   barnum island is a hamlet and census-designated place (cdp) in nassau county, new york, united states. the population was 2,414 at the 2010 census. barnum island is an unincorporated area of the town of hempstead. most of barnum island is separated from the village of island park by the lirr's long beach branch rail line to long beach. barnum island has its own fire district, but is under contract with the island park fire department for emergency services. barnum island is included in the island p
Census-designated_places_in_Nassau_County,_New_York Census-designated_places_in_New_York Hamlets_in_Nassau_County,_New_York Hamlets_in_New_York Populated_coastal_places_in_New_York Town_of_Hempstead,_New_York