Biggest and smallest places in Wales by population (2025)

Cardiff was the most populated of Wales’s 22 councils in 2025 (population estimate 381,516).

Merthyr Tydfil was the least populated (58,362). The middle council, Vale of Glamorgan, had 135,362.

Map of population estimate across the UKSee it on the map
Population estimate for every council in Wales, highest first. Councils without a figure are listed last with the reason.
RankCouncilValue
1Cardiff381,516
2Swansea249,429
3Rhondda Cynon Taf241,015
4Carmarthenshire190,037
5Caerphilly176,078
6Newport168,584
7Flintshire155,954
8Bridgend146,986
9Neath Port Talbot142,028
10Wrexham137,977
11Vale of Glamorgan135,362
12Powys134,843
13Pembrokeshire125,849
14Gwynedd120,295
15Conwy114,421
16Denbighshire98,247
17Monmouthshire95,329
18Torfaen93,973
19Ceredigion72,696
20Isle of Anglesey68,607
21Blaenau Gwent67,593
22Merthyr Tydfil58,362

Source and method · See it on the map