64601 -- U.S. ZIP code Municipality (1990): CHILLICOTHE, Missouri All ZIPs for this municipality (1990): 64601 Population (2000): 11762 Housing Units (2000): 5191 Land area (2000): 251.064247 sq. miles (650.253387 sq. km) Water area (2000): 0.966001 sq. miles (2.501930 sq. km) Total area (2000): 252.030248 sq. miles (652.755317 sq. km) Located within: Missouri (MO) Location: 39.790132 N, 93.548038 W