Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| House of Glory World Outreach | Church | 180 | Lake | 41 38 24 N | 087 26 53 W |
| House of Prayer Church of God in Christ | Church | 186 | Lake | 41 35 23 N | 087 17 17 W |
| House of the Lord Church | Church | 183 | Lake | 41 35 16 N | 087 20 45 W |
| Household of Israel Church | Church | 192 | Lake | 41 32 57 N | 087 19 35 W |
| Howard Branch Hammond Public Library | Building | 186 | Lake | 41 35 06 N | 087 26 31 W |
| Hungarian Reformed Church | Church | 178 | Lake | 41 40 44 N | 087 29 53 W |
| Hyde Park United Methodist Church | Church | 186 | Lake | 41 35 51 N | 087 31 00 W |
| Hyles-Anderson College | School | 211 | Lake | 41 28 03 N | 087 24 16 W |
| 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 |
| 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 |
| Immanuel Church | Church | 187 | Lake | 41 32 27 N | 087 28 31 W |
| Immanuel Presbyterian Church | Church | 198 | Lake | 41 29 22 N | 087 27 19 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 |
| Indi-Illi Park | Park | 183 | Lake | 41 35 26 N | 087 31 26 W |
| Indian Ridge Country Club | Locale | 195 | Lake | 41 30 06 N | 087 14 21 W |
| Indiana Harbor | Harbor | 175 | Lake | 41 40 12 N | 087 26 28 W |
| Indiana Harbor | Populated Place | 180 | Lake | 41 38 26 N | 087 26 43 W |
| Indiana Harbor Boat Club | Locale | 180 | Lake | 41 39 16 N | 087 26 18 W |
| Indiana Harbor Boat Club North Light | Locale | 175 | Lake | 41 39 16 N | 087 26 14 W |
| Indiana Harbor Boat Club South Light | Locale | 175 | Lake | 41 39 15 N | 087 26 11 W |
| Indiana Harbor Canal | Canal | 175 | Lake | 41 38 49 N | 087 28 14 W |
| Indiana Harbor Catholic Elementary School | Park | 180 | Lake | 41 38 30 N | 087 26 38 W |
| Indiana Harbor East Breakwater Light | Locale | 175 | Lake | 41 40 52 N | 087 26 28 W |
| Indiana Harbor East Bulkhead Light | Locale | 180 | Lake | 41 40 09 N | 087 24 39 W |
| Indiana Harbor Fire Station Number 2 | Building | 181 | Lake | 41 39 04 N | 087 26 51 W |
| Indiana Harbor Light 2 | Locale | 175 | Lake | 41 41 05 N | 087 26 50 W |
| Indiana Harbor Light 5 | Locale | 175 | Lake | 41 40 29 N | 087 26 19 W |