# Belfast South and Mid Down

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

Claire Hanna has been the Social Democratic & Labour Party MP for Belfast South and Mid Down since July 2024. They won by 12,506 votes on a 58.2% turnout.

Constituency. Code N05000003. In: [Northern Ireland](https://openindex.co.uk/northern-ireland)

## MP and the 2024 result

Claire Hanna has been the Social Democratic & Labour Party MP for Belfast South and Mid Down since July 2024.
They won by 12,506 votes on a 58.2% turnout.

MP: [Claire Hanna](https://members.parliament.uk/member/4827) (Social Democratic & Labour Party).

### General election, 4 July 2024: Belfast South and Mid Down

| Candidate | Party | Votes | Share |
| --- | --- | --- | --- |
| Claire Hanna (elected) | Social Democratic & Labour Party | 21,345 | 49.1% |
| Kate Nicholl | Alliance | 8,839 | 20.3% |
| Tracy Kelly | Democratic Unionist Party | 6,859 | 15.8% |
| Michael Henderson | Ulster Unionist Party | 2,653 | 6.1% |
| Dan Boucher | Traditional Unionist Voice | 2,218 | 5.1% |
| Áine Groogan | Green Party Northern Ireland | 1,577 | 3.6% |

Electorate 74,749. Turnout 58.2%. Majority 12,506 (28.8%). Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: House of Commons Library, UK Parliament election results. https://electionresults.parliament.uk/elections/3288

MP as of 18 October 2026. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: UK Parliament, Members API.

## Key figures

- **Majority, 2024 general election: 28.8%** (July 2024). 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 (House of Commons Library). 106th largest majority of 650. Source: UK Parliament election results, July 2024. Published 4 July 2024. https://openindex.co.uk/constituency/belfast-south-and-mid-down#f-ge2024-majority
- **Turnout, 2024 general election: 58.2%** (July 2024). Turnout in Belfast South and Mid Down at the general election on 4 July 2024 was 58.2% (House of Commons Library). Joint 249th lowest turnout of 650. Source: UK Parliament election results, July 2024. Published 4 July 2024. https://openindex.co.uk/constituency/belfast-south-and-mid-down#f-ge2024-turnout
- **Population: 119,550** (2021). Belfast South and Mid Down had 119,550 usual residents at the census (NISRA Census 2021). 53rd most populated of 650. Source: Census 2021, England and Wales and Scotland's Census 2022 and Census 2021, Northern Ireland, 2021. Published 21 July 2026. https://openindex.co.uk/constituency/belfast-south-and-mid-down#f-population
- **People in radon Affected Area squares: 21%** (2022). 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. UK 44%. Source: Worked out by Open Index from the UKHSA and BGS radon atlas and census output areas. Published 1 December 2022. https://openindex.co.uk/constituency/belfast-south-and-mid-down#f-radon-affected-share

## On the map

- [Radon Affected Area by constituency](https://openindex.co.uk/map/radon-affected-areas?place=N05000003) (Worked out by Open Index · 2022): 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.
- [Average house price by council](https://openindex.co.uk/map/house-prices?place=N05000003) (UK House Price Index · August 2026): Published for whole councils, so the map colours all of Lisburn and Castlereagh, where most of this constituency lies. The outline is Belfast South and Mid Down.
- [Crime and ASB by council](https://openindex.co.uk/map/recorded-crime?place=N05000003) (Police recorded crime and outcomes (data.police.uk) · August 2026): Published for whole councils, so the map colours all of Lisburn and Castlereagh, where most of this constituency lies. The outline is Belfast South and Mid Down.
- [Population by constituency](https://openindex.co.uk/map/population?place=N05000003) (Census 2021, England and Wales): Belfast South and Mid Down had 119,550 usual residents at the census.

## How Belfast South and Mid Down compares

Each constituency against every other constituency the measure covers.

| Measure | Belfast South and Mid Down | Rank | Compared with |
| --- | --- | --- | --- |
| Majority, 2024 general election | 28.8% | 106th largest majority | 650 constituencies, UK · Jul 2024 |
| Turnout, 2024 general election | 58.2% | joint 249th lowest turnout | 650 constituencies, UK · Jul 2024 |
| Population | 119,550 | 53rd most populated | 650 constituencies, UK · 2021 |
| People in radon Affected Area squares | 21% | joint 245th fewest people in radon Affected Areas | 650 constituencies, UK · 2022 |

## 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](https://openindex.co.uk/lisburn-and-castlereagh)

- **Average house price: £240,737** (August 2026). Lisburn and Castlereagh’s average house price was £240,737 in August 2026 (HM Land Registry). Up 9.7% in a year. Source: UK House Price Index, August 2026. Published 21 October 2026.
- **Population estimate: 152,367** (2025). Lisburn and Castlereagh’s population was an estimated 152,367 in mid-2025 (ONS population estimates). Up 0.5% in a year. Source: Mid-year population estimates, 2025. Published 1 October 2026.
- **Female life expectancy: 83.8 years** (2022 to 2024). A baby girl born in Lisburn and Castlereagh could expect to live 83.8 years, based on deaths in 2022 to 2024 (ONS life expectancy). UK 83.0 years. Source: Life expectancy for local areas of the UK, 2022 to 2024. Published 10 December 2025.
- **Gigabit broadband coverage: 96.4%** (January 2026). In Lisburn and Castlereagh, 96.4% of homes and businesses could get gigabit-capable broadband in January 2026 (Ofcom). UK 87.8%. Source: Connected Nations (Ofcom), January 2026. Published 13 May 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.

## About

- Type: Constituency
- Code: N05000003
- Council: [Lisburn and Castlereagh †](https://openindex.co.uk/lisburn-and-castlereagh)
- Nation: [Northern Ireland](https://openindex.co.uk/northern-ireland)
- Area: 119 km²
- People, mid-2024: 123,442*
- Wards: 22
- Middle areas: 54
- Neighbourhoods: 241

* People: worked out by Open Index from neighbourhood estimates, shared out by where people lived at the census (by area in Northern Ireland). This area's edges do not follow neighbourhood edges, so the figure is close but not exact.
† Best fit: the council this constituency mostly lies in. Its edges do not follow it.

## Next door

[Strangford](https://openindex.co.uk/constituency/strangford), [Lagan Valley](https://openindex.co.uk/constituency/lagan-valley), [Belfast East](https://openindex.co.uk/constituency/belfast-east), [Belfast West](https://openindex.co.uk/constituency/belfast-west), [Belfast North](https://openindex.co.uk/constituency/belfast-north)

## Similar places

Constituencies with the closest mix of age and density. [Foyle](https://openindex.co.uk/constituency/foyle), [Belfast North](https://openindex.co.uk/constituency/belfast-north), [Belfast West](https://openindex.co.uk/constituency/belfast-west), [Belfast East](https://openindex.co.uk/constituency/belfast-east), [Upper Bann](https://openindex.co.uk/constituency/upper-bann), [Newry and Armagh](https://openindex.co.uk/constituency/newry-and-armagh).

## Latest updates for Belfast South and Mid Down

- August 2026 house prices published: HM Land Registry and partners · Oct 2026.
- September 2026 rent published: ONS private rents · Oct 2026.
- Nitrogen dioxide (NO2) updated: Defra · Oct 2026.
- 2025 population published: ONS population estimates · Oct 2026.

The same figures as JSON: https://openindex.co.uk/v1/places/N05000003

## How to cite

Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/constituency/belfast-south-and-mid-down, or to one figure with its anchor, https://openindex.co.uk/constituency/belfast-south-and-mid-down#f-ge2024-majority.

Open Index's own text and the figures it works out are licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source data keeps its publishers' licences, named with each figure. Give each figure's period and source with it.

Snapshot 2026.10.9. The HTML page: https://openindex.co.uk/constituency/belfast-south-and-mid-down