UK public data, by local authority district
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The population stood at 249,429 in 2025. That is 0.5% 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 — Swansea

249,429, latest 2025 (-0.5% year on year, from 250,594).

The population stood at 249,429 in 2025. That is 0.5% lower than a year earlier. The series peaked at 250,594 in 2024; the latest figure is 0.5% below that peak. Its low point was 223,463 in 2001; the latest reading is 12% above that.

Show the numbers (35 periods)
Population estimate — Swansea, every published period
PeriodValue
2025249,429
2024250,594
2023248,795
2022242,786
2021237,897
2020238,992
2019238,707
2018239,184
2017239,266
2016239,300
2015239,354
2014239,228
2013239,237
2012239,197
2011238,691
2010237,311
2009235,601
2008234,139
2007232,460
2006230,793
2005229,347
2004228,176
2003226,350
2002224,755
2001223,463
2000224,475
1999225,080
1998225,702
1997226,764
1996227,199
1995227,765
1994228,239
1993229,349
1992229,610
1991229,743

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 — Swansea
249,429 for Swansea, 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/swansea/population-estimate

See every dataset published for Swansea

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