Manhattan is one of the five boroughs of New York City.  It is geographically the smallest of the five.  There are a total of 72,000 people per every square mile, which is the highest in population density.  Manhattan is a very diverse place with many different neighborhoods which could be considered cities themselves.  Harlem is one of the largest neighborhoods in Manhattan, and is further broken down into sub-neighborhoods listed below.  Click each one to learn more.