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There are only 8 places in Wales beginning J which makes it one of the least common letters for a placename. Below is the full list which uses data from Ordnance Survey, including all villages and hamlets. There are no cities or towns in Wales that start with the letter J.

JamestonVillageSA70Sir Benfro - Pembrokeshire
JeffreystonVillageSA68Sir Benfro - Pembrokeshire
Jersey MarineVillageSA10Castell-nedd Port Talbot - Neath Port Talbot
Jingle StreetHamletNP25Sir Fynwy - Monmouthshire
JohnstonVillageSA62Sir Benfro - Pembrokeshire
JohnstownSuburban AreaSA31Sir Gaerfyrddin - Carmarthenshire
JoppaHamletSY23Sir Ceredigion - Ceredigion
OS data © Crown copyright and database right 2022

Kieren is the founder and editor-in-chief of Wales Guidebook. Originally from rural Mid-Wales, he has lived all over the country from Cardiff to Wrexham. A true Welshman, Kieren created this site to share his passion for Wales and help others discover this beautiful country.