| Wittmund to Oria | 1,013.36 mi (1,630.85 km) |
| Wittmund to Oristano | 945.21 mi (1,521.17 km) |
| Wittmund to Orta Nova | 922.22 mi (1,484.16 km) |
| Wittmund to Orte | 796.47 mi (1,281.80 km) |
| Wittmund to Ortona | 832.96 mi (1,340.53 km) |
| Wittmund to Orvieto | 775.85 mi (1,248.62 km) |
| Wittmund to Orzinuovi | 572.97 mi (922.11 km) |
| Wittmund to Osimo | 743.90 mi (1,197.18 km) |
| Wittmund to Ospitaletto | 563.47 mi (906.82 km) |
| Wittmund to Ostuni | 997.55 mi (1,605.41 km) |
| Wittmund to Ottaviano | 932.69 mi (1,501.01 km) |
| Wittmund to Ovada | 618.63 mi (995.59 km) |
| Wittmund to Ozieri | 899.33 mi (1,447.34 km) |
| Wittmund to Paceco | 1,100.90 mi (1,771.72 km) |
| Wittmund to Pachino | 1,216.62 mi (1,957.96 km) |
