Mae'r rhestr yma yn dangos yr awdurdodau unedol a ddaeth i fodolaeth yn ffurfiol ar 1 Ebrill 1996 ynghyd a poblogaeth pob sir (o amcangyfrifon 2002). Cliciwch ar unrhyw sir i weld fap o ffiniau'r ardal. Nodwch: Fe ddewisodd rhai awdurdodau i gadw ei henwau hanesyddol yn hytrach na'r enwau swyddogol a roddwyd iddynt yn wreiddiol, felly dyma'r enwau a ddangosir yma.
This list shows the unitary authorities which came into existance on 1 April 1996 together with each county's population (from 2002 estimates). Click on any name to see a boundary map of the area. Note: Some of the counties chose to use their historical names rather than the official names given to them originally, so those are the names shown here.
| Abertawe / Swansea | 223,500 |
| Bro Morgannwg / The Vale of Glamorgan | 120,000 |
| Blaenau Gwent | 69,300 |
| Caerdydd / Cardiff | 308,500 |
| Caerffili / Caerphilly | 170,200 |
| Castell-Nedd Port Talbot / Neath Port Talbot | 134,600 |
| Casnewydd / Newport | 138,800 |
| Ceredigion | 77,000 |
| Conwy | 110,500 |
| Gwynedd | 117,200 |
| Sir Benfro / Pembrokeshire | 114,100 |
| Sir Ddinbych / Denbighshire | 94,300 |
| Sir y Fflint / Flintshire | 149,300 |
| Sir Fynwy / Monmouthshire | 84,800 |
| Sir Gaerfyrddin / Carmarthenshire | 175,600 |
| Merthyr Tudful / Merthyr Tydfil | 55,800 |
| Pen-y-bont ar Ogwr / Bridgend | 128,800 |
| Powys | 127,500 |
| Rhondda Cynon Tâf / Rhondda Cynon Taff | 231,000 |
| Torfaen / Torfaen | 90,000 |
| Wrecsam / Wrexham | 129,300 |
| Ynys Môn / Anglesey | 67,700 |