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Welsh principal area: full list
22 local authorities
| Local authority | Nation | GSS code |
|---|---|---|
| Blaenau Gwent | Wales | W06000019 |
| Bridgend | Wales | W06000013 |
| Caerphilly | Wales | W06000018 |
| Cardiff | Wales | W06000015 |
| Carmarthenshire | Wales | W06000010 |
| Ceredigion | Wales | W06000008 |
| Conwy | Wales | W06000003 |
| Denbighshire | Wales | W06000004 |
| Flintshire | Wales | W06000005 |
| Gwynedd | Wales | W06000002 |
| Isle of Anglesey | Wales | W06000001 |
| Merthyr Tydfil | Wales | W06000024 |
| Monmouthshire | Wales | W06000021 |
| Neath Port Talbot | Wales | W06000012 |
| Newport | Wales | W06000022 |
| Pembrokeshire | Wales | W06000009 |
| Powys | Wales | W06000023 |
| Rhondda Cynon Taf | Wales | W06000016 |
| Swansea | Wales | W06000011 |
| Torfaen | Wales | W06000020 |
| Vale of Glamorgan | Wales | W06000014 |
| Wrexham | Wales | W06000006 |