| Gloucester City to Oberkirch | 3,956.69 mi (6,367.68 km) |
| Gloucester City to Obernburg am Main | 3,961.83 mi (6,375.95 km) |
| Gloucester City to Obernkirchen | 3,892.14 mi (6,263.79 km) |
| Gloucester City to Oberschleissheim | 4,108.77 mi (6,612.43 km) |
| Gloucester City to Oberstdorf | 4,082.02 mi (6,569.38 km) |
| Gloucester City to Obertraubling | 4,110.55 mi (6,615.29 km) |
| Gloucester City to Obertshausen | 3,942.83 mi (6,345.37 km) |
| Gloucester City to Oberursel | 3,928.58 mi (6,322.44 km) |
| Gloucester City to Ochsenfurt | 4,004.79 mi (6,445.09 km) |
| Gloucester City to Ochsenhausen | 4,047.73 mi (6,514.19 km) |
| Gloucester City to Ochtrup | 3,818.64 mi (6,145.50 km) |
| Gloucester City to Odenthal | 3,846.92 mi (6,191.02 km) |
| Gloucester City to Oelde | 3,866.21 mi (6,222.07 km) |
| Gloucester City to Oelsnitz | 4,065.34 mi (6,542.53 km) |
| Gloucester City to Oer-Erkenschwick | 3,835.92 mi (6,173.31 km) |
