12817 -- U.S. ZIP code Municipality (1990): CHESTERTOWN, New York All ZIPs for this municipality (1990): 12817 Population (2000): 2187 Housing Units (2000): 1902 Land area (2000): 55.039555 sq. miles (142.551787 sq. km) Water area (2000): 2.013261 sq. miles (5.214321 sq. km) Total area (2000): 57.052816 sq. miles (147.766108 sq. km) Located within: New York (NY) Location: 43.638919 N, 73.817823 W