| Castanet-Tolosan to Mouscron | 505.16 mi (812.97 km) |
| Castanet-Tolosan to Namur | 505.69 mi (813.84 km) |
| Castanet-Tolosan to Neder-Over-Heembeek | 527.77 mi (849.36 km) |
| Castanet-Tolosan to Neerpelt | 563.92 mi (907.55 km) |
| Castanet-Tolosan to Nevele | 528.20 mi (850.05 km) |
| Castanet-Tolosan to Niel | 541.61 mi (871.63 km) |
| Castanet-Tolosan to Nieuwpoort | 528.43 mi (850.42 km) |
| Castanet-Tolosan to Nijlen | 548.71 mi (883.07 km) |
| Castanet-Tolosan to Ninove | 519.17 mi (835.53 km) |
| Castanet-Tolosan to Nivelles | 505.94 mi (814.23 km) |
| Castanet-Tolosan to Olen | 550.19 mi (885.44 km) |
| Castanet-Tolosan to Oostakker | 534.63 mi (860.40 km) |
| Castanet-Tolosan to Oosterzele | 524.83 mi (844.63 km) |
| Castanet-Tolosan to Oostkamp | 533.98 mi (859.36 km) |
| Castanet-Tolosan to Opglabbeek | 554.45 mi (892.30 km) |
