| Castanet-Tolosan to Novi di Modena | 475.06 mi (764.54 km) |
| Castanet-Tolosan to Novi Ligure | 371.29 mi (597.54 km) |
| Castanet-Tolosan to Nuoro | 459.21 mi (739.03 km) |
| Castanet-Tolosan to Occhiobello | 508.30 mi (818.03 km) |
| Castanet-Tolosan to Oderzo | 562.13 mi (904.66 km) |
| Castanet-Tolosan to Oggiono | 416.32 mi (670.00 km) |
| Castanet-Tolosan to Olbia | 446.86 mi (719.16 km) |
| Castanet-Tolosan to Oleggio | 379.48 mi (610.72 km) |
| Castanet-Tolosan to Olgiate Comasco | 398.95 mi (642.04 km) |
| Castanet-Tolosan to Olgiate Olona | 391.64 mi (630.28 km) |
| Castanet-Tolosan to Omegna | 376.36 mi (605.70 km) |
| Castanet-Tolosan to Opera | 401.79 mi (646.62 km) |
| Castanet-Tolosan to Oppeano | 493.35 mi (793.97 km) |
| Castanet-Tolosan to Orbassano | 315.99 mi (508.54 km) |
| Castanet-Tolosan to Orbetello | 496.37 mi (798.82 km) |
