Post Office – Armagh, Derryhaw – Opening Hours & Branch Details Post Office is located conveniently at 190 Monaghan Road, 5.49 miles south-west from the centre of Armagh (just off A3 / Monaghan Road). The branch is a wonderful addition to the local businesses of Drumacanver, Maddan, Brootally, Tamlaght, Lisglynn, Drumculter, Farnaloy and Dernalea. If you plan to visit today (Friday), its hours of opening are from 9:00 am – 4:00 pm. This page includes information for Post Office Armagh, Derryhaw, including the open hours, place of business info or product ranges.