| San Gwann to Oberkirch | 930.75 mi (1,497.90 km) |
| San Gwann to Obernburg am Main | 999.07 mi (1,607.85 km) |
| San Gwann to Obernkirchen | 1,160.25 mi (1,867.24 km) |
| San Gwann to Oberschleissheim | 865.46 mi (1,392.82 km) |
| San Gwann to Oberstdorf | 823.30 mi (1,324.98 km) |
| San Gwann to Obertraubling | 909.66 mi (1,463.96 km) |
| San Gwann to Obertshausen | 1,018.19 mi (1,638.61 km) |
| San Gwann to Oberursel | 1,030.75 mi (1,658.83 km) |
| San Gwann to Ochsenfurt | 974.94 mi (1,569.02 km) |
| San Gwann to Ochsenhausen | 871.57 mi (1,402.66 km) |
| San Gwann to Ochtrup | 1,181.22 mi (1,900.99 km) |
| San Gwann to Odenthal | 1,106.88 mi (1,781.35 km) |
| San Gwann to Oelde | 1,143.42 mi (1,840.16 km) |
| San Gwann to Oelsnitz | 1,008.97 mi (1,623.79 km) |
| San Gwann to Oer-Erkenschwick | 1,143.89 mi (1,840.92 km) |
