| COUNTY | ECOREGION |
| Adams | Bluffton Till Plain |
| Allen | Bluffton Till Plain |
| Bartholomew | Bluegrass |
| Benton | Grand Prairie |
| Blackford | Bluffton Till Plain |
| Boone | Tipton Till Plain |
| Brown | Highland Rim and Shawnee Hills |
| Carroll | Tipton Till Plain |
| Cass | Tipton Till Plain |
| Clark | Bluegrass |
| Clay | Southern Bottomlands & Southwestern Lowlands |
| Clinton | Tipton Till Plain |
| Crawford | Highland Rim and Shawnee Hills |
| Daviess | Southern Bottomlands & Southwestern Lowlands |
| Dearborn | Bluegrass |
| Decatur | Bluegrass |
| DeKalb | Bluffton Till Plain |
| Delaware | Bluffton Till Plain |
| Dubois | Highland Rim and Shawnee Hills |
| Elkhart | Northern Lakes |
| Fayette | Bluegrass |
| Floyd | Bluegrass |
| Fountain | Entrenched Valley |
| Franklin | Bluegrass |
| Fulton | Northern Lakes |
| Gibson | Southern Bottomlands & Southwestern Lowlands |
| Grant | Bluffton Till Plain |
| Greene | Highland Rim and Shawnee Hills |
| Hamilton | Tipton Till Plain |
| Hancock | Tipton Till Plain |
| Harrison | Highland Rim and Shawnee Hills |
| Hendricks | Tipton Till Plain |
| Henry | Tipton Till Plain |
| Howard | Tipton Till Plain |
| Huntington | Bluffton Till Plain |
| Jackson | Bluegrass |
| Jasper | Grand Prairie |
| Jay | Bluffton Till Plain |
| Jefferson | Bluegrass |
| Jennings | Bluegrass |
| Johnson | Tipton Till Plain |
| Knox | Southern Bottomlands & Southwestern Lowlands |
| Kosciusko | Northern Lakes |
| La Porte | NW Morainal |
| LaGrange | Northern Lakes |
| Lake | NW Morainal |
| Lawrence | Highland Rim and Shawnee Hills |
| Madison | Tipton Till Plain |
| Marion | Tipton Till Plain |
| Marshall | Northern Lakes |
| Martin | Highland Rim and Shawnee Hills |
| Miami | Bluffton Till Plain |
| Monroe | Highland Rim and Shawnee Hills |
| Montgomery | Entrenched Valley |
| Morgan | Highland Rim and Shawnee Hills |
| Newton | Grand Prairie |
| Noble | Northern Lakes |
| Ohio | Bluegrass |
| Orange | Highland Rim and Shawnee Hills |
| Owen | Highland Rim and Shawnee Hills |
| Parke | Entrenched Valley |
| Perry | Highland Rim and Shawnee Hills |
| Pike | Southern Bottomlands & Southwestern Lowlands |
| Porter | NW Morainal |
| Posey | Southern Bottomlands & Southwestern Lowlands |
| Pulaski | Grand Prairie |
| Putnam | Entrenched Valley |
| Randolph | Tipton Till Plain |
| Ripley | Bluegrass |
| Rush | Tipton Till Plain |
| Scott | Bluegrass |
| Shelby | Tipton Till Plain |
| Spencer | Southern Bottomlands & Southwestern Lowlands |
| St. Joseph | Northern Lakes |
| Starke | Grand Prairie |
| Steuben | Northern Lakes |
| Sullivan | Southern Bottomlands & Southwestern Lowlands |
| Switzerland | Bluegrass |
| Tippecanoe | Entrenched Valley |
| Tipton | Tipton Till Plain |
| Union | Bluegrass |
| Vanderburgh | Southern Bottomlands & Southwestern Lowlands |
| Vermillion | Entrenched Valley |
| Vigo | Southern Bottomlands & Southwestern Lowlands |
| Wabash | Bluffton Till Plain |
| Warren | Grand Prairie |
| Warrick | Southern Bottomlands & Southwestern Lowlands |
| Washington | Highland Rim and Shawnee Hills |
| Wayne | Tipton Till Plain |
| Wells | Bluffton Till Plain |
| White | Grand Prairie |
| Whitley | Northern Lakes |
Indiana counties and their ecoregions
Download a copy of the county/ecoregion list (PDF).