Cw
|- class="vcard" | class="fn org" | Cwm | class="adr" | Shropshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwm | class="adr" | Blaenau Gwent | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwm | class="adr" | Neath Port Talbot | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwm | class="adr" | Denbighshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmafan | class="adr" | Neath Port Talbot | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmaman | class="adr" | Rhondda, Cynon, Taff | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmann | class="adr" | Carmarthenshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmavon | class="adr" | Torfaen | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmbach | class="adr" | Powys | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmbach | class="adr" | Carmarthenshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmbach | class="adr" | Rhondda, Cynon, Taff | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmbach Llechrhyd | class="adr" | Powys | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmbelan | class="adr" | Powys | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmbran | class="adr" | Torfaen | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmbrwyno | class="adr" | Ceredigion | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwm Capel | class="adr" | Carmarthenshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmcarn | class="adr" | Caerphilly | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmcarvan | class="adr" | Monmouthshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwm-celyn | class="adr" | Blaenau Gwent | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmcerdinen | class="adr" | Swansea | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwm-Cewydd | class="adr" | Gwynedd | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmcoednerth | class="adr" | Ceredigion | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwm-cou | class="adr" | Carmarthenshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmcrawnon | class="adr" | Powys | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmcych | class="adr" | Pembrokeshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmdare | class="adr" | Rhondda, Cynon, Taff | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwm Dows | class="adr" | Caerphilly | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmdu | class="adr" | Carmarthenshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmdu | class="adr" | Powys | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmdu | class="adr" | Swansea | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmduad | class="adr" | Carmarthenshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwm Dulais | class="adr" | Swansea | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmdwr | class="adr" | Carmarthenshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmerfyn | class="adr" | Ceredigion | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmfelin | class="adr" | Merthyr Tydfil | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmfelin | class="adr" | Bridgend | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmfelin Boeth | class="adr" | Carmarthenshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmfelinfach | class="adr" | Caerphilly | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmfelin Mynach | class="adr" | Carmarthenshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmffrwd | class="adr" | Carmarthenshire | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwm Ffrwd-oer | class="adr" | Torfaen | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwm-Fields | class="adr" | Torfaen | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwm Gelli | class="adr" | Caerphilly | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmgiedd | class="adr" | Powys | class="note" | | class="note" | |- class="vcard" | class="fn org" | Cwmgors | class="adr" | Carm