62002 -- U.S. ZIP code Municipality (1990): ALTON, Illinois All ZIPs for this municipality (1990): 62002 Population (2000): 34062 Housing Units (2000): 15472 Land area (2000): 40.523070 sq. miles (104.954264 sq. km) Water area (2000): 0.783750 sq. miles (2.029903 sq. km) Total area (2000): 41.306820 sq. miles (106.984167 sq. km) Located within: Illinois (IL) Location: 38.906065 N, 90.159096 W