Post Office – Omagh, Mountfield – Opening Hours & Branch Details Post Office can be found at 16A Main Street, a 6.55 mile distance north-east from the centre of Omagh. This branch serves people from the locales of Mountfield, Aghalane, Facgary, Cloghogle, The Kiln Pot, Killin, Eshmeanagh Mountain and Mulnafye. If you would like to swing by today (Friday), it is open 7:00 am – 10:00 pm. Read the specifics on this page for Post Office Omagh, Mountfield, including the working hours, branch location, product ranges and more.