Yaphank is a station in the hamlet of Yaphank, New York on the Main Line (Greenport Branch) of the Long Island Rail Road. It is located on Park Street near Suffolk County Road 21 (Yaphank Avenue). It is also accessible from streets in and around Suffolk County. The distance between Yaphank and the next station, Riverhead, is the longest distance between stations in the LIRR at 14.7 miles (23.7 km).