| Castricum to Olivenza | 1,110.81 mi (1,787.67 km) |
| Castricum to Olot | 723.47 mi (1,164.31 km) |
| Castricum to Onate | 734.33 mi (1,181.79 km) |
| Castricum to Onda | 900.50 mi (1,449.22 km) |
| Castricum to Onteniente | 981.40 mi (1,579.40 km) |
| Castricum to Orihuela | 1,035.15 mi (1,665.91 km) |
| Castricum to Osuna | 1,158.79 mi (1,864.89 km) |
| Castricum to Ourense | 914.30 mi (1,471.42 km) |
| Castricum to Oviedo | 798.14 mi (1,284.48 km) |
| Castricum to Paiporta | 938.35 mi (1,510.12 km) |
| Castricum to Pajara | 1,928.51 mi (3,103.64 km) |
| Castricum to Palafolls | 757.10 mi (1,218.43 km) |
| Castricum to Palafrugell | 737.98 mi (1,187.66 km) |
| Castricum to Palamos | 743.06 mi (1,195.84 km) |
| Castricum to Palencia | 844.41 mi (1,358.94 km) |
