Data / Population / Belfast

Population in Belfast

Population in Belfast was 351,927 in 2025, according to the Office for National Statistics (United Kingdom). That is down 0.1% from 2024.

2025, persons351,927
Change on 2024-0.1%
Series high352,3902024
Series low333,8952011

Next release: Thursday, 29 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Population in Belfast, 2011 to 2025

330K335K340K345K350K355K201120142017202020252011: 333,895 persons2012: 334,322 persons2013: 335,881 persons2014: 337,872 persons2015: 340,194 persons2016: 341,111 persons2017: 341,915 persons2018: 343,690 persons2019: 345,391 persons2020: 344,994 persons2021: 344,992 persons2022: 348,005 persons2023: 350,533 persons2024: 352,390 persons2025: 351,927 persons330K335K340K345K350K355K20112016202120252011: 333,895 persons2012: 334,322 persons2013: 335,881 persons2014: 337,872 persons2015: 340,194 persons2016: 341,111 persons2017: 341,915 persons2018: 343,690 persons2019: 345,391 persons2020: 344,994 persons2021: 344,992 persons2022: 348,005 persons2023: 350,533 persons2024: 352,390 persons2025: 351,927 persons
persons. Source: Office for National Statistics, Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM_2002_1). Retrieved 2026-10-11, published 2026-07-29.
All 15 values
Periodpersons
2025351,927
2024352,390
2023350,533
2022348,005
2021344,992
2020344,994
2019345,391
2018343,690
2017341,915
2016341,111
2015340,194
2014337,872
2013335,881
2012334,322
2011333,895

Compared with Northern Ireland

Place2025
Belfast351,927
Northern Ireland1,928,446

Rankings

Definition

Resident population. United Kingdom regions and local authorities: Office for National Statistics estimates for 30 June.

More on how it is measured
  • Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón).
  • Norway: Statistics Norway, 1 January.
  • Iceland and its municipalities: Statistics Iceland, 1 January.
  • United States: Census Bureau population estimates for 1 July.
  • Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.
  • UN World Population Prospects estimates for 1 July cover the years before 1960 and the areas the World Bank does not publish, such as Taiwan.

The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

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How to cite

Office for National Statistics. Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM_2002_1). Contains public sector information licensed under the Open Government Licence v3.0. https://www.nomisweb.co.uk/api/v01/dataset/NM_2002_1.data.json?geography=TYPE480,TYPE424&gender=0&c_age=200&measures=20100&time=2011,latest. Retrieved 2026-10-11.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

Office for National Statistics (United Kingdom). (2026). Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM_2002_1) (Population, Belfast, 2011 to 2025) [Data set]. Retrieved October 11, 2026, from https://www.nomisweb.co.uk/api/v01/dataset/NM_2002_1.data.json?geography=TYPE480,TYPE424&gender=0&c_age=200&measures=20100&time=2011,latest

MLA 9

Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM_2002_1), Population, Belfast, 2011 to 2025. Office for National Statistics (United Kingdom), 29 July 2026, https://www.nomisweb.co.uk/api/v01/dataset/NM_2002_1.data.json?geography=TYPE480,TYPE424&gender=0&c_age=200&measures=20100&time=2011,latest. Invokely, https://invokely.ai/en/population/belfast-uk. Accessed 11 Oct. 2026.

Chicago (author-date)

Office for National Statistics (United Kingdom). 2026. Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM_2002_1). Population, Belfast, 2011 to 2025. Dataset. Accessed October 11, 2026. https://www.nomisweb.co.uk/api/v01/dataset/NM_2002_1.data.json?geography=TYPE480,TYPE424&gender=0&c_age=200&measures=20100&time=2011,latest. Also distributed by Invokely, https://invokely.ai/en/population/belfast-uk.

Harvard

Office for National Statistics (United Kingdom) (2026) Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM_2002_1), Population, Belfast, 2011 to 2025 [Dataset]. Available at: https://www.nomisweb.co.uk/api/v01/dataset/NM_2002_1.data.json?geography=TYPE480,TYPE424&gender=0&c_age=200&measures=20100&time=2011,latest, via Invokely: https://invokely.ai/en/population/belfast-uk (Accessed: 11 October 2026).

BibTeX
@misc{office_population_belfast_2025,
  author = {{Office for National Statistics (United Kingdom)}},
  title = {{Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM\_2002\_1): Population, Belfast, 2011 to 2025}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.nomisweb.co.uk/api/v01/dataset/NM_2002_1.data.json?geography=TYPE480,TYPE424&gender=0&c_age=200&measures=20100&time=2011,latest},
  urldate = {2026-10-11},
  note = {Accessed via Invokely, https://invokely.ai/en/population/belfast-uk. Publisher attribution: Office for National Statistics. Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM\_2002\_1). Contains public sector information licensed under the Open Government Licence v3.0. https://www.nomisweb.co.uk/api/v01/dataset/NM\_2002\_1.data.json?geography=TYPE480,TYPE424\&gender=0\&c\_age=200\&measures=20100\&time=2011,latest. Retrieved 2026-10-11.},
}
RIS
TY  - DATA
AU  - Office for National Statistics (United Kingdom)
TI  - Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM_2002_1): Population, Belfast, 2011 to 2025
PY  - 2026
DA  - 2026/07/29
PB  - Office for National Statistics (United Kingdom)
DB  - Invokely
UR  - https://www.nomisweb.co.uk/api/v01/dataset/NM_2002_1.data.json?geography=TYPE480,TYPE424&gender=0&c_age=200&measures=20100&time=2011,latest
L2  - https://invokely.ai/en/population/belfast-uk
Y2  - 2026/10/11
N1  - Accessed via Invokely, https://invokely.ai/en/population/belfast-uk.
N1  - Publisher attribution: Office for National Statistics. Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM_2002_1). Contains public sector information licensed under the Open Government Licence v3.0. https://www.nomisweb.co.uk/api/v01/dataset/NM_2002_1.data.json?geography=TYPE480,TYPE424&gender=0&c_age=200&measures=20100&time=2011,latest. Retrieved 2026-10-11.
ER  -
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Questions

What is the population in Belfast?

Population in Belfast was 351,927 in 2025, according to the Office for National Statistics (United Kingdom). That is down 0.1% from 2024.

Where does this figure come from?

Office for National Statistics (United Kingdom). Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM_2002_1). Retrieved by Invokely on 2026-10-11.

What was the highest population in Belfast?

352,390 in 2024, the highest value since 2011 in this series.

Population elsewhere in Northern Ireland

Related statistics for Belfast

All statistics for Belfast | Belfast in figures