States Bordering Illinois: Indiana, Kentucky, Missouri, Iowa, Wisconsin

Illinois shares land or water borders with five states:

1. Indiana — East (Wabash River forms part).
2. Kentucky — Southeast (Ohio River).
3. Missouri — West (Mississippi River).
4. Iowa — Northwest (Mississippi River).
5. Wisconsin — North (land border).

Water Boundaries

• Lake Michigan — Northeast (maritime border with Michigan, but no land border).
• Ohio River (south) and Mississippi River (west) are legal boundaries to the low-water mark on the opposite shore.

No Border With

Michigan (lake only), Minnesota, Tennessee, Arkansas.