| Gahanna to Odessa (Texas) | 1,222.62 mi (1,967.62 km) |
| Gahanna to Ogden (Utah) | 1,521.36 mi (2,448.40 km) |
| Gahanna to Oildale (California) | 1,987.91 mi (3,199.23 km) |
| Gahanna to Ojus (Florida) | 984.46 mi (1,584.33 km) |
| Gahanna to Okemos (Michigan) | 201.89 mi (324.90 km) |
| Gahanna to Oklahoma City (Oklahoma) | 858.79 mi (1,382.08 km) |
| Gahanna to Okmulgee (Oklahoma) | 778.42 mi (1,252.75 km) |
| Gahanna to Olathe (Kansas) | 642.22 mi (1,033.56 km) |
| Gahanna to Old Jamestown (Missouri) | 404.28 mi (650.63 km) |
| Gahanna to Oldsmar (Florida) | 827.43 mi (1,331.62 km) |
| Gahanna to Olean (New York) | 271.07 mi (436.25 km) |
| Gahanna to Olive Branch (Mississippi) | 518.31 mi (834.14 km) |
| Gahanna to Olivehurst (California) | 2,046.01 mi (3,292.74 km) |
| Gahanna to Olney (Maryland) | 314.28 mi (505.79 km) |
| Gahanna to Olympia (Washington) | 2,039.23 mi (3,281.82 km) |
