| Castanet-Tolosan to Obernburg am Main | 567.05 mi (912.57 km) |
| Castanet-Tolosan to Obernkirchen | 699.25 mi (1,125.34 km) |
| Castanet-Tolosan to Oberschleissheim | 583.66 mi (939.31 km) |
| Castanet-Tolosan to Oberstdorf | 503.00 mi (809.49 km) |
| Castanet-Tolosan to Obertraubling | 632.85 mi (1,018.48 km) |
| Castanet-Tolosan to Obertshausen | 569.75 mi (916.93 km) |
| Castanet-Tolosan to Oberursel | 569.85 mi (917.08 km) |
| Castanet-Tolosan to Ochsenfurt | 586.83 mi (944.41 km) |
| Castanet-Tolosan to Ochsenhausen | 514.11 mi (827.38 km) |
| Castanet-Tolosan to Ochtrup | 655.35 mi (1,054.68 km) |
| Castanet-Tolosan to Odenthal | 581.98 mi (936.60 km) |
| Castanet-Tolosan to Oelde | 652.08 mi (1,049.43 km) |
| Castanet-Tolosan to Oelsnitz | 691.85 mi (1,113.42 km) |
| Castanet-Tolosan to Oer-Erkenschwick | 621.75 mi (1,000.62 km) |
| Castanet-Tolosan to Oerlinghausen | 671.48 mi (1,080.64 km) |
