11742 -- U.S. ZIP code Municipality (1990): HOLTSVILLE, New York All ZIPs for this municipality (1990): 11742 Population (2000): 12119 Housing Units (2000): 4205 Land area (2000): 5.020905 sq. miles (13.004084 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 5.020905 sq. miles (13.004084 sq. km) Located within: New York (NY) Location: 40.810606 N, 73.040366 W