11568 -- U.S. ZIP code Municipality (1990): OLD WESTBURY, New York All ZIPs for this municipality (1990): 11568 Population (2000): 3992 Housing Units (2000): 1032 Land area (2000): 7.970245 sq. miles (20.642839 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 7.970245 sq. miles (20.642839 sq. km) Located within: New York (NY) Location: 40.787368 N, 73.601196 W