12589 -- U.S. ZIP code Municipality (1990): WALLKILL, New York All ZIPs for this municipality (1990): 12589 Population (2000): 13261 Housing Units (2000): 4438 Land area (2000): 52.905835 sq. miles (137.025477 sq. km) Water area (2000): 0.080683 sq. miles (0.208967 sq. km) Total area (2000): 52.986518 sq. miles (137.234444 sq. km) Located within: New York (NY) Location: 41.615036 N, 74.154618 W