12056 -- U.S. ZIP code Municipality (1990): DUANESBURG, New York All ZIPs for this municipality (1990): 12056 Population (2000): 2219 Housing Units (2000): 911 Land area (2000): 19.222213 sq. miles (49.785300 sq. km) Water area (2000): 0.224159 sq. miles (0.580568 sq. km) Total area (2000): 19.446372 sq. miles (50.365868 sq. km) Located within: New York (NY) Location: 42.767853 N, 74.090832 W