61046 -- U.S. ZIP code Municipality (1990): LANARK, Illinois All ZIPs for this municipality (1990): 61046 Population (2000): 2920 Housing Units (2000): 1656 Land area (2000): 88.868402 sq. miles (230.168094 sq. km) Water area (2000): 0.642025 sq. miles (1.662837 sq. km) Total area (2000): 89.510427 sq. miles (231.830931 sq. km) Located within: Illinois (IL) Location: 42.111421 N, 89.824365 W