Post Office – Dumfries, Clarencefield SAS – Opening Hours & Branch Details Post Office is currently located on Main Street, about 8.62 miles south-east from the centre of Dumfries (near to Farmers Inn). People can easily get here from Carrutherstown, Ruthwell, Racks, Clarencefield, Mouswald, Brydekirk and Dalton. Unfortunately, it’ll be closed for all of today (Friday). This page will give you all the information you need on Post Office Dumfries, Clarencefield SAS, including the working hours, place of business address details, email contact and more important info.