It leaves Route 39 next to the First Parish Church in downtown Harwich.

The road crosses into Brewster just north of a pass between Seymour Pond, Hinckley's Pond, and Long Pond, 1.5 miles (2.41 km) north of the Mid-Cape Highway.

After 0.5 miles (0.80 km) the Cape Cod Rail Trail bike path crosses over and follows alongside the road for another 1.5 miles (2.41 km).

The road crosses Route 137 after 2 miles (3.22 km).

[citation needed] The entire route is in Barnstable County.