64438 -- U.S. ZIP code Municipality (1990): DARLINGTON, Missouri All ZIPs for this municipality (1990): 64438 Population (2000): 283 Housing Units (2000): 112 Land area (2000): 31.458025 sq. miles (81.475907 sq. km) Water area (2000): 0.006214 sq. miles (0.016094 sq. km) Total area (2000): 31.464239 sq. miles (81.492001 sq. km) Located within: Missouri (MO) Location: 40.183995 N, 94.401639 W