High Quality Content by WIKIPEDIA articles! New York State Route 304 (NY 304) is a New York State Route that is entirely located in Central Rockland County. NY 304 begins at the New Jersey-New York border in Pearl River, New York, and ends at US 9W. Though it crosses both the New York State Thruway and the Palisades Interstate Parkway, it accesses neither of the two major highways. The route was assigned to its current route in 1930 and is a main route in Rockland County.