| Gahanna to Olympia Heights (Florida) | 998.79 mi (1,607.39 km) |
| Gahanna to Omaha (Nebraska) | 696.04 mi (1,120.17 km) |
| Gahanna to On Top of the World Designated Place (Florida) | 755.16 mi (1,215.31 km) |
| Gahanna to Onalaska (Wisconsin) | 504.64 mi (812.14 km) |
| Gahanna to Oneida (New York) | 427.70 mi (688.32 km) |
| Gahanna to Oneonta (New York) | 438.29 mi (705.37 km) |
| Gahanna to Ontario (California) | 1,947.46 mi (3,134.13 km) |
| Gahanna to Ontario (Oregon) | 1,759.66 mi (2,831.90 km) |
| Gahanna to Opa-locka (Florida) | 987.48 mi (1,589.20 km) |
| Gahanna to Opelika (Alabama) | 527.60 mi (849.09 km) |
| Gahanna to Opelousas (Louisiana) | 836.32 mi (1,345.93 km) |
| Gahanna to Orange (California) | 1,965.13 mi (3,162.57 km) |
| Gahanna to Orange (Texas) | 919.29 mi (1,479.45 km) |
| Gahanna to Orange City (Florida) | 771.46 mi (1,241.55 km) |
| Gahanna to Orangeburg (South Carolina) | 464.63 mi (747.76 km) |
