11801 -- U.S. ZIP code Municipality (1990): HICKSVILLE, New York All ZIPs for this municipality (1990): 11801 Population (2000): 39449 Housing Units (2000): 13354 Land area (2000): 6.681570 sq. miles (17.305186 sq. km) Water area (2000): 0.005246 sq. miles (0.013588 sq. km) Total area (2000): 6.686816 sq. miles (17.318774 sq. km) Located within: New York (NY) Location: 40.763355 N, 73.523231 W