62346 -- U.S. ZIP code Municipality (1990): LA PRAIRIE, Illinois All ZIPs for this municipality (1990): 62346 Population (2000): 254 Housing Units (2000): 112 Land area (2000): 34.332225 sq. miles (88.920051 sq. km) Water area (2000): 0.022548 sq. miles (0.058399 sq. km) Total area (2000): 34.354773 sq. miles (88.978450 sq. km) Located within: Illinois (IL) Location: 40.151799 N, 90.954260 W