61720 -- U.S. ZIP code Municipality (1990): ANCHOR, Illinois All ZIPs for this municipality (1990): 61720 Population (2000): 366 Housing Units (2000): 128 Land area (2000): 29.890348 sq. miles (77.415642 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 29.890348 sq. miles (77.415642 sq. km) Located within: Illinois (IL) Location: 40.553838 N, 88.510106 W