62410 -- U.S. ZIP code Municipality (1990): ALLENDALE, Illinois All ZIPs for this municipality (1990): 62410 Population (2000): 1094 Housing Units (2000): 457 Land area (2000): 41.847714 sq. miles (108.385077 sq. km) Water area (2000): 0.009989 sq. miles (0.025872 sq. km) Total area (2000): 41.857703 sq. miles (108.410949 sq. km) Located within: Illinois (IL) Location: 38.528202 N, 87.729137 W