Post Office – Castle Douglas, Crossmichael – Opening Hours & Branch Details You will find Post Office situated at an ideal position at 29 Main Street, about 3.43 miles north-west from the centre of Castle Douglas (not far from Main Street). This branch is situated in a convenient locale that essentially serves the people of Townhead of Greenlaw, Glenlochar, Old Bridge of Urr, Crossmichael, Laurieston and Eriff. It is open today (Friday) from 9:30 am – 12:00 pm. Here you can find some essential information about Post Office Castle Douglas, Crossmichael, including the open hours, branch location and customer reviews.