Closter (pronounced KLO-ster, with a long o) is a Borough in Bergen County, New Jersey, United States. As of the 2010 United States Census, the borough population was 8,373. After the turn of the century, Closter changed from being sprawling estates and farms into a middle and upper middle class suburban town.
Closter, settled in 1704, was formed by an Act of the New Jersey Legislature on January 1, 1904, from portions of Harrington Township. On March 29, 1904, Harrington Park was created from portions of Closter, Harrington Township and Washington Township.
Closter is located at 40°58′19″N 73°57′52″W / 40.971896°N 73.964368°W / 40.971896; -73.964368.