Welsh-speaking adults in the household by council, Census 2021
Households of each of Wales's 22 councils by Welsh-speaking adults in the household, Census 2021, from the ONS Census API (its “Welsh-speaking adults in household (3 categories)”).
No Welsh-speaking adults in household, highest: Cardiff
128,189
Census Day, 21 March 2021
Verified against source, 30 October 2026, 11:51 UTCSource: Office for National Statistics (Census 2021). Contains public sector information licensed under the Open Government Licence v3.0.
Data table
22 rows
| Area | No Welsh-speaking adults in household | At least one Welsh-speaking adult in household |
|---|---|---|
| Cardiff W06000015 | 128,189 | 19,143 |
| Swansea W06000011 | 91,795 | 13,169 |
| Rhondda Cynon Taf W06000016 | 89,164 | 14,175 |
| Caerphilly W06000018 | 68,439 | 7,818 |
| Newport W06000022 | 62,196 | 3,858 |
| Flintshire W06000005 | 58,281 | 8,630 |
| Bridgend W06000013 | 55,723 | 6,637 |
| Neath Port Talbot W06000012 | 52,496 | 9,882 |
| Vale of Glamorgan W06000014 | 50,749 | 6,701 |
| Wrexham W06000006 | 50,043 | 7,871 |
| Powys W06000023 | 49,362 | 10,820 |
| Pembrokeshire W06000009 | 45,040 | 10,448 |
| Carmarthenshire W06000010 | 44,337 | 37,422 |
| Monmouthshire W06000021 | 38,088 | 2,836 |
| Torfaen W06000020 | 37,560 | 2,681 |
| Conwy W06000003 | 36,930 | 15,305 |
| Denbighshire W06000004 | 31,355 | 11,031 |
| Blaenau Gwent W06000019 | 28,692 | 1,648 |
| Merthyr Tydfil W06000024 | 23,365 | 2,418 |
| Gwynedd W06000002 | 16,601 | 34,502 |
| Ceredigion W06000008 | 15,185 | 15,708 |
| Isle of Anglesey W06000001 | 12,337 | 18,486 |
Map
No Welsh-speaking adults in household · 22 areas, each shaded by the fifth of the areas its figure falls in
- 12k to 29k
- 29k to 44k
- 44k to 51k
- 51k to 68k
- 68k to 128k
Boundaries: Council boundaries, May 2026, from the geography spine. Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026.
Source and licence
- Publisher
- Office for National Statistics (Census 2021)
- Check it yourself
- https://www.ons.gov.uk/datasets/create
- Licence
- Open Government Licence v3.0 – Contains public sector information licensed under the Open Government Licence v3.0.
- Retrieved
- 30 October 2026, 11:44 UTC
- Raw files fetched
- https://api.beta.ons.gov.uk/v1/population-types/HH/census-observations?area-type=ltla23&dimensions=hh_welsh_speaking_adults_3aSHA-256 c65b7a09fae6c38d45d27e4cebaa5a277745dc5d979d1a68ef5bd2870c7461e4 · 312,290 bytes
- https://api.beta.ons.gov.uk/v1/population-types/HH/dimensions?limit=500SHA-256 1d975dc4aefd42401ab90f911470590ac63e6faea9e8fd6f81b555127037b6d3 · 27,052 bytes
Verification
Verified against source, 30 October 2026, 11:51 UTC Run at 30 October 2026, 11:51 UTC; 44 of 44 figures matched the live source.
| Result | Check | Detail |
|---|---|---|
| Pass | Provenance recorded | Office for National Statistics (Census 2021); Open Government Licence v3.0; retrieved 2026-10-30T11:44:28Z; 2 raw file(s) |
| Pass | Raw files match recorded SHA-256 | 2 of 2 files intact |
| Pass | Re-parsing raw files reproduces figures | 44 of 44 figures and the headline reproduced |
| Pass | Figures are finite numbers | 44 figures, 0 invalid |
| Pass | Live source matches every figure | 44 of 44 figures match exactly after downloading 2 source file(s) again (2 byte-identical); the headline matches |
| Pass | The ONS's answer for England and for Wales agrees | in 2 of 2 cells (a category in a nation) the councils sum to the nation's count at https://api.beta.ons.gov.uk/v1/population-types/HH/census-observations?area-type=ctry&dimensions=hh_welsh_speaking_adults_3a within twice the square root of the councils summed (1 exactly; the largest gap 0.21 of its limit), the Census's cell-by-cell perturbation |
| Pass | Source page answers | https://www.ons.gov.uk/datasets/create – HTTP 200 |
Notes
- Census Day was the 21st of March 2021. The ONS perturbs every count slightly to protect privacy, each cell on its own, so a council's categories can add up to a total a few people different from one topic to another, and its councils add up to England's and Wales's counts only within a few dozen.
- By council as the ONS's Census API gives them, its lower-tier local authorities of 2023, with Barnsley's and Sheffield's figures under the codes they had until the 1st of April 2025, as the API gives them. Scotland's and Northern Ireland's censuses are separate, so their councils are not here.
- Every council's categories together count all its households.
- The question was asked in Wales only: the API puts all of England's households under “Does not apply”, so only Wales's 22 councils are here.
- The ONS's description of the topic, “Welsh-speaking adults in household (3 categories)”: Number of adults (aged 16 years and over) who can speak Welsh in households in Wales.