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Castle D3

Neighbourhood

North Belfast. 508 people (mid-2024 estimate) in 0.2 square kilometres.

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Gigabit coverage by neighbourhood

Connected Nations (Ofcom) · January 2026

Under 60%98% or more

In Castle D3, 98.8% of homes and businesses could get gigabit-capable broadband in January 2026.

Population
521
Joint 2,914th least populated of 46,844
ONS Census 2021 · 2021
Gigabit broadband coverage
98.8%
UK 87.8%
Ofcom · Jan 2026
Aged 15 to 64
59.9%
Joint 12,721st lowest of 46,844
ONS Census 2021 · 2021
Aged 65 and over
19.1%
Joint 22,310th highest of 46,844
ONS Census 2021 · 2021

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 Castle D3. See deprivation across Belfast

How Castle D3 compares

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

Castle D3Middle
Population735 neighbourhoods, Belfast · 2021
Population: every neighbourhood in Belfast735 areas from 154 to 2,149. The middle area is 450. Castle D3 is 521.
521joint 238th most populated
Gigabit broadband coverage735 neighbourhoods, Belfast · Jan 2026
Gigabit broadband coverage: every neighbourhood in Belfast735 areas from 48.0% to 100.0%. The middle area is 99.2%. Castle D3 is 98.8%.
98.8%joint 310th lowest
Aged 15 to 64735 neighbourhoods, Belfast · 2021
Aged 15 to 64: every neighbourhood in Belfast735 areas from 28.0% to 97.3%. The middle area is 65.1%. Castle D3 is 59.9%.
59.9%joint 105th lowest
Aged 65 and over735 neighbourhoods, Belfast · 2021
Aged 65 and over: every neighbourhood in Belfast735 areas from 0.1% to 67.8%. The middle area is 14.7%. Castle D3 is 19.1%.
19.1%joint 199th highest

Is Castle D3 safe? What police records show

In the 12 months to August 2026, police recorded crimes and anti-social behaviour in Castle D3 at a rate of 29.5 per 1,000 people.

That compares with 108.6 per 1,000 people across Castle D.

Across Northern Ireland as a whole, the recorded crime rate was 70.2 per 1,000 people.

In August 2026 alone, 0 cases of crime and anti-social behaviour were recorded in Castle D3.

In the 12 months to August 2026, the most common types were anti-social behaviour (6), burglary (5) and violence and sexual offences (2).

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 Belfast

These figures are published for the whole of Belfast, not for each neighbourhood, so they describe all of Belfast and not Castle D3 alone. See Belfast

Average house price
£184,768
Up 7.7% in a year
HM Land Registry · Aug 2026
Population estimate
351,927
Down 0.1% in a year
ONS population estimates · 2025
Female life expectancy
80.5years
UK 83.0 years
ONS life expectancy · 2022 to 2024
People in radon Affected Area squares
14%
UK 44%
Worked out by Open Index
Castle D3 in brief

Castle D3 had 521 usual residents at the census.

In Castle D3, 98.8% of homes and businesses could get gigabit-capable broadband in January 2026.

59.9% of residents in Castle D3 were aged 15 to 64 at the census.

19.1% of residents in Castle D3 were aged 65 or over at the census.