Post Office – Carmarthen, Trelech mobile service – Opening Hours & Branch Details You will find Post Office situated at a convenient position on Maes Cawnen, about 10.62 miles north-west of the centre of Carmarthen (near Ysgol Gynradd Gymunedol Hafodwenog). Patrons can easily travel here from Cwm-Morgan, Clydey, West Cilrhedyn, Bwlch-Y-Groes, Dinas, Trelech and Capel Iwan. Operating hours for today (Friday) are from 10:00 am to 11:30 am. On this page you can find all the information about Post Office Carmarthen, Trelech mobile service, including the branch hours, local navigation, email address and further significant details.