62450 -- U.S. ZIP code Municipality (1990): OLNEY, Illinois All ZIPs for this municipality (1990): 62450 Population (2000): 11900 Housing Units (2000): 5704 Land area (2000): 154.552717 sq. miles (400.289683 sq. km) Water area (2000): 1.782011 sq. miles (4.615388 sq. km) Total area (2000): 156.334728 sq. miles (404.905071 sq. km) Located within: Illinois (IL) Location: 38.724560 N, 88.086589 W