Population · ONS · Census 2021 (21 March 2021)

All usual residents by local authority, ranked

Every area with a published figure, in order of usual residents, highest first. Equal figures share a rank and are printed as ties; the order within a tie is alphabetical and means nothing.

All of the UK England Wales Scotland Northern Ireland Download all areas (CSV)See the map

#	Area	people	UK percentile
1	Cardiff W06000015	362,308	93
2	Swansea W06000011	238,490	75
3	Rhondda Cynon Taf W06000016	237,651	75
4	Carmarthenshire W06000010	187,897	67
5	Caerphilly W06000018	175,952	62
6	Newport W06000022	159,592	58
7	Flintshire W06000005	154,962	56
8	Bridgend W06000013	145,488	50
9	Neath Port Talbot W06000012	142,289	48
10	Wrexham W06000006	135,117	44
11	Powys W06000023	133,169	42
12	Vale of Glamorgan W06000014	131,939	40
13	Pembrokeshire W06000009	123,360	36
14	Gwynedd W06000002	117,393	32
15	Conwy W06000003	114,741	30
16	Denbighshire W06000004	95,817	17
17	Monmouthshire W06000021	92,957	14
18	Torfaen W06000020	92,276	13
19	Ceredigion W06000008	71,475	5
20	Isle of Anglesey W06000001	68,878	4
21	Blaenau Gwent W06000019	66,904	3
22	Merthyr Tydfil W06000024	58,836	2

How this ranking is made

Usual residents: published count of usual residents.. All usual residents counted at the Census of England and Wales, 2021 and 2011, and the change between them. Counts only: no density until boundary areas are stored.

Source: ONS: ons_census · Census 2021. Boundaries: 2025-05 BGC v2 LAD_MAY_2025_UK_BGC_V2. Percentiles are calculated across the whole UK, so they do not change when the table is filtered to one nation. A ranking compares areas of very different sizes and populations; the figure is the publisher’s own, and its rank is Civometry’s ordering of those published figures.

Cardiff has the highest usual residents of 22 Wales local authorities with a published figure, at 362,308 (Census 2021 (21 March 2021)). Source: ONS: ons_census.

Civometry · All usual residents