# Derg B4 South west Derry City and Strabane. 576 people (mid-2024 estimate) in 0.1 square kilometres. Derg B4 had 546 usual residents at the census (NISRA Census 2021). Neighbourhood. Code N20002004. In: [Northern Ireland](https://openindex.co.uk/northern-ireland) › [Derry City and Strabane](https://openindex.co.uk/derry-city-and-strabane) ## Key figures - **Population: 546** (2021). Derg B4 had 546 usual residents at the census (NISRA Census 2021). Joint 3,438th 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/derry-city-and-strabane/neighbourhood/n20002004#f-population - **Gigabit broadband coverage: 99.1%** (January 2026). In Derg B4, 99.1% 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/derry-city-and-strabane/neighbourhood/n20002004#f-gigabit-coverage - **Aged 15 to 64: 65.8%** (2021). 65.8% of residents in Derg B4 were aged 15 to 64 at the census (NISRA Census 2021). Joint 15,206th 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/derry-city-and-strabane/neighbourhood/n20002004#f-age-15-to-64 - **Aged 65 and over: 10.8%** (2021). 10.8% of residents in Derg B4 were aged 65 or over at the census (NISRA Census 2021). Joint 8,132nd 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/derry-city-and-strabane/neighbourhood/n20002004#f-age-65-and-over ## On the map - [Gigabit coverage by neighbourhood](https://openindex.co.uk/map/gigabit-broadband?place=N20002004) (Connected Nations (Ofcom) · January 2026): In Derg B4, 99.1% 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=N20002004) (UK House Price Index · August 2026): Published for whole councils, so the map colours all of Derry City and Strabane. The outline is Derg B4. - [Crime and ASB by neighbourhood](https://openindex.co.uk/map/recorded-crime?place=N20002004) (Police recorded crime and outcomes (data.police.uk) · August 2026): Police recorded 4 crimes and anti-social behaviour incidents in Derg B4 in August 2026. - [Population by neighbourhood](https://openindex.co.uk/map/population?place=N20002004) (Census 2021, England and Wales): Derg B4 had 546 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 Derg B4. [See deprivation across Derry City and Strabane](https://openindex.co.uk/derry-city-and-strabane/deprivation) ## How Derg B4 compares Each neighbourhood against every other neighbourhood the measure covers. | Measure | Derg B4 | Rank | Compared with | | --- | --- | --- | --- | | Population | 546 | joint 112th most populated | 297 neighbourhoods, Derry City and Strabane · 2021 | | Gigabit broadband coverage | 99.1% | joint 128th lowest | 297 neighbourhoods, Derry City and Strabane · Jan 2026 | | Aged 15 to 64 | 65.8% | joint 111th highest | 297 neighbourhoods, Derry City and Strabane · 2021 | | Aged 65 and over | 10.8% | joint 70th lowest | 297 neighbourhoods, Derry City and Strabane · 2021 | ## Is Derg B4 safe? What police records show In the 12 months to August 2026, police recorded crimes and anti-social behaviour in Derg B4 at a rate of 48.6 per 1,000 people. That compares with 79.9 per 1,000 people across Derg B. Across Northern Ireland as a whole, the recorded crime rate was 70.2 per 1,000 people. In August 2026 alone, 4 cases of crime and anti-social behaviour were recorded in Derg B4. In the 12 months to August 2026, the most common types were violence and sexual offences (17), anti-social behaviour (4) and drug offences (3). 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 Derry City and Strabane These figures are published for the whole of Derry City and Strabane, not for each neighbourhood, so they describe all of Derry City and Strabane and not Derg B4 alone. [See Derry City and Strabane](https://openindex.co.uk/derry-city-and-strabane) - **Average house price: £189,474** (August 2026). Derry City and Strabane’s average house price was £189,474 in August 2026 (HM Land Registry). Up 12.4% in a year. Source: UK House Price Index, August 2026. Published 21 October 2026. - **Population estimate: 152,659** (2025). Derry City and Strabane’s population was an estimated 152,659 in mid-2025 (ONS population estimates). Up 0.2% in a year. Source: Mid-year population estimates, 2025. Published 1 October 2026. - **Female life expectancy: 81.2 years** (2022 to 2024). A baby girl born in Derry City and Strabane could expect to live 81.2 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: 99%** (2022). About 99% of people in Derry City and Strabane 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. ## Derg B4 in brief Derg B4 had 546 usual residents at the census. In Derg B4, 99.1% of homes and businesses could get gigabit-capable broadband in January 2026. 65.8% of residents in Derg B4 were aged 15 to 64 at the census. 10.8% of residents in Derg B4 were aged 65 or over at the census. ## About - Type: Neighbourhood - Code: N20002004 - Middle area: [Derg B](https://openindex.co.uk/derry-city-and-strabane/derg-b) - Ward: [Sion Mills †](https://openindex.co.uk/derry-city-and-strabane/ward/sion-mills) - Constituency: [West Tyrone †](https://openindex.co.uk/constituency/west-tyrone) - Council: [Derry City and Strabane](https://openindex.co.uk/derry-city-and-strabane) - Nation: [Northern Ireland](https://openindex.co.uk/northern-ireland) - Area: 0.13 km² - People, mid-2024: 576 † Best fit: the ward and constituency this neighbourhood mostly lies in. Its edges do not follow theirs. ## Next door [Derg C5](https://openindex.co.uk/derry-city-and-strabane/neighbourhood/n20002006), [Derg B3](https://openindex.co.uk/derry-city-and-strabane/neighbourhood/n20002002), [Derg B2](https://openindex.co.uk/derry-city-and-strabane/neighbourhood/n20002001) ## Latest updates for Derg B4 - 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/N20002004 ## How to cite Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/derry-city-and-strabane/neighbourhood/n20002004, or to one figure with its anchor, https://openindex.co.uk/derry-city-and-strabane/neighbourhood/n20002004#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/derry-city-and-strabane/neighbourhood/n20002004