10918 -- U.S. ZIP code Municipality (1990): CHESTER, New York All ZIPs for this municipality (1990): 10918 Population (2000): 11492 Housing Units (2000): 3869 Land area (2000): 33.649417 sq. miles (87.151586 sq. km) Water area (2000): 0.164976 sq. miles (0.427285 sq. km) Total area (2000): 33.814393 sq. miles (87.578871 sq. km) Located within: New York (NY) Location: 41.356480 N, 74.260726 W