UK public data, by local authority district
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The population stood at 58,362 in 2025. That is 0.6% 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 — Merthyr Tydfil

58,362, latest 2025 (-0.6% year on year, from 58,722).

The population stood at 58,362 in 2025. That is 0.6% lower than a year earlier. The series peaked at 59,764 in 1992; the latest figure is 2.3% below that peak. Its low point was 55,955 in 2003; the latest reading is 4% above that.

Show the numbers (35 periods)
Population estimate — Merthyr Tydfil, every published period
PeriodValue
202558,362
202458,722
202358,735
202258,866
202158,869
202059,194
201959,255
201859,349
201759,337
201659,247
201558,922
201458,859
201358,791
201258,869
201158,851
201058,493
200958,156
200857,688
200757,173
200656,627
200556,259
200456,020
200355,955
200255,996
200156,207
200056,218
199956,516
199857,148
199757,371
199658,132
199558,658
199459,346
199359,517
199259,764
199159,594

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 — Merthyr Tydfil
58,362 for Merthyr Tydfil, 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/merthyr-tydfil/population-estimate

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