New Jersey (USA) is 73% larger than Jamaica.
Area: 10,991 km2 World Factbook
Population: 2,930,050 (July 2014) World Factbook
Jamaica is an island country situated in the Caribbean Sea, comprising the third-largest island of the Greater Antilles. Wikipedia
New Jersey is a state in the Northeastern and Middle Atlantic regions of the United States. It is bordered on the north and east by New York State, on the southeast and south by the Atlantic Ocean, on the west by Pennsylvania, and on the southwest by Delaware. Wikipedia