| ID | Historical Marker | County |
|---|
| 08.1963.1 | Sycamore Row | Carroll |
| 10.1992.1 | Clark State Forest | Clark |
| 10.1998.1 | Fern Grove and Rose Island Resorts | Clark |
| 13.1992.2 | Early Mining At Wyandotte Caves | Crawford |
| 17.2023.1 | Jane L. (Brooks) Hine | DeKalb |
| 18.1981.1 | First Indiana Gas Well | Delaware |
| 19.1949.1 | Buffalo Trace Vincennes to Clarksville | Dubois |
| 20.1997.1 | A.E. Kunderd Gladiolus Farm | Elkhart |
| 20.2001.1 | Krider Nurseries World's Fair Garden | Elkhart |
| 22.1999.1 | Buffalo Trace Route | Floyd |
| 22.2007.1 | New Albany Tornado, 1917 | Floyd |
| 23.1997.1 | Attica & Covington Canal Skirmish | Fountain |
| 23.2003.1 | Ravine Park | Fountain |
| 24.2017.1 | Passenger Pigeon Extinction | Franklin |
| 26.2024.2 | Tri-State Tornado, March 18, 1925 | Gibson |
| 29.2007.1 | Potter's Covered Bridge | Hamilton |
| 31.1992.1 | Cedar Glade | Harrison |
| 40.1999.1 | Muscatatuck Park | Jennings |
| 40.2001.1 | Muscatatuck Park | Jennings |
| 40.2004.1 | Muscatatuck Park | Jennings |
| 40.2020.1 | Muscatatuck Park | Jennings |
| 43.1966.1 | Indiana's Glacier Lakes | Kosciusko |
| 43.1968.1 | Continental Divide | Kosciusko |
| 47.1966.1 | Indiana (Oolitic) Limestone Quarries | Lawrence |
| 49.1998.3 | German Greenhouses and Truck Gardens | Marion |
| 49.1999.1 | Indianapolis Fire Department / Bowen-Merrill Fire | Marion |
| 49.2004.2 | John Muir in Indianapolis | Marion |
| 53.1996.1 | Stinesville Limestone Industry | Monroe |
| 55.1966.1 | Wisconsin Glacial Boundary | Morgan |
| 57.1992.1 | Sylvan Lake | Noble |
| 57.2013.1 | Gene Stratton-Porter | Noble |
| 60.2008.1 | Cataract Falls Covered Bridge | Owen |
| 61.1968.4 | Turkey Run | Parke |
| 61.2012.1 | Juliet V. Strauss | Parke |
| 63.1966.1 | The Buffalo Trace | Pike |
| 64.2009.1 | Edwin Way Teale | Porter |
| 64.2018.1 | Legacy of Steel / Burns Harbor Steel Plant | Porter |
| 65.2004.1 | Tri-State Tornado | Posey |
| 65.2006.1 | Griffin Oil Discovery | Posey |
| 66.1988.1 | First Indiana Natural Gas Well | Pulaski |
| 71.1997.2 | Battell Park | St. Joseph |
| 78.1980.1 | Dr. Elwood Mead (1858-1936) | Switzerland |
| 82.1976.1 | First SWCD in Indiana | Vanderburgh |
| 82.2003.1 | Ohio River Levee | Vanderburgh |
| 83.2018.1 | Henry Dana Washburn, 1832-1871 | Vermillion |
| 88.1995.1 | Illinoian Glacier Boundary | Washington |
| 90.2001.1 | Charles C. Deam | Wells |
