| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Iberia | city | Ohio | United States | 40.67 | -82.84 | 1108 | |
| Ida (historical) | city | Ohio | United States | 38.57 | -82.43 | 885 | |
| Idaho | city | Ohio | United States | 39.09 | -83.14 | 830 | |
| Ideal | city | Ohio | United States | 39.98 | -81.53 | 830 | |
| Ideal Mobile Home Park | city | Ohio | United States | 41.42 | -81.70 | 830 | |
| Ideal Mobile Home Park | city | Ohio | United States | 39.62 | -84.29 | 830 | |
| Idlewild | city | Ohio | United States | 40.55 | -84.49 | 875 | |
| Idlewild | city | Ohio | United States | 39.15 | -84.48 | 830 | |
| Idlewild Park (historical) | city | Ohio | United States | 40.03 | -82.44 | 997 | |
| Idlewood | city | Ohio | United States | 39.15 | -84.47 | 830 | |
| Idlewood Cottage Area | city | Ohio | United States | 40.64 | -82.33 | 1177 | |
| Idlewood Manor | city | Ohio | United States | 39.95 | -82.83 | 830 | |
| Iler | city | Ohio | United States | 41.19 | -83.32 | 830 | |
| Ilesboro | city | Ohio | United States | 39.43 | -82.45 | 997 | |
| Immergrun | city | Ohio | United States | 41.69 | -83.42 | 830 | |
| Imperial Mobile Home Park | city | Ohio | United States | 41.14 | -80.88 | 1003 | |
| Imrek Acres | city | Ohio | United States | 40.98 | -81.45 | 1112 | |
| Independence | city | Ohio | United States | 41.30 | -84.30 | 830 | |
| Independence | city | Ohio | United States | 41.37 | -81.64 | 862 | |
| Indian Camp | city | Ohio | United States | 40.09 | -81.65 | 912 | |
| Indian Creek | city | Ohio | United States | 41.56 | -83.51 | 830 | |
| Indian Head Village | city | Ohio | United States | 40.98 | -81.91 | 997 | |
| Indian Hill | city | Ohio | United States | 39.18 | -84.35 | 830 | |
| Indian Hill | city | Ohio | United States | 39.16 | -84.38 | 830 | |
| Indian Hills Mobile Court | city | Ohio | United States | 40.35 | -83.70 | 1669 | |
| Indian Knolls | city | Ohio | United States | 39.18 | -84.27 | 830 | |
| Indian Meadows | city | Ohio | United States | 41.54 | -83.65 | 830 | |
| Indian Springs | city | Ohio | United States | 39.36 | -84.53 | 830 | |
| Indian Springs | city | Ohio | United States | 41.26 | -83.06 | 830 | |
| Indian Springs Mobile Home Park | city | Ohio | United States | 41.19 | -81.58 | 830 | |
| Indian Trail Estates | city | Ohio | United States | 41.59 | -83.44 | 830 | |
| Indian Trails | city | Ohio | United States | 39.83 | -83.06 | 830 | |
| Indian Valley Estates | city | Ohio | United States | 39.86 | -83.93 | 898 | |
| Indian Village Mobile Home Park | city | Ohio | United States | 40.68 | -84.12 | 898 | |
| Indianola Estates | city | Ohio | United States | 40.81 | -81.44 | 1128 | |
| Indianview | city | Ohio | United States | 39.22 | -84.30 | 830 | |
| Industrial Heights | city | Ohio | United States | 40.77 | -81.38 | 1003 | |
| Industry | city | Ohio | United States | 41.08 | -81.19 | 1138 | |
| Infant of Prague Villa | city | Ohio | United States | 40.99 | -81.52 | 1026 | |
| Ingham (historical) | city | Ohio | United States | 39.31 | -82.30 | 830 | |
| Ingold Heights | city | Ohio | United States | 40.80 | -81.47 | 1095 | |
| Ingomar | city | Ohio | United States | 39.71 | -84.50 | 898 | |
| Inlet | city | Ohio | United States | 41.65 | -84.19 | 830 | |
| Innwood Mobile Home Park | city | Ohio | United States | 40.76 | -84.06 | 846 | |
| Ira | city | Ohio | United States | 41.18 | -81.58 | 830 | |
| Ireland | city | Ohio | United States | 39.26 | -81.77 | 830 | |
| Iron Bridge (historical) | city | Ohio | United States | 41.15 | -81.51 | 1030 | |
| Iron City | city | Ohio | United States | 40.34 | -83.75 | 1227 | |
| Irondale | city | Ohio | United States | 40.57 | -80.73 | 830 | |
| Ironspot | city | Ohio | United States | 39.82 | -82.06 | 921 | |
| Ironton | city | Ohio | United States | 38.54 | -82.68 | 830 | |
| Ironton Junction | city | Ohio | United States | 39.10 | -82.56 | 830 | |
| Ironville | city | Ohio | United States | 41.68 | -83.48 | 830 | |
| Irville | city | Ohio | United States | 40.05 | -82.13 | 898 | |
| Irvington | city | Ohio | United States | 39.84 | -84.26 | 830 | |
| Irvington (historical) | city | Ohio | United States | 38.94 | -83.55 | 830 | |
| Irwin | city | Ohio | United States | 40.12 | -83.49 | 997 | |
| Island | city | Ohio | United States | 40.92 | -80.75 | 1115 | |
| Island Creek | city | Ohio | United States | 40.45 | -80.68 | 1092 | |
| Island View | city | Ohio | United States | 40.52 | -83.89 | 987 | |
| Island View | city | Ohio | United States | 41.60 | -83.57 | 830 | |
| Isle Saint George | city | Ohio | United States | 41.72 | -82.82 | 830 | |
| Isleta | city | Ohio | United States | 40.27 | -81.67 | 830 | |
| Ithaca | city | Ohio | United States | 39.94 | -84.55 | 1000 | |
| Iva Dale Subdivision | city | Ohio | United States | 38.86 | -82.15 | 830 | |
| Ivorydale | city | Ohio | United States | 39.18 | -84.50 | 830 | |
| Ivorydale Junction | city | Ohio | United States | 39.17 | -84.50 | 830 | |
| Ixworth (historical) | city | Ohio | United States | 39.37 | -84.54 | 830 |