Post office in Sixes (Oregon) Find any Post office in Sixes, Oregon state. Addresses, phone numbers, working hours and other information. Quick go: All categories Airport Campground Cemetery Establishment Fire station Food General contractor Lodging Park Post office Sixes Post Office Establishment, Post office Sixes, Sixes, OR 97476 Categories of organizations All categories Airport Campground Cemetery Establishment Fire station Food General contractor Lodging Park Post office