| Giresun to Olympia Heights (Florida) | 6,388.50 mi (10,281.29 km) |
| Giresun to Omaha (Nebraska) | 6,082.95 mi (9,789.57 km) |
| Giresun to On Top of the World Designated Place (Florida) | 6,290.73 mi (10,123.95 km) |
| Giresun to Onalaska (Wisconsin) | 5,794.33 mi (9,325.08 km) |
| Giresun to Oneida (New York) | 5,330.75 mi (8,579.02 km) |
| Giresun to Oneonta (New York) | 5,339.61 mi (8,593.28 km) |
| Giresun to Ontario (California) | 7,037.47 mi (11,325.71 km) |
| Giresun to Ontario (Oregon) | 6,371.74 mi (10,254.32 km) |
| Giresun to Opa-locka (Florida) | 6,375.96 mi (10,261.12 km) |
| Giresun to Opelika (Alabama) | 6,218.97 mi (10,008.46 km) |
| Giresun to Opelousas (Louisiana) | 6,574.57 mi (10,580.74 km) |
| Giresun to Orange (California) | 7,056.79 mi (11,356.80 km) |
| Giresun to Orange (Texas) | 6,654.54 mi (10,709.44 km) |
| Giresun to Orange City (Florida) | 6,260.26 mi (10,074.91 km) |
| Giresun to Orangeburg (South Carolina) | 6,006.80 mi (9,667.00 km) |
