11740 -- U.S. ZIP code Municipality (1990): GREENLAWN, New York All ZIPs for this municipality (1990): 11740 Population (2000): 9647 Housing Units (2000): 3518 Land area (2000): 3.806387 sq. miles (9.858496 sq. km) Water area (2000): 0.003795 sq. miles (0.009829 sq. km) Total area (2000): 3.810182 sq. miles (9.868325 sq. km) Located within: New York (NY) Location: 40.862565 N, 73.362219 W