Suffolk was a Main Line Long Island Rail Road station in along the border between Brentwood and Central Islip in western Suffolk County, New York.HistorySuffolk opened in the present Central Islip village on July 14, 1842 on the south side of the track and on the west side of Islip Avenue . A post office was opened on June 15, 1857, and continued until to January 7, 1874 when it was transferred to Central Islip. This site was selected by President Fisk of the Long Island Rail Road as the most eligible site for a depot, car house, engine house and well, as long as the land on the north and south sides of the track were handed over. The owner on the north side complied, but the owner on the south side refused, so the idea fell flat. This site was on the main and most travelled route between the Town of Smithtown and Islip. This station was closed as it was replaced by the Central Islip depot that was built further east in August – October 1873 and opened on November 4, 1873 as a flag stop. Rail service in the vicinity didn't die out completely however. A team track and a freight spur were located on the northeast and southwest corners of the railroad crossing until 1959, the southwest spur having been used by the Long Island Lighting Company.
