# Population in Hillingdon

Population in Hillingdon was 326,671 in 2025. Source: Office for National Statistics (United Kingdom).

- Indicator id: `population`
- Place id: `gb-la-e09000017`
- Unit: persons
- Definition: Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). Norway: Statistics Norway, 1 January. United States: Census Bureau population estimates for 1 July. United Kingdom regions and local authorities: Office for National Statistics estimates for 30 June. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.
- Note: The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.
- Source: 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) (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)
- Publisher page: https://invokely.ai/en/publishers/ons-uk
- Retrieved: 2026-10-11
- License: Open Government Licence v3.0 (commercial reuse, attribution required)
- Citation: 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.
- Web page: https://invokely.ai/en/population/hillingdon-uk
- API: https://invokely.ai/api/v1/series?indicator=population&place=gb-la-e09000017

| Period | persons |
|---|---:|
| 2025 | 326,671 |
| 2024 | 327,886 |
| 2023 | 322,383 |
| 2022 | 312,493 |
| 2021 | 305,107 |
| 2020 | 306,460 |
| 2019 | 305,641 |
| 2018 | 302,263 |
| 2017 | 299,469 |
| 2016 | 297,451 |
| 2015 | 294,011 |
| 2014 | 290,225 |
| 2013 | 285,982 |
| 2012 | 281,263 |
| 2011 | 275,499 |