Siasconset is a census designated place at the eastern end of Nantucket Island, Massachusetts, United States with an elevation of 52 feet, and a population of 205 at the 2010 census. Although unincorporated, the village has a post office, with the ZIP code 02564. The various spellings of its name, 'Sconset, Sconset, Seconset, Siasconsett, or Sweseckechi led the Board on Geographic Names to designate its official spelling in 1892.