| Castricum to Oerlinghausen | 173.88 mi (279.83 km) |
| Castricum to Oestrich-Winkel | 227.55 mi (366.20 km) |
| Castricum to Offenburg | 316.46 mi (509.30 km) |
| Castricum to Oftersheim | 278.00 mi (447.39 km) |
| Castricum to Ohrdruf | 285.65 mi (459.71 km) |
| Castricum to Ohringen | 312.88 mi (503.53 km) |
| Castricum to Olbernhau | 393.69 mi (633.58 km) |
| Castricum to Olching | 419.43 mi (675.01 km) |
| Castricum to Oldenburg | 153.58 mi (247.17 km) |
| Castricum to Oldenburg in Holstein | 282.94 mi (455.34 km) |
| Castricum to Olfen | 128.79 mi (207.26 km) |
| Castricum to Olpe | 171.86 mi (276.57 km) |
| Castricum to Olsberg | 182.43 mi (293.59 km) |
| Castricum to Oranienburg | 359.29 mi (578.22 km) |
| Castricum to Ortenberg | 242.18 mi (389.76 km) |
