11553 -- U.S. ZIP code Municipality (1990): UNIONDALE, New York All ZIPs for this municipality (1990): 11553 Population (2000): 23452 Housing Units (2000): 6321 Land area (2000): 2.782885 sq. miles (7.207640 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 2.782885 sq. miles (7.207640 sq. km) Located within: New York (NY) Location: 40.703502 N, 73.593068 W