11731 -- U.S. ZIP code Municipality (1990): ELWOOD, New York All ZIPs for this municipality (1990): 11731 Population (2000): 31250 Housing Units (2000): 10484 Land area (2000): 8.899096 sq. miles (23.048551 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 8.899096 sq. miles (23.048551 sq. km) Located within: New York (NY) Location: 40.865998 N, 73.317960 W