| Castellabate to Oerlinghausen | 861.03 mi (1,385.70 km) |
| Castellabate to Oestrich-Winkel | 751.52 mi (1,209.45 km) |
| Castellabate to Offenburg | 662.84 mi (1,066.74 km) |
| Castellabate to Oftersheim | 700.81 mi (1,127.84 km) |
| Castellabate to Ohrdruf | 756.61 mi (1,217.64 km) |
| Castellabate to Ohringen | 671.53 mi (1,080.72 km) |
| Castellabate to Olbernhau | 721.96 mi (1,161.88 km) |
| Castellabate to Olching | 575.95 mi (926.91 km) |
| Castellabate to Oldenburg | 943.45 mi (1,518.34 km) |
| Castellabate to Oldenburg in Holstein | 986.94 mi (1,588.32 km) |
| Castellabate to Olfen | 868.67 mi (1,397.99 km) |
| Castellabate to Olpe | 816.80 mi (1,314.52 km) |
| Castellabate to Olsberg | 825.15 mi (1,327.96 km) |
| Castellabate to Oranienburg | 865.76 mi (1,393.31 km) |
| Castellabate to Ortenberg | 752.30 mi (1,210.71 km) |
