62284 -- U.S. ZIP code Municipality (1990): SMITHBORO, Illinois All ZIPs for this municipality (1990): 62284 Population (2000): 622 Housing Units (2000): 244 Land area (2000): 25.239649 sq. miles (65.370387 sq. km) Water area (2000): 0.038528 sq. miles (0.099788 sq. km) Total area (2000): 25.278177 sq. miles (65.470175 sq. km) Located within: Illinois (IL) Location: 38.887748 N, 89.322480 W