10549 -- U.S. ZIP code Municipality (1990): MOUNT KISCO, New York All ZIPs for this municipality (1990): 10549 Population (2000): 15327 Housing Units (2000): 5940 Land area (2000): 18.282150 sq. miles (47.350549 sq. km) Water area (2000): 0.058816 sq. miles (0.152334 sq. km) Total area (2000): 18.340966 sq. miles (47.502883 sq. km) Located within: New York (NY) Location: 41.204027 N, 73.730458 W