High Quality Content by WIKIPEDIA articles! New York State Route 239 (NY 239) was a state highway in eastern Erie County, New York, United States. The southern terminus of the route was at an intersection with NY 354 in Marilla. Its northern terminus was at a junction with U.S. Route 20 (US 20) in the village of Alden. NY 239 was about 3 miles (5 km) in length and named Exchange Street.