Post Office – Londonderry, Creggan – Opening Hours & Branch Details Post Office occupies an ideal location on Rathmor Centre, about a 1.17 mile drive west of the centre of Londonderry (by Saint Mary’s Church and City Cemetery). The branch looks forward to serving the customers of Rosemount, Bogside, Prehen, Brandywell, Foyle Springs, Londonderry/derry, Pennyburn and Clooney. Today’s working hours (Friday) are from 8:15 am until 5:30 pm. Here you’ll find some information about Post Office Londonderry, Creggan, including the opening times, place of business address or phone info.