13780 -- U.S. ZIP code Municipality (1990): GUILFORD, New York All ZIPs for this municipality (1990): 13780 Population (2000): 923 Housing Units (2000): 488 Land area (2000): 17.858925 sq. miles (46.254401 sq. km) Water area (2000): 0.214397 sq. miles (0.555286 sq. km) Total area (2000): 18.073322 sq. miles (46.809687 sq. km) Located within: New York (NY) Location: 42.426583 N, 75.481192 W