62401 -- U.S. ZIP code Municipality (1990): EFFINGHAM, Illinois All ZIPs for this municipality (1990): 62401 Population (2000): 19070 Housing Units (2000): 8255 Land area (2000): 107.992265 sq. miles (279.698671 sq. km) Water area (2000): 0.897796 sq. miles (2.325281 sq. km) Total area (2000): 108.890061 sq. miles (282.023952 sq. km) Located within: Illinois (IL) Location: 39.123807 N, 88.560005 W