61459 -- U.S. ZIP code Municipality (1990): MARIETTA, Illinois All ZIPs for this municipality (1990): 61459 Population (2000): 424 Housing Units (2000): 202 Land area (2000): 34.126286 sq. miles (88.386672 sq. km) Water area (2000): 0.155055 sq. miles (0.401590 sq. km) Total area (2000): 34.281341 sq. miles (88.788262 sq. km) Located within: Illinois (IL) Location: 40.503305 N, 90.418082 W