# Castlereagh South B5 North east Lisburn and Castlereagh. 630 people (mid-2024 estimate) in 0.1 square kilometres. Castlereagh South B5 had 657 usual residents at the census (NISRA Census 2021). Neighbourhood. Code N20002467. In: [Northern Ireland](https://openindex.co.uk/northern-ireland) › [Lisburn and Castlereagh](https://openindex.co.uk/lisburn-and-castlereagh) ## Key figures - **Population: 657** (2021). Castlereagh South B5 had 657 usual residents at the census (NISRA Census 2021). Joint 5,925th least populated of 46,844. 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/lisburn-and-castlereagh/neighbourhood/n20002467#f-population - **Gigabit broadband coverage: 100.0%** (January 2026). In Castlereagh South B5, 100.0% 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. https://openindex.co.uk/lisburn-and-castlereagh/neighbourhood/n20002467#f-gigabit-coverage - **Aged 15 to 64: 59.5%** (2021). 59.5% of residents in Castlereagh South B5 were aged 15 to 64 at the census (NISRA Census 2021). Joint 11,689th lowest of 46,844. 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/lisburn-and-castlereagh/neighbourhood/n20002467#f-age-15-to-64 - **Aged 65 and over: 23.6%** (2021). 23.6% of residents in Castlereagh South B5 were aged 65 or over at the census (NISRA Census 2021). Joint 13,735th highest of 46,844. 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/lisburn-and-castlereagh/neighbourhood/n20002467#f-age-65-and-over ## On the map - [Gigabit coverage by neighbourhood](https://openindex.co.uk/map/gigabit-broadband?place=N20002467) (Connected Nations (Ofcom) · January 2026): In Castlereagh South B5, 100.0% of homes and businesses could get gigabit-capable broadband in January 2026. - [Average house price by council](https://openindex.co.uk/map/house-prices?place=N20002467) (UK House Price Index · August 2026): Published for whole councils, so the map colours all of Lisburn and Castlereagh. The outline is Castlereagh South B5. - [Crime and ASB by neighbourhood](https://openindex.co.uk/map/recorded-crime?place=N20002467) (Police recorded crime and outcomes (data.police.uk) · August 2026): Police recorded 0 crimes and anti-social behaviour incidents in Castlereagh South B5 in August 2026. - [Population by neighbourhood](https://openindex.co.uk/map/population?place=N20002467) (Census 2021, England and Wales): Castlereagh South B5 had 657 usual residents at the census. Northern Ireland Multiple Deprivation Measure 2017 is published for the Super Output Areas (2001), whose boundaries differ from this neighbourhood’s, so it has no figure for Castlereagh South B5. [See deprivation across Lisburn and Castlereagh](https://openindex.co.uk/lisburn-and-castlereagh/deprivation) ## How Castlereagh South B5 compares Each neighbourhood against every other neighbourhood the measure covers. | Measure | Castlereagh South B5 | Rank | Compared with | | --- | --- | --- | --- | | Population | 657 | joint 41st most populated | 296 neighbourhoods, Lisburn and Castlereagh · 2021 | | Gigabit broadband coverage | 100.0% | joint highest | 296 neighbourhoods, Lisburn and Castlereagh · Jan 2026 | | Aged 15 to 64 | 59.5% | joint 70th lowest | 296 neighbourhoods, Lisburn and Castlereagh · 2021 | | Aged 65 and over | 23.6% | joint 71st highest | 296 neighbourhoods, Lisburn and Castlereagh · 2021 | ## What is the population of Castlereagh South B5? Castlereagh South B5 had 657 usual residents at the census. Castlereagh South B5 is the joint 5,925th least populated of 46,844 in the UK. ## Figures for the whole of Lisburn and Castlereagh These figures are published for the whole of Lisburn and Castlereagh, not for each neighbourhood, so they describe all of Lisburn and Castlereagh and not Castlereagh South B5 alone. [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. - **People in radon Affected Area squares: 32%** (2022). About 32% of people in Lisburn and Castlereagh 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. ## Castlereagh South B5 in brief Castlereagh South B5 had 657 usual residents at the census. In Castlereagh South B5, 100.0% of homes and businesses could get gigabit-capable broadband in January 2026. 59.5% of residents in Castlereagh South B5 were aged 15 to 64 at the census. 23.6% of residents in Castlereagh South B5 were aged 65 or over at the census. ## About - Type: Neighbourhood - Code: N20002467 - Middle area: [Castlereagh South B](https://openindex.co.uk/lisburn-and-castlereagh/castlereagh-south-b) - Ward: [Cairnshill †](https://openindex.co.uk/lisburn-and-castlereagh/ward/cairnshill) - Constituency: [Belfast South and Mid Down †](https://openindex.co.uk/constituency/belfast-south-and-mid-down) - Council: [Lisburn and Castlereagh](https://openindex.co.uk/lisburn-and-castlereagh) - Nation: [Northern Ireland](https://openindex.co.uk/northern-ireland) - Area: 0.13 km² - People, mid-2024: 630 † Best fit: the ward and constituency this neighbourhood mostly lies in. Its edges do not follow theirs. ## Next door [Castlereagh South E1](https://openindex.co.uk/lisburn-and-castlereagh/neighbourhood/n20002472), [Castlereagh South B3](https://openindex.co.uk/lisburn-and-castlereagh/neighbourhood/n20002464), [Castlereagh South B7](https://openindex.co.uk/lisburn-and-castlereagh/neighbourhood/n20002471), [Castlereagh South B2](https://openindex.co.uk/lisburn-and-castlereagh/neighbourhood/n20002460), [Castlereagh South B4](https://openindex.co.uk/lisburn-and-castlereagh/neighbourhood/n20002465), [Castlereagh South A4](https://openindex.co.uk/lisburn-and-castlereagh/neighbourhood/n20002463) ## Latest updates for Castlereagh South B5 - 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/N20002467 ## How to cite Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/lisburn-and-castlereagh/neighbourhood/n20002467, or to one figure with its anchor, https://openindex.co.uk/lisburn-and-castlereagh/neighbourhood/n20002467#f-population. 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/lisburn-and-castlereagh/neighbourhood/n20002467