Montauk is a hamlet and census-designated place in the Town of East Hampton in Suffolk County, New York, on the eastern end of the South Shore of Long Island. As of the 2020 United States census, the CDP's population was 4,318.The CDP encompasses an area that stretches approximately 13 miles from Napeague, New York, to the easternmost tip of New York State at Montauk Point Light. The hamlet encompasses a small area about halfway between the two points.