| Gloucester City to Octeville | 3,520.42 mi (5,665.57 km) |
| Gloucester City to Oignies | 3,694.29 mi (5,945.38 km) |
| Gloucester City to Oissel | 3,642.64 mi (5,862.26 km) |
| Gloucester City to Olivet | 3,714.16 mi (5,977.36 km) |
| Gloucester City to Ollioules | 4,023.51 mi (6,475.22 km) |
| Gloucester City to Olonne-sur-Mer | 3,587.28 mi (5,773.17 km) |
| Gloucester City to Oloron-Sainte-Marie | 3,728.19 mi (5,999.94 km) |
| Gloucester City to Onet Village | 3,840.48 mi (6,180.65 km) |
| Gloucester City to Onnaing | 3,721.14 mi (5,988.59 km) |
| Gloucester City to Orange | 3,946.35 mi (6,351.03 km) |
| Gloucester City to Orchies | 3,704.44 mi (5,961.73 km) |
| Gloucester City to Orleans | 3,713.52 mi (5,976.33 km) |
| Gloucester City to Orly | 3,712.51 mi (5,974.70 km) |
| Gloucester City to Ormesson-sur-Marne | 3,717.59 mi (5,982.88 km) |
| Gloucester City to Orsay | 3,704.98 mi (5,962.58 km) |
