List of parliamentary constituencies in County Durham

The unitary authorities of Durham and Borough of Darlington are combined for parliamentary constituency boundaries, being divided into 8 parliamentary constituencies, including 2 cross-county 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 Durham's constituencies for the 2010 election, making minor changes 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 the unitary authority of County Durham be combined 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. It is proposed that the reconfigured Sedgefield constituency is renamed Newton Aycliffe and Spennymoor. Darlington would be included in a Tees Valley sub-division.

The following seats are proposed:

Containing electoral wards in Darlington

Containing electoral wards in County Durham
 * Darlington
 * Stockton West (part also in Stockton-on-Tees)
 * Bishop Auckland
 * Blaydon and Consett (part also in Gateshead in Tyne and Wear)
 * City of Durham
 * Easington
 * Newton Aycliffe and Spennymoor
 * North Durham

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

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

Percentage votes
11983 & 1987 - SDP-Liberal Alliance

* Included in Other

Historical results 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.

1906 to 1918
1victor in January 1910, Christopher Furness, declared void. Fresh by-election held June 1910, won by Stephen Furness.

1983 to 2024
1abolished in 2024, with some areas going to the Blaydon and Consett seat which is mostly in Tyne and Wear