60091 -- U.S. ZIP code Municipality (1990): WILMETTE, Illinois All ZIPs for this municipality (1990): 60091 Population (2000): 27386 Housing Units (2000): 10144 Land area (2000): 5.283927 sq. miles (13.685308 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 5.283927 sq. miles (13.685308 sq. km) Located within: Illinois (IL) Location: 42.077178 N, 87.723736 W