| Name | Locality | Local Authority | Administrative area |
| Yr Aber | Holywell | Sir y Fflint / Flintshire | Sir Y Fflint / Flintshire |
| Yr Ala | Pwllheli | Gwynedd / Gwynedd | Gwynedd / Gwynedd |
| Yr Ala | Pwllheli | Gwynedd / Gwynedd | Gwynedd / Gwynedd |
| Yr Allt | Llantrisant | Rhondda Cynon Taf / Rhondda Cynon Taf | Rhondda Cynon Taf / Rhondda Cynon Taf |
| Yr Angorfa | Conwy | Conwy / Conwy | Conwy / Conwy |
| Yr Aran | Dunvant | Abertawe / Swansea | Abertawe / Swansea |
| Yr Ardd Fawr | Llanengan | Gwynedd / Gwynedd | Gwynedd / Gwynedd |
| Yr Efail | Llangan | Bro Morgannwg / the Vale of Glamorgan | Bro Morgannwg / The Vale of Glamorgan |
| Yr Elain | Dunvant | Abertawe / Swansea | Abertawe / Swansea |
| Yr Encil | Llanfaelog | Sir Ynys Mon / Isle of Anglesey | Sir Ynys Mon / Isle of Anglesey |
| Yr Encil | Abergele | Conwy / Conwy | Conwy / Conwy |
| Yr Erw | Rhosllanerchrugog | Wrecsam / Wrexham | Wrecsam / Wrexham |
| Yr Graig | Llantrisant | Rhondda Cynon Taf / Rhondda Cynon Taf | Rhondda Cynon Taf / Rhondda Cynon Taf |
| Yr Hafan | Bala | Gwynedd / Gwynedd | Gwynedd / Gwynedd |
| Yr Hafod | Llandybie | Sir Gaerfyrddin / Carmarthenshire | Sir Gaerfyrddin / Carmarthenshire |
| Yr Hafod | Llanelli | Sir Gaerfyrddin / Carmarthenshire | Sir Gaerfyrddin / Carmarthenshire |
| Yr Hafod | Llangyfelach | Abertawe / Swansea | Abertawe / Swansea |
| Yr Harbwr | Llanengan | Gwynedd / Gwynedd | Gwynedd / Gwynedd |
| Yr Helfa | Chirk | Wrecsam / Wrexham | Wrecsam / Wrexham |
| Yr Helyg | Coychurch Higher | Pen-y-bont ar Ogwr / Bridgend | Pen-y-bont Ar Ogwr / Bridgend |
| Yr Hen Berlan | Hawarden | Sir y Fflint / Flintshire | Sir Y Fflint / Flintshire |
| Yr Hen Berllan | Caerhun | Conwy / Conwy | Conwy / Conwy |
| Yr Hen Erddi | Caia Park | Wrecsam / Wrexham | Wrecsam / Wrexham |
| Yr Hen Gorlan | Gowerton | Abertawe / Swansea | Abertawe / Swansea |
| Yr Hen Laethdy | Merthyr Vale | Merthyr Tudful / Merthyr Tydfil | Merthyr Tudful / Merthyr Tydfil |
| Yr Hen Ysgol | Bethesda | Gwynedd / Gwynedd | Gwynedd / Gwynedd |
| Yr Hen Ysgol | Aberdare | Rhondda Cynon Taf / Rhondda Cynon Taf | Rhondda Cynon Taf / Rhondda Cynon Taf |
| Yr Hendre | Pyle | Pen-y-bont ar Ogwr / Bridgend | Pen-y-bont Ar Ogwr / Bridgend |
| Yr Hirgylch | Panteg | Tor-faen / Torfaen | Tor-faen / Torfaen |
| Yr Hobin Cast | Rhosllanerchrugog | Wrecsam / Wrexham | Wrecsam / Wrexham |
| Yr Hwylfa | Caernarfon | Gwynedd / Gwynedd | Gwynedd / Gwynedd |
| Yr Ochr | Chirk | Wrecsam / Wrexham | Wrecsam / Wrexham |
| Yr Ochr | Llangollen | Sir Ddinbych / Denbighshire | Sir Ddinbych / Denbighshire |
| Yr Ochr | Llangollen Rural | Wrecsam / Wrexham | Wrecsam / Wrexham |
| Yr Ogof | Holyhead | Sir Ynys Mon / Isle of Anglesey | Sir Ynys Mon / Isle of Anglesey |
| Yr Rhos | Dinas Cross | Sir Benfro / Pembrokeshire | Sir Benfro / Pembrokeshire |
| Yr Ydlan | Argoed | Sir y Fflint / Flintshire | Sir Y Fflint / Flintshire |
| Yr Ynys | Cornelly | Pen-y-bont ar Ogwr / Bridgend | Pen-y-bont Ar Ogwr / Bridgend |
| Yr Ynys | Bethesda | Gwynedd / Gwynedd | Gwynedd / Gwynedd |
| Yr Ysfa | Maesteg | Pen-y-bont ar Ogwr / Bridgend | Pen-y-bont Ar Ogwr / Bridgend |
| Yr-hen-lawnt | Pen-y-Graig | Rhondda Cynon Taf / Rhondda Cynon Taf | Rhondda Cynon Taf / Rhondda Cynon Taf |
