UK public data, by local authority district
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The population stood at 326,671 in 2025. That is 0.4% lower than a year earlier.

Why the caveats matter

Every figure carries the publisher's own caveats. Where a statistic is published for a wider area than the one you clicked, or where the publisher itself flags it as unreliable, the page says so rather than quietly rounding it off.

The UK's four nations publish separately, so some figures stop at a border: house sale prices cover England and Wales, road collisions Great Britain. Pupil absence is published for England, but not every English district individually — some are reported only as part of their wider county. An area with fewer datasets isn't missing data — either its nation publishes that statistic through a different body, or (pupil absence only) its own district isn't reported separately.

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Population estimate — Hillingdon

326,671, latest 2025 (-0.4% year on year, from 327,886).

The population stood at 326,671 in 2025. That is 0.4% lower than a year earlier. The series peaked at 327,886 in 2024; the latest figure is 0.4% below that peak. Its low point was 234,384 in 1991; the latest reading is 39% above that.

Show the numbers (35 periods)
Population estimate — Hillingdon, every published period
PeriodValue
2025326,671
2024327,886
2023322,383
2022312,493
2021305,107
2020306,460
2019305,641
2018302,263
2017299,469
2016297,451
2015294,011
2014290,225
2013285,982
2012281,263
2011275,499
2010269,465
2009265,665
2008261,051
2007256,981
2006254,387
2005251,430
2004248,691
2003248,054
2002247,063
2001245,616
2000245,911
1999245,053
1998243,587
1997242,901
1996241,958
1995240,146
1994238,708
1993235,675
1992234,457
1991234,384

What these terms mean

Mid-year estimate
A modelled count of the population on 30 June, updated between censuses. It is an estimate, not a headcount. Source
Local authority district
The council area a statistic is published for -- 361 across the UK. In England these are boroughs, districts and unitary authorities; in Scotland, council areas; in Wales, principal areas; in Northern Ireland, districts.

Before you use these figures

  • Mid-year estimate, not a census count: This is a modelled mid-year (30 June) estimate, not a direct headcount. It is rebased periodically against the latest UK census results -- the current series was rebased to the 2021/2022 censuses, replacing previously published estimates for 2011 to 2022. Figures for the same year can therefore change between publications as later data becomes available.
  • Unrounded, but not precise to the individual: Figures are published unrounded to enable further calculation, but ONS is explicit that small estimates should not be read as accurate to a specific person -- they are produced using statistical models and disclosure-control methods, not a direct count.

Cite this figure:

Population estimate — Hillingdon
326,671 for Hillingdon, 2025
Caveats: Mid-year estimate, not a census count; Unrounded, but not precise to the individual
StatsMapped last confirmed this figure unchanged on 5 Sep 2026.
Source: Office for National Statistics, Population Estimates (via Nomis)
https://statsmapped.com/united-kingdom/local-authority/hillingdon/population-estimate

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