Illinois vs. Indiana: Which State Is Smaller?

Indiana is the smaller state. Here's the breakdown by total area:

• Illinois: 57,914 square miles (149,998 km²)
• Indiana: 36,418 square miles (94,321 km²)

Illinois is roughly 1.6 times larger than Indiana. The difference comes largely from Illinois's greater east-west extent and its inclusion of a significant portion of Lake Michigan's shoreline.

Quick Comparison

Both states share a border and similar Midwestern geography, but Illinois's larger footprint gives it more diverse landscapes, from the Driftless Area in the northwest to the Shawnee Hills in the south.