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Belfast South and Mid Down

Constituency

East Northern Ireland. About 123,442 people (mid-2024 estimate) in 119 square kilometres.

MP for Belfast South and Mid Down

Claire HannaSocial Democratic & Labour PartyMP since

They won by 12,506 votes on a 58.2% 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.

Open in map

Radon Affected Area by constituency

Worked out by Open Index · 2022

Under 1%90% or more

About 21% of people in Belfast South and Mid Down live in a 1 km square that the radon atlas marks as a radon Affected Area.

Majority, 2024 general election
28.8%
106th largest majority of 650
House of Commons Library · Jul 2024
Turnout, 2024 general election
58.2%
Joint 249th lowest turnout of 650
House of Commons Library · Jul 2024
Population
119,550
53rd most populated of 650
ONS Census 2021 · 2021
People in radon Affected Area squares
21%
UK 44%
Worked out by Open Index

2024 general election result

Candidates in Belfast South and Mid Down at the general election on 4 July 2024, in finishing order
CandidatePartyVotesShare
Claire HannaElectedSocial Democratic & Labour Party21,34549.1%
Kate NichollAlliance8,83920.3%
Tracy KellyDemocratic Unionist Party6,85915.8%
Michael HendersonUlster Unionist Party2,6536.1%
Dan BoucherTraditional Unionist Voice2,2185.1%
Áine GrooganGreen Party Northern Ireland1,5773.6%
Electorate
74,749
Turnout
58.2%
Majority
12,506 (28.8%)
Valid votes
43,491
Rejected ballots
266

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 Belfast South and Mid Down compares

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

Belfast South and Mid DownMiddle
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%. Belfast South and Mid Down is 28.8%.
28.8%106th largest 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%. Belfast South and Mid Down is 58.2%.
58.2%joint 249th lowest turnout
Population650 constituencies, UK · 2021
Population: every constituency in UK650 areas from 26,159 to 151,876. The middle area is 100,988. Belfast South and Mid Down is 119,550.
119,55053rd 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%. Belfast South and Mid Down is 21.0%.
21%joint 245th fewest people in radon Affected Areas

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

What is the population of Belfast South and Mid Down?

Belfast South and Mid Down had 119,550 usual residents at the census.

Belfast South and Mid Down is the 53rd most populated of 650 in the UK.

Figures for the whole of Lisburn and Castlereagh

Most of Belfast South and Mid Down 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 Belfast South and Mid Down itself. See Lisburn and Castlereagh

Average house price
£240,737
Up 9.7% in a year
HM Land Registry · Aug 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
Belfast South and Mid Down in brief

The winner in Belfast South and Mid Down had a majority of 28.8% of valid votes at the general election on 4 July 2024.

Turnout in Belfast South and Mid Down at the general election on 4 July 2024 was 58.2%.

Belfast South and Mid Down had 119,550 usual residents at the census.

About 21% of people in Belfast South and Mid Down live in a 1 km square that the radon atlas marks as a radon Affected Area.