Admitted to the Union on December 11, 1816 as the 19th state. Indiana became a territory in July 1800.
- 1800 – 1810 federal censuses lost for all counties.
- 1820 federal census extant for all counties except Daviess.
- 1830—1940 federal censuses extant for all counties except for 1890.
| Adams | Allen | Bartholomew | Benton |
| Blackford | Boone | Brown | Carroll |
| Cass | Clark | Clay | Clinton |
| Crawford | Daviess | Dearborn | Decatur |
| De Kalb | Delaware | Dubois | Elkhart |
| Fayette | Floyd | Fountain | Franklin |
| Fulton | Gibson | Grant | Greene |
| Hamilton | Hancock | Harrison | Hendricks |
| Henry | Howard | Huntington | Jackson |
| Jasper | Jay | Jefferson | Jennings |
| Johnson | Knox | Kosciusko | La Porte |
| Lagrange | Lake | Lawrence | Madison |
| Marion | Marshall | Martin | Miami |
| Monroe | Montgomery | Morgan | Newton |
| Noble | Ohio | Orange | Owen |
| Parke | Perry | Pike | Porter |
| Posey | Pulaski | Putnam | Randolph |
| Ripley | Rush | St. Joseph | Scott |
| Shelby | Spencer | Starke | Steuben |
| Sullivan | Switzerland | Tippecanoe | Tipton |
| Union | Vanderburgh | Vermillion | Vigo |
| Wabash | Warren | Warrick | Washington |
| Wayne | Wells | White | Whitley |