62353 -- U.S. ZIP code Municipality (1990): MOUNT STERLING, Illinois All ZIPs for this municipality (1990): 62353 Population (2000): 5526 Housing Units (2000): 1781 Land area (2000): 194.840410 sq. miles (504.634325 sq. km) Water area (2000): 0.168105 sq. miles (0.435390 sq. km) Total area (2000): 195.008515 sq. miles (505.069715 sq. km) Located within: Illinois (IL) Location: 39.983824 N, 90.741346 W