| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Seagrave | city | Ohio | United States | 40.01 | -83.03 | 830 | |
| Seal | city | Ohio | United States | 40.88 | -83.15 | 898 | |
| Sealover (historical) | city | Ohio | United States | 39.87 | -81.97 | 830 | |
| Seaman | city | Ohio | United States | 38.94 | -83.57 | 898 | |
| Seamersville | city | Ohio | United States | 40.93 | -84.42 | 830 | |
| Seans Woods | city | Ohio | United States | 39.96 | -83.81 | 997 | |
| Seawright (historical) | city | Ohio | United States | 39.90 | -81.85 | 830 | |
| Sebastian | city | Ohio | United States | 40.44 | -84.52 | 935 | |
| Sebring | city | Ohio | United States | 40.92 | -81.02 | 1095 | |
| Secor Woods | city | Ohio | United States | 41.57 | -83.60 | 830 | |
| Sedamsville | city | Ohio | United States | 39.09 | -84.57 | 830 | |
| Sedan | city | Ohio | United States | 38.95 | -83.12 | 830 | |
| Seeleyburg (historical) | city | Ohio | United States | 39.72 | -81.67 | 928 | |
| Sego | city | Ohio | United States | 39.85 | -82.21 | 872 | |
| Seitz | city | Ohio | United States | 40.92 | -84.18 | 830 | |
| Sekitan | city | Ohio | United States | 39.14 | -84.72 | 830 | |
| Selig | city | Ohio | United States | 38.74 | -83.35 | 908 | |
| Selma | city | Ohio | United States | 39.79 | -83.71 | 1099 | |
| Semples | city | Ohio | United States | 41.09 | -82.30 | 997 | |
| Seneca Lake Estates | city | Ohio | United States | 39.92 | -81.39 | 997 | |
| Senecaville | city | Ohio | United States | 39.93 | -81.46 | 830 | |
| Senior | city | Ohio | United States | 39.39 | -84.09 | 830 | |
| Sentinel | city | Ohio | United States | 41.63 | -80.72 | 1043 | |
| Serenity Shores | city | Ohio | United States | 40.86 | -81.51 | 1072 | |
| Seven Hills | city | Ohio | United States | 41.40 | -81.68 | 918 | |
| Seven Mile | city | Ohio | United States | 39.48 | -84.55 | 830 | |
| Seville | city | Ohio | United States | 41.01 | -81.86 | 987 | |
| Seward | city | Ohio | United States | 41.70 | -84.04 | 830 | |
| Sewellsville | city | Ohio | United States | 40.10 | -81.21 | 1669 | |
| Seymoreville (historical) | city | Ohio | United States | 39.34 | -82.95 | 830 |