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This is a list of the 22 principal areas of Wales giving their most recent date of creation and the style by which they are known.
The population and density are from the first results of the 2021 census from the Office for National Statistics.
|Cardiff||1996 a||362,400||2,572||140||County (also a city)|
|Swansea||1996 a||238,500||632||378||County (also a city)|
|Rhondda Cynon Taf||1996||237,700||560||424||County borough|
|Newport||1996 a||159,600||838||190||County borough (also a city)|
|Neath Port Talbot †||1996||142,300||322||442||County borough|
|Wrexham||1996||135,100||268||498||County borough (also a city)|
|Vale of Glamorgan||1996||131,800||398||335||County borough|
|Gwynedd *||1974 b||117,400||46||2,535||County|
|Conwy ‡||1996||114,800||102||1,126||County borough|
|Isle of Anglesey||1996 a||68,900||97||711||County|
|Blaenau Gwent||1996||66,900||615||109||County borough|
|Merthyr Tydfil||1996 a||58,800||528||111||County borough|
* = Named as 'Caernarfonshire and Merionethshire' in legislation. Name changed by the council.
† = Named as 'Neath and Port Talbot' in legislation. Name changed by the council.
‡ = Named as 'Aberconwy and Colwyn' in legislation. Name changed by the council.
§ = Named as 'Cardiganshire' in legislation. Name changed by the council.
a = re-instated as a principal administrative authority after a gap
b = boundaries significantly altered in 1996 from its previous incarnation