| Gloucester City to Oerlinghausen | 3,882.81 mi (6,248.78 km) |
| Gloucester City to Oestrich-Winkel | 3,911.05 mi (6,294.23 km) |
| Gloucester City to Offenburg | 3,952.42 mi (6,360.81 km) |
| Gloucester City to Oftersheim | 3,952.88 mi (6,361.55 km) |
| Gloucester City to Ohrdruf | 3,996.38 mi (6,431.56 km) |
| Gloucester City to Ohringen | 3,995.23 mi (6,429.69 km) |
| Gloucester City to Olbernhau | 4,103.35 mi (6,603.70 km) |
| Gloucester City to Olching | 4,100.11 mi (6,598.49 km) |
| Gloucester City to Oldenburg | 3,833.68 mi (6,169.70 km) |
| Gloucester City to Oldenburg in Holstein | 3,903.21 mi (6,281.61 km) |
| Gloucester City to Olfen | 3,839.16 mi (6,178.54 km) |
| Gloucester City to Olpe | 3,875.99 mi (6,237.80 km) |
| Gloucester City to Olsberg | 3,892.60 mi (6,264.53 km) |
| Gloucester City to Oranienburg | 4,035.53 mi (6,494.56 km) |
| Gloucester City to Ortenberg | 3,943.44 mi (6,346.35 km) |
