Post Office – Carmarthen, Llanddarog – Opening Hours & Branch Details Post Office occupies a location on Llanddarog, a 6.18 mile drive east of the centre of Carmarthen (near Capel Newydd and St Twrog’s Grave Yard). This branch is situated in a convenient location for customers from Porthyrhyd, Llanddarog, Capel Dewi, Cwmisfael and White Hall. If you plan to drop by today (Friday), its opening times are 9:00 am until 5:30 pm. Please see this page for additional information regarding Post Office Carmarthen, Llanddarog, including the operating hours, directions and email address.