- Western Terminus:
- Milltown Road (Putnam CR 54) at the New York-Connecticut state line
- Eastern Terminus:
- Ball Pond Road (CT 39) in New Fairfield
- 0.93 miles
Milltown Road is a short diagonal route running northeast from NY 22 in Brewster, New York, to Ball Pond Road (CT 39) in New Fairfield, Connecticut. It is designated CR 54 on the New York side of the state line and has the unsigned designation of SR 839 on the Connecticut side. The entire length is a two-lane undivided road.