New York State Route 186B is a short state highway located in the town of Haverstraw, Rockland County. It serves as a connector road, linking Route 186 to Route 9W. The route is approximately 1.5 miles long and primarily runs through residential areas. The highway is designated as a part of the New York State highway system and is maintained by the New York State Department of Transportation. It provides access to local businesses and neighborhoods, making it an important route for residents and visitors in the area.