The A762 begins on the A713 near St John's Town of Dalry. It then runs South, meeting the A712 in New Galloway, before running alongside Loch Ken then down to the A75 at Ringford, meeting the B795 en route.
The road then multiplexes with the A75 for a short distance, before leaving it near Valleyfield and again heading South. The road then runs a short distance before ending on the A711 at Tongland.
The two sections of the A762 were unclassified when the UK's roads were numbered. The sections of road however were soon upgraded- being numbered as the A762 by the early 1930s