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Belfast South and Mid Down

Constituency

East Northern Ireland. About 123,442 people in 119 square kilometres.

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Population by constituency

Census 2021, England and Wales

Under 93k114k or more

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

Population
119,550
53rd highest of 650
ONS Census 2021 · 2021
Aged 15 to 64
70.5%
62nd highest of 650
ONS Census 2021 · 2021
Aged 65 and over
14.7%
134th lowest of 650
ONS Census 2021 · 2021
Aged under 15
14.8%
95th lowest of 650
ONS Census 2021 · 2021

How Belfast South and Mid Down compares

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

Belfast South and Mid DownMiddle
Population650 constituencys, 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 highest
Aged 15 to 64650 constituencys, UK · 2021
Aged 15 to 64: every constituency in UK650 areas from 52.3% to 82.1%. The middle area is 63.1%. Belfast South and Mid Down is 70.5%.
70.5%62nd highest
Aged 65 and over650 constituencys, UK · 2021
Aged 65 and over: every constituency in UK650 areas from 5.0% to 34.6%. The middle area is 19.3%. Belfast South and Mid Down is 14.7%.
14.7%joint 134th lowest
Aged under 15650 constituencys, UK · 2021
Aged under 15: every constituency in UK650 areas from 9.7% to 24.9%. The middle area is 17.0%. Belfast South and Mid Down is 14.8%.
14.8%joint 95th lowest

Every constituency ranked: population, aged 15 to 64, aged 65 and over and aged under 15.

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 · Jul 2026
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
Claimant rate
2.0%
UK 3.9%
ONS via Nomis · Aug 2026
Belfast South and Mid Down in brief

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

70.5% of residents in Belfast South and Mid Down were aged 15 to 64 at the census.

14.7% of residents in Belfast South and Mid Down were aged 65 or over at the census.

14.8% of residents in Belfast South and Mid Down were aged under 15 at the census.