Hazlet is a township in Monmouth County, New Jersey, United States. It is located in the New York Metropolitan Area and is a bedroom community of New York. As of the 2010 United States Census, the township's population was 20,334, reflecting a decline of 1,044 (-4.9%) from the 21,378 counted in the 2000 Census, which had in turn declined by 598 (-2.7%) from the 21,976 counted in the 1990 Census.
Hazlet is part of the Bayshore Regional Strategic Plan, an effort by nine municipalities in northern Monmouth County to reinvigorate the area's economy by emphasizing the traditional downtowns, dense residential neighborhoods, maritime history, and the natural environment of the Raritan Bayshore coastline.
What is now Hazlet Township was originally incorporated as Raritan Township by an act of the New Jersey Legislature on February 25, 1848, from portions of Middletown Township. Portions of the township were taken to form Holmdel Township (February 23, 1857), Matawan Township (also February 23, 1857, now Aberdeen Township), Keyport (March 17, 1870), Keansburg (March 26, 1917) and Union Beach (March 16, 1925). The township was renamed "Hazlet Township" as of November 28, 1967, based on the results of a referendum held on November 7, 1967. Hazlet derives its name from Dr. John Hazlett, who had an estate in Raritan Township near the Keyport-Holmdel Turnpike, now Holmdel Road.
Hazlet was the site of the last drive-in movie theater in New Jersey, the Route 35 Drive-In, which closed in 1991, until the Delsea Drive-In in Vineland reopened in 2004.
According to the United States Census Bureau, the township had a total area of 5.67 square miles (14.68 km2), including 5.57 square miles (14.42 km2) of land and 0.10 square miles (0.26 km2) of water (1.76%). Hazlet is roughly 37 miles (60 km) south of Manhattan and 56 miles (90 km) northeast of Philadelphia.
Unincorporated communities located partially or completely within Hazlet include Centerville, Mechanicsville, North Centerville, South Keyport, Tiltons Corner, Van Marters Corner and West Keansburg.
The township borders Aberdeen Township, Holmdel Township, Keansburg, Keyport, Middletown Township and Union Beach.
The 2010 United States Census counted 20,334 people, 7,140 households, and 5,526 families in the township.