64496 -- U.S. ZIP code Municipality (1990): WATSON, Missouri All ZIPs for this municipality (1990): 64496 Population (2000): 186 Housing Units (2000): 95 Land area (2000): 31.656646 sq. miles (81.990333 sq. km) Water area (2000): 0.526115 sq. miles (1.362632 sq. km) Total area (2000): 32.182761 sq. miles (83.352965 sq. km) Located within: Missouri (MO) Location: 40.497797 N, 95.631214 W