| Frederikssund to Oria | 1,089.17 mi (1,752.85 km) |
| Frederikssund to Oristano | 1,111.85 mi (1,789.35 km) |
| Frederikssund to Orta Nova | 1,015.42 mi (1,634.16 km) |
| Frederikssund to Orte | 924.09 mi (1,487.19 km) |
| Frederikssund to Ortona | 937.43 mi (1,508.65 km) |
| Frederikssund to Orvieto | 906.16 mi (1,458.32 km) |
| Frederikssund to Orzinuovi | 726.82 mi (1,169.71 km) |
| Frederikssund to Osimo | 855.60 mi (1,376.96 km) |
| Frederikssund to Ospitaletto | 715.40 mi (1,151.33 km) |
| Frederikssund to Ostuni | 1,072.85 mi (1,726.59 km) |
| Frederikssund to Ottaviano | 1,040.99 mi (1,675.31 km) |
| Frederikssund to Ovada | 787.82 mi (1,267.87 km) |
| Frederikssund to Ozieri | 1,062.70 mi (1,710.25 km) |
| Frederikssund to Paceco | 1,233.52 mi (1,985.16 km) |
| Frederikssund to Pachino | 1,328.43 mi (2,137.91 km) |
