13864 -- U.S. ZIP code Municipality (1990): WILLSEYVILLE, New York All ZIPs for this municipality (1990): 13864 Population (2000): 1085 Housing Units (2000): 495 Land area (2000): 23.513540 sq. miles (60.899786 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 23.513540 sq. miles (60.899786 sq. km) Located within: New York (NY) Location: 42.298203 N, 76.388444 W