| Gahanna to Oswego (Illinois) | 308.07 mi (495.79 km) |
| Gahanna to Oswego (New York) | 404.38 mi (650.78 km) |
| Gahanna to Otsego (Minnesota) | 654.85 mi (1,053.87 km) |
| Gahanna to Ottawa (Illinois) | 325.53 mi (523.89 km) |
| Gahanna to Ottawa (Kansas) | 669.58 mi (1,077.59 km) |
| Gahanna to Ottumwa (Iowa) | 506.26 mi (814.74 km) |
| Gahanna to Overland (Missouri) | 411.17 mi (661.71 km) |
| Gahanna to Overland Park (Kansas) | 635.15 mi (1,022.17 km) |
| Gahanna to Overlea (Maryland) | 340.39 mi (547.81 km) |
| Gahanna to Oviedo (Florida) | 791.15 mi (1,273.23 km) |
| Gahanna to Owasso (Oklahoma) | 749.47 mi (1,206.16 km) |
| Gahanna to Owatonna (Minnesota) | 600.86 mi (966.99 km) |
| Gahanna to Owensboro (Kentucky) | 277.20 mi (446.12 km) |
| Gahanna to Owings Mills (Maryland) | 325.43 mi (523.73 km) |
| Gahanna to Owosso (Michigan) | 216.17 mi (347.89 km) |
