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Lagan Valley

Constituency

South east Northern Ireland. About 116,796 people in 543 square kilometres.

MP for Lagan Valley

Sorcha EastwoodAllianceMP since

They won by 2,959 votes on a 59.7% turnout.

As of , from the UK Parliament Members API. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: UK Parliament, Members API.

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Radon Affected Area by constituency

Worked out by Open Index · 2022

Under 1%90% or more

About 36% of people in Lagan Valley live in a 1 km square that the radon atlas marks as a radon Affected Area.

Majority, 2024 general election
6.0%
Joint 133rd smallest majority of 650
House of Commons Library · Jul 2024
Turnout, 2024 general election
59.7%
Joint 311th lowest turnout of 650
House of Commons Library · Jul 2024
Population
112,010
113th most populated of 650
ONS Census 2021 · 2021
People in radon Affected Area squares
36%
UK 44%
Worked out by Open Index

2024 general election result

Candidates in Lagan Valley at the general election on 4 July 2024, in finishing order
CandidatePartyVotesShare
Sorcha-Lucy EastwoodElectedAlliance18,61837.9%
Jonathan BuckleyDemocratic Unionist Party15,65931.9%
Robbie ButlerUlster Unionist Party11,15722.7%
Lorna SmythTraditional Unionist Voice2,1864.5%
Simon LeeSocial Democratic & Labour Party1,0282.1%
Patricia DenvirGreen Party Northern Ireland4330.9%
Electorate
82,201
Turnout
59.7%
Majority
2,959 (6.0%)
Valid votes
49,081
Rejected ballots
162

Polling day . Shares are of valid votes; turnout is valid votes as a share of the electorate. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: House of Commons Library, UK Parliament election results. The result from the House of Commons Library

How Lagan Valley compares

Each dot is a constituency. The black line marks the middle one.

Lagan ValleyMiddle
Majority, 2024 general election650 constituencies, UK · Jul 2024
Majority, 2024 general election: every constituency in UK650 areas from 0.0% to 60.6%. The middle area is 14.1%. Lagan Valley is 6.0%.
6.0%joint 133rd smallest majority
Turnout, 2024 general election650 constituencies, UK · Jul 2024
Turnout, 2024 general election: every constituency in UK650 areas from 40.0% to 75.2%. The middle area is 60.0%. Lagan Valley is 59.7%.
59.7%joint 311th lowest turnout
Population650 constituencies, UK · 2021
Population: every constituency in UK650 areas from 26,159 to 151,876. The middle area is 100,988. Lagan Valley is 112,010.
112,010113th most populated
People in radon Affected Area squares650 constituencies, UK · 2022
People in radon Affected Area squares: every constituency in UK650 areas from 0.0% to 100.0%. The middle area is 39.0%. Lagan Valley is 36.0%.
36%joint 306th fewest people in radon Affected Areas

Every constituency ranked: population and people in radon affected area squares.

What is the population of Lagan Valley?

Lagan Valley had 112,010 usual residents at the census.

Lagan Valley is the 113th most populated of 650 in the UK.

Figures for the whole of Lisburn and Castlereagh

Most of Lagan Valley lies in Lisburn and Castlereagh. These figures are published for the whole of Lisburn and Castlereagh, not for constituencies, so they describe the council and not Lagan Valley itself. See Lisburn and Castlereagh

Average house price
£240,737
Up 9.7% in a year
HM Land Registry · Jul 2026
Population estimate
152,367
Up 0.5% in a year
ONS population estimates · 2025
Female life expectancy
83.8years
UK 83.0 years
ONS life expectancy · 2022 to 2024
Gigabit broadband coverage
96.4%
UK 87.8%
Ofcom · Jan 2026
Lagan Valley in brief

The winner in Lagan Valley had a majority of 6.0% of valid votes at the general election on 4 July 2024.

Turnout in Lagan Valley at the general election on 4 July 2024 was 59.7%.

Lagan Valley had 112,010 usual residents at the census.

About 36% of people in Lagan Valley live in a 1 km square that the radon atlas marks as a radon Affected Area.