Post Office – Londonderry, The Diamond – Opening Hours & Branch Details Visit Post Office at 3 Bishop Street, 0.56 miles west from the centre of Londonderry (near Garden of Relection and The Diamond). This branch serves people principally from the neighborhoods of Pennyburn, Londonderry/derry, Lisnagelvin, Bogside, Altnagelvin, Brandywell, Rosemount and Creggan. It is open 9:00 am – 5:30 pm today (Friday). Please review the specifics on this page for Post Office Londonderry, The Diamond, including the opening times, address details and direct phone.