MD 12 heads north from the Virginia border on Snow Hill Road, which is a two-lane undivided road. The road continues south into Virginia as SR 679 (Fleming Road). From the border, the route passes through a mix of woodland and farmland with a few residences in southern Worcester County before reaching Stockton.
MD 12 originates from the Virginia border on Snow Hill Road, a two-lane road that splits into SR 679 (Fleming Road) in Virginia. The route traverses woodland and farmland with some homes in southern Worcester County before arriving at Stockton.