| ID | Historical Marker | County |
|---|
| 02.1992.1 | Home of Philo T. Farnsworth | Allen |
| 06.1985.1 | The Boone County REMC | Boone |
| 06.1985.2 | The Boone County REMC | Boone |
| 10.1962.1 | Civil War Hospital 1864-66 | Clark |
| 10.1992.1 | Clark State Forest | Clark |
| 10.2017.2 | Sterilization & Eugenics | Clark |
| 17.2023.1 | Jane L. (Brooks) Hine | DeKalb |
| 20.2007.2 | Dr. Franklin L. Miles | Elkhart |
| 22.2011.1 | Lucy Higgs Nichols | Floyd |
| 24.2017.1 | Passenger Pigeon Extinction | Franklin |
| 26.2019.1 | Melba Newell Phillips | Gibson |
| 27.1995.1 | J.W. Patterson House | Grant |
| 27.2011.1 | Marion Branch, NHDVS | Grant |
| 29.2019.1 | Ryan White (1971-1990) | Hamilton |
| 29.2022.1 | Grave Robbing Scandal | Hamilton |
| 33.1966.1 | Birthplace of Wilbur Wright | Henry |
| 34.1966.1 | Haynes' Horseless Carriage | Howard |
| 35.1949.1 | Pioneer Medical Doctors / Chase S. Osborn | Huntington |
| 35.2018.1 | Dr. Otto U. King | Huntington |
| 35.2021.1 | Elizebeth Smith Friedman, 1892-1980 | Huntington |
| 39.1981.1 | Harvey Washington Wiley, M.D. 1844-1930 | Jefferson |
| 43.1995.1 | Lawrence D. Bell | Kosciusko |
| 45.1949.1 | First Physician | Lake |
| 46.2003.1 | The Rumely Companies | La Porte |
| 46.2018.1 | La Porte University / Indiana Medical College | La Porte |
| 47.1967.1 | Astronaut Virgil I. Grissom April 3, 1926 - January 7, 1967 | Lawrence |
| 47.2005.1 | Dunn Memorial Hospital | Lawrence |
| 49.1968.1 | Milestones in Nursing | Marion |
| 49.1975.2 | Indianapolis Motor Speedway | Marion |
| 49.2007.1 | 1907 Indiana Eugenics Law | Marion |
| 49.2007.3 | St. Vincent's Infirmary | Marion |
| 49.2013.1 | St. Vincent's Hospital | Marion |
| 49.2015.1 | Allison Machine Shop | Marion |
| 49.2016.3 | Central State Hospital | Marion |
| 49.2018.2 | WWI Aviation Repair Depot | Marion |
| 49.2018.3 | Lincoln Hospital, 1909-ca. 1915 | Marion |
| 49.2019.3 | Lt. Col. Joseph H. Ward, M.D., 1872-1952 | Marion |
| 49.2019.4 | Pathological Department / Old Pathology Building | Marion |
| 49.2021.4 | Leedy Manufacturing Company | Marion |
| 49.2022.1 | Dr. Amelia Keller, 1871-1943 | Marion |
| 49.2022.4 | Hook's Drug Stores | Marion |
| 54.2020.1 | Dr. Mary Holloway Wilhite, 1831-1892 | Montgomery |
| 62.1961.1 | Abraham S. Fulton | Perry |
| 69.2016.1 | Bilby Steel Tower | Ripley |
| 71.1965.1 | Sisters of the Holy Cross Civil War Nurses 1861-1865 | St. Joseph |
| 77.1972.1 | Grave of Jane Todd Crawford | Sullivan |
| 78.1966.1 | Birthplace John Shaw Billings, M.D. April 12, 1838 - March 11, 1913 | Switzerland |
| 78.1980.1 | Dr. Elwood Mead (1858-1936) | Switzerland |
| 78.2018.1 | Dr. John Shaw Billings | Switzerland |
| 81.1963.1 | Maj. Gen. Ambrose E. Burnside 1824-1881 | Union |
| 82.2018.1 | Glenn A. Black (1900-1964) | Vanderburgh |
| 84.1992.2 | Union Hospital | Vigo |
| 85.1966.1 | First Electrically Lighted City | Wabash |
| 89.2023.1 | Dr. Mary F. Thomas, 1816-1888 | Wayne |
| 90.2001.1 | Charles C. Deam | Wells |
