| Castanet-Tolosan to Oria | 852.67 mi (1,372.24 km) |
| Castanet-Tolosan to Oristano | 442.55 mi (712.21 km) |
| Castanet-Tolosan to Orta Nova | 739.50 mi (1,190.10 km) |
| Castanet-Tolosan to Orte | 554.70 mi (892.70 km) |
| Castanet-Tolosan to Ortona | 656.94 mi (1,057.24 km) |
| Castanet-Tolosan to Orvieto | 537.69 mi (865.32 km) |
| Castanet-Tolosan to Orzinuovi | 435.65 mi (701.11 km) |
| Castanet-Tolosan to Osimo | 600.17 mi (965.88 km) |
| Castanet-Tolosan to Ospitaletto | 444.96 mi (716.10 km) |
| Castanet-Tolosan to Ostuni | 844.95 mi (1,359.82 km) |
| Castanet-Tolosan to Ottaviano | 688.76 mi (1,108.45 km) |
| Castanet-Tolosan to Ovada | 363.08 mi (584.32 km) |
| Castanet-Tolosan to Ozieri | 434.82 mi (699.77 km) |
| Castanet-Tolosan to Paceco | 692.45 mi (1,114.38 km) |
| Castanet-Tolosan to Pachino | 856.91 mi (1,379.07 km) |
