Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Illiana Racetrack | Locale | 205 | Lake | 41 28 37 N | 087 25 23 W |
| Illinoi | Populated Place | 191 | Lake | 41 11 23 N | 087 31 34 W |
| Imagination Glen Park | Park | 185 | Porter | 41 35 19 N | 087 08 24 W |
| Imbach Ditch | Canal | 224 | Allen | 41 08 41 N | 084 49 15 W |
| Immaculate Conception Roman Catholic Church | Church | 179 | Lake | 41 37 31 N | 087 28 46 W |
| Immaculate Conception School | School | 179 | Lake | 41 37 31 N | 087 28 47 W |
| Immaculate Heart of Mary Roman Catholic Church | Church | 220 | Marion | 39 51 24 N | 086 09 03 W |
| Immaculate Heart School | School | 220 | Marion | 39 51 24 N | 086 09 04 W |
| Immanuel Church | Church | 187 | Lake | 41 32 27 N | 087 28 31 W |
| Immanuel Church | Church | 220 | LaPorte | 41 29 02 N | 086 40 42 W |
| Immanuel Church | Church | 148 | Posey | 37 57 05 N | 087 45 17 W |
| Immanuel Church | Church | 247 | St. Joseph | 41 38 59 N | 086 16 03 W |
| Immanuel Church | Church | 149 | Vanderburgh | 38 08 38 N | 087 31 27 W |
| Immanuel Lutheran Church | Church | 247 | Porter | 41 29 04 N | 087 02 22 W |
| Immanuel Presbyterian Church | Church | 198 | Lake | 41 29 22 N | 087 27 19 W |
| Immanuel School | School | 254 | Adams | 40 52 13 N | 084 50 35 W |
| Immanuel School | School | 249 | Porter | 41 29 03 N | 087 02 17 W |
| Immanuel United Methodist Church | Church | 260 | Marion | 39 48 55 N | 086 03 43 W |
| Immanuel-Lutheran School | School | 183 | Jackson | 38 57 12 N | 085 53 20 W |
| Imperial Hills | Populated Place | 227 | Johnson | 39 37 54 N | 086 08 30 W |
| Inbody Church | Church | 278 | Elkhart | 41 33 06 N | 085 53 16 W |
| Independence | Populated Place | 168 | Warren | 40 20 15 N | 087 10 08 W |
| Independence Cemetery | Cemetery | 186 | Warren | 40 20 51 N | 087 10 39 W |
| Independence Church | Church | 272 | Blackford | 40 31 21 N | 085 25 38 W |
| Independence Church | Church | 217 | Jasper | 41 04 02 N | 086 56 59 W |
| Independence Hill | Populated Place | 206 | Lake | 41 28 34 N | 087 22 02 W |
| Independence Park | Park | 191 | Lake | 41 29 15 N | 087 22 29 W |
| Independent Baptist Church | Church | 246 | Marion | 39 46 40 N | 086 19 21 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 284 | Blackford | 40 22 56 N | 085 12 53 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 274 | Blackford | 40 26 55 N | 085 21 04 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 295 | Boone | 39 55 51 N | 086 37 14 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 206 | Carroll | 40 38 53 N | 086 34 07 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 240 | Fulton | 41 01 03 N | 086 24 22 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 257 | Fulton | 41 02 07 N | 086 02 29 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 236 | Fulton | 41 04 18 N | 086 13 28 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 223 | Fulton | 41 07 28 N | 086 23 18 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 246 | Grant | 40 32 22 N | 085 38 23 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 253 | Grant | 40 34 37 N | 085 50 54 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 254 | Kosciusko | 41 10 14 N | 086 02 01 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 259 | Madison | 40 13 08 N | 085 46 47 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 259 | Miami | 40 54 35 N | 086 06 41 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 231 | Montgomery | 40 01 55 N | 086 54 22 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 223 | Morgan | 39 32 07 N | 086 16 08 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 177 | Orange | 38 39 02 N | 086 33 13 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 149 | Pike | 38 27 17 N | 087 05 00 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 150 | Pike | 38 27 57 N | 087 26 54 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 217 | Pulaski | 40 58 11 N | 086 34 22 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 142 | Sullivan | 38 58 38 N | 087 25 20 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 231 | Wabash | 40 50 26 N | 085 43 39 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 229 | Wabash | 40 55 40 N | 085 55 27 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 347 | Wayne | 39 57 54 N | 084 55 16 W |
| Independent Order of Odd Fellows Cemetery | Cemetery | 207 | White | 40 36 17 N | 086 52 27 W |
| Indi-Illi Park | Park | 183 | Lake | 41 35 26 N | 087 31 26 W |
| India Branch | Stream | | Marion | 39 53 03 N | 085 58 01 W |
| Indian Branch | Stream | | Parke | 39 39 33 N | 087 03 32 W |
| Indian Camp Creek | Stream | | Madison | 40 05 15 N | 085 49 48 W |
| Indian Creek | Stream | | Dubois | 38 17 18 N | 086 54 20 W |
| Indian Creek | Stream | | Elkhart | 41 38 57 N | 085 51 15 W |
| Indian Creek | Stream | | Franklin | 39 24 03 N | 085 07 25 W |
| Indian Creek | Stream | | Gibson | 38 23 28 N | 087 32 24 W |
| Indian Creek | Stream | | Harrison | 38 07 00 N | 086 16 26 W |
| Indian Creek | Stream | | Jackson | 38 54 59 N | 086 00 55 W |
| Indian Creek | Stream | | Jennings | 38 57 14 N | 085 41 44 W |
| Indian Creek | Stream | | Knox | 38 44 05 N | 087 15 41 W |
| Indian Creek | Stream | | Knox | 38 42 38 N | 087 20 26 W |
| Indian Creek | Stream | | Madison | 40 09 56 N | 085 44 52 W |
| Indian Creek | Stream | | Marion | 39 53 07 N | 086 00 09 W |
| Indian Creek | Stream | | Monroe | 39 17 28 N | 086 35 35 W |
| Indian Creek | Stream | | Monroe | 38 43 36 N | 086 45 44 W |
| Indian Creek | Stream | | Montgomery | 39 56 41 N | 087 03 12 W |
| Indian Creek | Stream | | Morgan | 39 23 55 N | 086 26 57 W |
| Indian Creek | Stream | | Owen | 39 21 08 N | 086 39 30 W |
| Indian Creek | Stream | | Pike | 38 25 27 N | 087 29 10 W |
| Indian Creek | Stream | | Posey | 37 59 57 N | 087 56 50 W |
| Indian Creek | Stream | | Switzerland | 38 43 36 N | 085 06 06 W |
| Indian Creek | Stream | | Tippecanoe | 40 24 50 N | 087 02 04 W |
| Indian Creek | Stream | | Wabash | 40 47 49 N | 085 39 52 W |
| Indian Creek | Stream | | White | 40 55 32 N | 086 41 49 W |
| Indian Creek Camp | Park | 186 | Lawrence | 38 53 46 N | 086 33 34 W |
| Indian Creek Cemetery | Cemetery | 251 | Montgomery | 39 55 27 N | 086 55 39 W |
| Indian Creek Cemetery | Cemetery | 207 | Pulaski | 40 55 17 N | 086 39 59 W |
| Indian Creek Church | Church | 233 | Cass | 40 52 50 N | 086 26 32 W |
| Indian Creek Church | Church | 205 | Floyd | 38 19 23 N | 086 00 41 W |
| Indian Creek Church | Church | 158 | Lawrence | 38 50 00 N | 086 40 17 W |
| Indian Creek Estates | Populated Place | 245 | Marion | 39 40 43 N | 085 58 15 W |
| Indian Creek Hill Cemetery | Cemetery | 249 | Montgomery | 39 56 01 N | 086 58 04 W |
| Indian Creek School | School | 257 | Marion | 39 51 17 N | 085 58 35 W |
| Indian Creek School | School | 287 | Monroe | 39 02 55 N | 086 36 38 W |
| Indian Creek Settlement | Populated Place | 144 | Knox | 38 43 45 N | 087 20 44 W |
| Indian Fork | Stream | | Perry | 38 04 31 N | 086 32 09 W |
| Indian Fort | Locale | 129 | Warrick | 38 11 04 N | 087 05 48 W |
| Indian Heights | Populated Place | 261 | Howard | 40 25 38 N | 086 07 32 W |
| Indian Hill | Populated Place | 210 | Starke | 41 19 31 N | 086 41 00 W |
| Indian Hills | Populated Place | 309 | Steuben | 41 37 20 N | 085 09 21 W |
| Indian Hollow | Valley | | Crawford | 38 11 58 N | 086 21 45 W |
| Indian Kentuck Cemetery | Cemetery | 275 | Jefferson | 38 52 21 N | 085 19 23 W |
| Indian Kentuck Church | Church | 289 | Jefferson | 38 52 22 N | 085 18 26 W |
| Indian Kentuck Creek | Stream | | Ripley | 38 43 54 N | 085 14 45 W |
| Indian Lake | Lake | 298 | DeKalb | 41 27 51 N | 085 10 08 W |
| Indian Lake | Lake | 276 | LaGrange | 41 32 30 N | 085 24 60 W |
| Indian Lake | Lake | 264 | Noble | 41 27 16 N | 085 34 48 W |
| Indian Lake | Lake | 278 | Noble | 41 22 30 N | 085 24 04 W |
| Indian Lake | Lake | 276 | Whitley | 41 12 43 N | 085 35 25 W |
| Indian Lake | Populated Place | 256 | Marion | 39 53 07 N | 085 59 13 W |
| Indian Lake | Reservoir | 235 | Marion | 39 52 53 N | 085 59 32 W |
| Indian Lake | Reservoir | 139 | Perry | 38 11 25 N | 086 39 20 W |
| Indian Lake | Reservoir | 275 | Whitley | 41 17 30 N | 085 34 49 W |
| Indian Lake Country Club | Locale | 258 | Marion | 39 53 30 N | 085 58 57 W |
| Indian Lake Dam | Dam | 208 | Bartholomew | 39 06 05 N | 086 02 50 W |
| Indian Lake Dam | Dam | 242 | Marion | 39 54 36 N | 085 59 12 W |