62543 -- U.S. ZIP code Municipality (1990): LATHAM, Illinois All ZIPs for this municipality (1990): 62543 Population (2000): 545 Housing Units (2000): 242 Land area (2000): 22.135426 sq. miles (57.330487 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 22.135426 sq. miles (57.330487 sq. km) Located within: Illinois (IL) Location: 39.965691 N, 89.159369 W