Post Office – Newtown, Tregynon – Opening Hours & Branch Details Post Office occupies an ideal location on The Garage, about a 4.55 mile drive north from the centre of Newtown (a few minutes walk from Ysgol Rhiw Bechan). This branch chiefly serves the patrons in the districts of The Dingle, Pentre, Tregynon, The Dell, Aberhafesp, Bettws Cedewain and Llanllwchaiarn. If you plan to stop by today (Friday), its hours of opening are 8:30 am to 5:30 pm. Here you will find open hours, branch address and customer rating for Post Office Newtown, Tregynon.