Queens is the easternmost and largest in area of the five boroughs of New York City, geographically adjacent to the borough of Brooklyn at the western end of Long Island. Coterminous with Queens County since 1899, the borough of Queens is the second-largest in population (behind Brooklyn), with a census-estimated 2,321,580 residents in 2014, approximately 48% of them foreign-born. Queens County is also the second-most populous county in New York, behind the neighboring borough of Brooklyn, which is coterminous with Kings County. Queens is the fourth-most densely populated county among New York City's boroughs, as well as in the United States. If each New York City borough were an independent city, Queens would also be the nation's fourth most populous city, after Los Angeles, Chicago and Brooklyn. Queens is the most ethnically diverse urban area in the world.
The differing character in the neighborhoods of Queens is reflected by its diverse housing stock ranging from high-rise apartment buildings, especially prominent in the more densely urban areas of western and central Queens, such as Jackson Heights, Flushing, Astoria, and Long Island City, to large, free-standing single-family homes, common in the eastern part of the borough, in neighborhoods that have a more suburban layout like neighboring Nassau County, such as Little Neck, Douglaston, and Bayside.
Queens has the second-largest and most diversified economy of all the five boroughs of New York City; the borough is home to two of the three busiest New York City metropolitan area airports (and both major airports in New York City proper), JFK International Airport and LaGuardia Airport. These airports are among the busiest in the world, causing the airspace above Queens to be the most congested in the country. Attractions in Queens include Flushing Meadows Park—home to the New York Mets baseball team and the US Open tennis tournament—Kaufman Astoria Studios, Silvercup Studios, and Aqueduct Racetrack.
Queens was established in 1683, as one of the original 12 counties of New York and was named for the Portuguese Princess Catherine of Braganza (1638–1705), who was at the time queen of England, Scotland, and Ireland. Queens became a borough of New York City in 1898. From 1683 until 1899, the County of Queens included what is now Nassau County.