- source: Getty Thesaurus of Geographic Names
- the text in this section is copied from an article in Wikipedia
New Cassel is a hamlet and census-designated place (CDP) in Nassau County, New York, United States. The population was 14,059 at the 2010 census, representing a net gain of 761 over the 2000 census.
New Cassel adjoins the Village of Westbury and is part of the Greater Westbury area. The community is an unincorporated area of the Town of North Hempstead.