States Bordering Illinois: Complete Guide

Illinois, a Midwestern state, shares borders with five states and one water boundary:

• North: Wisconsin (land boundary)
• Northeast: Michigan (water boundary across Lake Michigan)
• East: Indiana (land boundary, partly Wabash River)
• South: Kentucky (Ohio River boundary)
• Southwest: Missouri (Mississippi River boundary)
• West: Iowa (Mississippi River boundary)

Geographic Notes

• Only the Wisconsin border is entirely terrestrial.
• Three major rivers form boundaries: Mississippi (west/southwest), Ohio (south), Wabash (southeast).
• Lake Michigan forms the northeastern boundary—Illinois has 63 miles of shoreline.
• The tri-state area (IL-IN-WI) near Chicago is a major economic zone.
• Cairo, IL sits at the confluence of the Ohio and Mississippi—strategic historically.

Regional Context

Illinois serves as a transportation nexus linking the Great Lakes, Mississippi Basin, and Eastern Seaboard—reflected in its border geography.