The Bronx is New York City's northernmost borough, coterminous with Bronx County. The Bronx is located northeast of Manhattan. It is the only one of the city's five boroughs situated primarily on the United States mainland (the others are on islands). As of 2006, the United States Census Bureau estimated that the borough's population was 1,361,473,Bronx County, New York, United States Census Bureau, accessed November 27, 2007 fourth of the five boroughs. Recently, its population, which had been declining since it peaked in 1950,Population of the 100 Largest Cities and Other Urban Places in The United States: 1790 to 1990. showed a small increase.