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All 22 local authorities in Wales ranked by population — Cardiff largest at 381,516, 2025 estimates. Year-on-year change for every area.
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.
22 local authorities make up Wales. Cardiff is the largest, at 381,516; Merthyr Tydfil the smallest, at 58,362. Figures are mid-year population estimates as of 2025, published by Office for National Statistics, Population Estimates (via Nomis).