New Haven is a coastal city in the U.S. state of Connecticut. It is located on New Haven Harbor on the northern shore of Long Island Sound in New Haven County, Connecticut, and is part of the New York metropolitan area. With a population of 129,779 as determined by the 2010 United States Census, it is the second-largest city in Connecticut after Bridgeport. New Haven is the principal municipality of Greater New Haven, which had a total population of 862,477 in 2010. New Haven was the first planned city in America. Founded in 1638 by English Puritans, a year later eight streets were laid out in a four-by-four grid, creating what is commonly known as the "Nine Square Plan". New Haven is the home of Yale University. As New Haven's biggest taxpayer and employer, Yale serves as an integral part of the city's economy. Health care (hospitals and biotechnology), professional services (legal, architectural, marketing, and engineering), financial services, and retail trade also contribute to the city's economic activity.