| 54a Illinois/Indiana Prairies |
| 54b Chicago Lake Plain |
| 54c Kankakee Marsh |
| 54d Sand Area |
| 54f Valparaiso-Wheaton Morainal Complex |
| 55a Clayey High Lime Till Plains |
| 55b Loamy High Lime Till Plains |
| 55d Pre-Wisconsinan Drift Plains |
| 55f Whitewater Interlobate Area |
| 56a Northern Indiana Lake Country |
| 56b Battle Creek/Elkhart Outwash Plain |
| 56c Middle Tippecanoe Plains |
| 56d Michigan Lake Plain |
| 57a Maumee Lake Plain |
| 71a Crawford-Mammoth Cave Uplands |
| 71b Mitchell Plain |
| 71c Knobs-Norman Upland |
| 71d Outer Bluegrass |
| 72a Wabash-Ohio Bottomlands |
| 72b Glaciated Wabash Lowlands |
| 72c Green River-Southern Wabash Lowlands |
| 72h Caseyville Hills |
| 72m Wabash River Bluffs and Low Hills |
| Bluffton-Ann Arbor Till Plains |
| Brown County Hills |
| Crawford Escarpment |
| Crawford Uplands |
| Eastern Grand Prairie |
| Entrenched Valleys |
| Kalamazoo-Elkhart Moraines and Plains |
| Kankakee Marsh |
| Kankakee Sands |
| Knobstone Escarpment |
| Lake Michigan and Islands |
| Lower Ohio-Cache-Wabash Alluvial plains |
| Lower Wabash Alluvial Plain |
| Maumee Lake Plain |
| Miami-Scioto Plain-Tipton Till Plain |
| Mitchell Karst Plains |
| Muscatatuck Flats and Valleys |
| Northern Bluegrass |
| Northern Dripping Springs |
| Outer Western Coalfields |
| Scottsburg Lowland |
| Southeast Lake Michigan Moraines |
| Southeast Lake Michigan Plains and Dunes |
| Southern Grand Prairie |
| Southwest Indiana Glaciated Lowlands |
| Steuben Interlobate Moraines |
| Valparaiso Moraine |
| Wabash Uplands |
| Western Bluegrass |
| Western Knobs |