From its statehood in 1816 until 1823, Indiana was allocated only one representative, who was elected at-large. During the 43rd Congress, from 1873 to 1875, Indiana elected three of its thirteen representatives to the United States House of Representatives at-large from the entire state.
List of representatives
December 11, 1816: Indiana admitted to the Union
References
Indiana's at-large congressional district Wikipedia(Text) CC BY-SA