# Knockbracken

North east Lisburn and Castlereagh. About 3,924 people (mid-2024 estimate) in 3.5 square kilometres.

Knockbracken had 3,879 usual residents at the census (NISRA Census 2021).

Ward. Code N08000724. In: [Northern Ireland](https://openindex.co.uk/northern-ireland) › [Lisburn and Castlereagh](https://openindex.co.uk/lisburn-and-castlereagh)

## Key figures

- **Population: 3,879** (2021). Knockbracken had 3,879 usual residents at the census (NISRA Census 2021). 1,816th least populated of 8,397. 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/ward/knockbracken#f-population
- **People in radon Affected Area squares: 70%** (2022). About 70% of people in Knockbracken 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/lisburn-and-castlereagh/ward/knockbracken#f-radon-affected-share
- **Gigabit broadband coverage: 97.2%** (January 2026). In Knockbracken, 97.2% 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/ward/knockbracken#f-gigabit-coverage
- **Aged 15 to 64: 64.3%** (2021). 64.3% of residents in Knockbracken were aged 15 to 64 at the census (NISRA Census 2021). Joint 2,571st highest of 8,397. 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/ward/knockbracken#f-age-15-to-64

## On the map

- [Radon Affected Area by ward](https://openindex.co.uk/map/radon-affected-areas?place=N08000724) (Worked out by Open Index · 2022): About 70% of people in Knockbracken 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=N08000724) (UK House Price Index · August 2026): Published for whole councils, so the map colours all of Lisburn and Castlereagh. The outline is Knockbracken.
- [Crime and ASB by ward](https://openindex.co.uk/map/recorded-crime?place=N08000724) (Police recorded crime and outcomes (data.police.uk) · August 2026): Police recorded 8 crimes and anti-social behaviour incidents in Knockbracken in August 2026.
- [Population by ward](https://openindex.co.uk/map/population?place=N08000724) (Census 2021, England and Wales): Knockbracken had 3,879 usual residents at the census.

## How Knockbracken compares

Each ward against every other ward the measure covers.

| Measure | Knockbracken | Rank | Compared with |
| --- | --- | --- | --- |
| Population | 3,879 | 16th most populated | 40 wards, Lisburn and Castlereagh · 2021 |
| People in radon Affected Area squares | 70% | 13th most people in radon Affected Areas | 40 wards, Lisburn and Castlereagh · 2022 |
| Gigabit broadband coverage | 97.2% | 20th lowest | 40 wards, Lisburn and Castlereagh · Jan 2026 |
| Aged 15 to 64 | 64.3% | joint 13th highest | 40 wards, Lisburn and Castlereagh · 2021 |

## Is Knockbracken safe? What police records show

In the 12 months to August 2026, police recorded crimes and anti-social behaviour in Knockbracken at a rate of 17.8 per 1,000 people.
That compares with 52.4 per 1,000 people across Lisburn and Castlereagh.
Across Northern Ireland as a whole, the recorded crime rate was 70.2 per 1,000 people.
In August 2026 alone, 8 cases of crime and anti-social behaviour were recorded in Knockbracken.
In the 12 months to August 2026, the most common types were anti-social behaviour (29), violence and sexual offences (17) and other crime (9).
Worked out by Open Index from police.uk crime records and ONS and NISRA population estimates.
Rates are per resident, so places that many people work in or visit, such as Westminster, the City of London and other city centres, have far higher rates than their residents alone would suggest.

## Figures for the whole of Lisburn and Castlereagh

These figures are published for the whole of Lisburn and Castlereagh, not for each ward, so they describe all of Lisburn and Castlereagh and not Knockbracken 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.
- **Full-fibre broadband coverage: 95.4%** (January 2026). In Lisburn and Castlereagh, 95.4% of homes and businesses could get full-fibre broadband in January 2026 (Ofcom). UK 81.0%. Source: Connected Nations (Ofcom), January 2026. Published 13 May 2026.

## Knockbracken in brief

Knockbracken had 3,879 usual residents at the census.
About 70% of people in Knockbracken live in a 1 km square that the radon atlas marks as a radon Affected Area.
In Knockbracken, 97.2% of homes and businesses could get gigabit-capable broadband in January 2026.
64.3% of residents in Knockbracken were aged 15 to 64 at the census.

## About

- Type: Ward
- Code: N08000724
- 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: 3.53 km²
- People, mid-2024: 3,924*
- Neighbourhoods: 7

* 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 constituency this ward mostly lies in. Its edges do not follow it.

## Next door

[Moneyreagh](https://openindex.co.uk/lisburn-and-castlereagh/ward/moneyreagh), [Cairnshill](https://openindex.co.uk/lisburn-and-castlereagh/ward/cairnshill), [Beechill](https://openindex.co.uk/lisburn-and-castlereagh/ward/beechill), [Carryduff West](https://openindex.co.uk/lisburn-and-castlereagh/ward/carryduff-west), [Newtownbreda](https://openindex.co.uk/lisburn-and-castlereagh/ward/newtownbreda), [Carryduff East](https://openindex.co.uk/lisburn-and-castlereagh/ward/carryduff-east)

## Latest updates for Knockbracken

- 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/N08000724

## How to cite

Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/lisburn-and-castlereagh/ward/knockbracken, or to one figure with its anchor, https://openindex.co.uk/lisburn-and-castlereagh/ward/knockbracken#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/ward/knockbracken