Post Office – Portstewart – Opening Hours & Branch Details Post Office is found in an ideal location at 90 The Promenade, about a 0.23 mile driving distance south of the centre of Portstewart (near The Church of St John The Baptist Agherton Parish and The Promenade). This branch is an excellent addition to the local businesses of West Tullaghmurry, East Tullaghmurry, South Mullaghacall, Herring Pond, North Mullaghacall, Portnahapple, West Ballygelagh and Portstewart Town Centre. Its branch hours are 9:00 am to 5:30 pm today (Friday). Here you will find opening hours, place of business address details and direct number for Post Office Portstewart.