Elmont is an unincorporated hamlet and census-designated place located in northwestern Hempstead in Nassau County, New York, United States, along its border with the borough of Queens in New York City. The population was 35,265 as of the 2020 census. The hamlet is famous for Belmont Park which hosts the Belmont Stakes, the third leg of the prestigious Triple Crown of thoroughbred racing. Elmont is also home to UBS Arena, home of the NHL's New York Islanders.