| ID | Historical Marker | County |
|---|
| 03.2013.1 | Cerealine Manufacturing Co. | Bartholomew |
| 08.2018.1 | Claude R. Wickard | Carroll |
| 08.2020.1 | Fouts Soyland Farm / American Soybean Association | Carroll |
| 10.1995.1 | Borden Institute Site | Clark |
| 14.1989.2 | Robert C. Graham | Daviess |
| 17.2022.1 | Sechler's Pickles | DeKalb |
| 18.1996.2 | Slickville Tile Works | Delaware |
| 20.1997.1 | A.E. Kunderd Gladiolus Farm | Elkhart |
| 32.2017.1 | Adrian A. Parsons, 1846-1929 / Indiana’s Soybean Pioneer | Hendricks |
| 35.1950.1 | Indian School* | Huntington |
| 45.1992.1 | Dutch in the Calumet Region | Lake |
| 46.2003.1 | The Rumely Companies | LaPorte |
| 49.1998.3 | German Greenhouses and Truck Gardens | Marion |
| 68.2005.1 | Farmland Downtown Historic District | Randolph |
| 72.2001.2 | John Kimberlin Farm | Scott |
| 78.1980.1 | Dr. Elwood Mead (1858-1936) | Switzerland |
| 78.2022.1 | Thiebaud Farmstead | Switzerland |
| 82.1976.1 | First SWCD in Indiana | Vanderburgh |
| 89.2014.1 | Virginia Claypool Meredith | Wayne |
