UK public data, by local authority district
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The population stood at 381,516 in 2025. That is 0.1% 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 — Cardiff

381,516, latest 2025 (-0.1% year on year, from 382,028).

The population stood at 381,516 in 2025. That is 0.1% lower than a year earlier. The series peaked at 382,028 in 2024; the latest figure is 0.1% below that peak. Its low point was 296,941 in 1991; the latest reading is 28% above that.

Show the numbers (35 periods)
Population estimate — Cardiff, every published period
PeriodValue
2025381,516
2024382,028
2023379,539
2022369,640
2021359,824
2020360,287
2019357,137
2018355,125
2017354,348
2016352,982
2015351,600
2014350,949
2013349,982
2012348,084
2011345,442
2010341,402
2009337,656
2008332,790
2007328,196
2006323,766
2005321,001
2004317,099
2003313,246
2002312,021
2001310,088
2000311,443
1999310,320
1998308,601
1997307,321
1996305,345
1995300,764
1994299,085
1993299,185
1992297,429
1991296,941

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 — Cardiff
381,516 for Cardiff, 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/cardiff/population-estimate

See every dataset published for Cardiff

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