Post Office – Newtown, Sarn mobile service – Opening Hours & Branch Details Post Office is proud to be located on Village Hall, approximately a 5.82 mile driving distance east from the centre of Newtown. The branch serves people from the locales of Bachaethlon, Kerry, Trefeglwys, City, Marshbrook, Canton, Acton Scott and Sarn. It’ll be closed for today (Friday). Refer to this page for the specifics on Post Office Newtown, Sarn mobile service, including the business times, street address, telephone number and more information.