61085 -- U.S. ZIP code Municipality (1990): STOCKTON, Illinois All ZIPs for this municipality (1990): 61085 Population (2000): 3587 Housing Units (2000): 1628 Land area (2000): 126.265769 sq. miles (327.026826 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 126.265769 sq. miles (327.026826 sq. km) Located within: Illinois (IL) Location: 42.350108 N, 90.023629 W