The Bronx is New York City's northernmost borough, coterminous with Bronx County. The Bronx is locate 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, which ranks fourth of the five boroughs. Recently, its population, which had been declining since it peaked in 1950, showed a small increase.