research briefing â General election results from 1918 to 2019
The number of votes cast for each political party who fielded candidates in constituencies comprising Durham in the 2024 general election were as follows:
The number of votes cast for each political party who fielded candidates in constituencies comprising Durham in the 2019 general election were as follows:
<sup>1</sup>As the Brexit Party in 2019 <sup>2</sup>1983 & 1987 â SDPâÂÂLiberal Alliance
<nowiki>*</nowiki> Included in Other
A cell marked â (with a different colour background to the preceding cell) indicates that the previous MP continued to sit under a new party name.
<sup>1</sup>victor in January 1910, Christopher Furness, declared void. Fresh by-election held June 1910, won by Stephen Furness.
<sup>1</sup>abolished in 2024, with some areas going to the Blaydon and Consett seat which is mostly in Tyne and Wear