14787 -- U.S. ZIP code Municipality (1990): WESTFIELD, New York All ZIPs for this municipality (1990): 14787 Population (2000): 5487 Housing Units (2000): 2636 Land area (2000): 40.117207 sq. miles (103.903086 sq. km) Water area (2000): 0.031826 sq. miles (0.082428 sq. km) Total area (2000): 40.149033 sq. miles (103.985514 sq. km) Located within: New York (NY) Location: 42.327029 N, 79.573011 W