At 1.57 miles (2.53 km) in length, it is the shortest primary state highway in Maine.

[1] SR 206 begins at the intersection of SR 17 and Valley Road on the western side of the Town of Washington.

It runs north on West Washington Road through western Washington through a mostly wooded landscape but many homes that line the road have clearings for small farming activities.

The state route ends at a T-intersection with SR 105 continuing north and east from this intersection.

[2] The entire route is in Washington, Knox County.