Newark Liberty International Airport is an international airport straddling the boundary between the cities of Newark in Essex County and Elizabeth in Union County, New Jersey, in the United States. Located about 4.5 miles south of downtown Newark and 9 miles west-southwest of Manhattan in New York City, it is a major gateway to points in Europe…Newark Liberty International Airport is an international airport straddling the boundary between the cities of Newark in Essex County and Elizabeth in Union County, New Jersey, in the United States. Located about 4.5 miles south of downtown Newark and 9 miles west-southwest of Manhattan in New York City, it is a major gateway to points in Europe, South America, Asia, and Oceania. It is jointly owned by the cities and leased to its operator, the Port Authority of New York and New Jersey. It is the second-busiest airport in the New York airport system behind John F. Kennedy International Airport but far ahead of LaGuardia Airport.