Johnsburg, IL -- U.S. village in Illinois Population (2000): 5391 Housing Units (2000): 1875 Land area (2000): 5.536743 sq. miles (14.340098 sq. km) Water area (2000): 0.575687 sq. miles (1.491022 sq. km) Total area (2000): 6.112430 sq. miles (15.831120 sq. km) FIPS code: 38479 Located within: Illinois (IL), FIPS 17 Location: 42.385796 N, 88.235942 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Johnsburg, IL Johnsburg