Co-op City (short for Cooperative City) is a cooperative housing development located in the northeast section of the borough of the Bronx in New York City. It is bounded by Interstate 95 to the southwest, west, and north and the Hutchinson River Parkway to the east and southeast, and is partially in the Baychester and Eastchester neighborhoods. With 43,752 residents as of the 2010 United States Census,^[2] it is the largest housing cooperative in the world.^[3] It is in New York City Council District 12.

Co-op City was formerly marshland before being occupied by an amusement park called Freedomland U.S.A. from 1960 to 1964. Construction began in 1966 and the first residents moved in two years later, though the project was not completed until 1973. The construction of the community was sponsored by the United Housing Foundation and financed with a mortgage loan from New York State Housing Finance Agency.