| Royston to Oberkirch | 431.93 mi (695.12 km) |
| Royston to Obernburg am Main | 426.64 mi (686.61 km) |
| Royston to Obernkirchen | 387.39 mi (623.44 km) |
| Royston to Oberschleissheim | 575.30 mi (925.85 km) |
| Royston to Oberstdorf | 559.76 mi (900.85 km) |
| Royston to Obertraubling | 575.42 mi (926.04 km) |
| Royston to Obertshausen | 407.80 mi (656.29 km) |
| Royston to Oberursel | 393.69 mi (633.58 km) |
| Royston to Ochsenfurt | 469.68 mi (755.87 km) |
| Royston to Ochsenhausen | 519.84 mi (836.60 km) |
| Royston to Ochtrup | 305.92 mi (492.34 km) |
| Royston to Odenthal | 314.45 mi (506.07 km) |
| Royston to Oelde | 348.14 mi (560.27 km) |
| Royston to Oelsnitz | 538.47 mi (866.58 km) |
| Royston to Oer-Erkenschwick | 311.49 mi (501.30 km) |
