62970 -- U.S. ZIP code Municipality (1990): OLMSTED, Illinois All ZIPs for this municipality (1990): 62970 Population (2000): 675 Housing Units (2000): 351 Land area (2000): 30.918575 sq. miles (80.078738 sq. km) Water area (2000): 0.008787 sq. miles (0.022758 sq. km) Total area (2000): 30.927362 sq. miles (80.101496 sq. km) Located within: Illinois (IL) Location: 37.199769 N, 89.109641 W