| Hudiksvall to Orbetello | 1,355.12 mi (2,180.85 km) |
| Hudiksvall to Oria | 1,467.24 mi (2,361.29 km) |
| Hudiksvall to Oristano | 1,550.31 mi (2,494.98 km) |
| Hudiksvall to Orta Nova | 1,410.89 mi (2,270.61 km) |
| Hudiksvall to Orte | 1,345.84 mi (2,165.92 km) |
| Hudiksvall to Ortona | 1,343.94 mi (2,162.86 km) |
| Hudiksvall to Orvieto | 1,329.84 mi (2,140.18 km) |
| Hudiksvall to Orzinuovi | 1,164.70 mi (1,874.40 km) |
| Hudiksvall to Osimo | 1,269.65 mi (2,043.31 km) |
| Hudiksvall to Ospitaletto | 1,152.81 mi (1,855.27 km) |
| Hudiksvall to Ostuni | 1,451.09 mi (2,335.30 km) |
| Hudiksvall to Ottaviano | 1,447.11 mi (2,328.90 km) |
| Hudiksvall to Ovada | 1,229.62 mi (1,978.89 km) |
| Hudiksvall to Ozieri | 1,500.22 mi (2,414.37 km) |
| Hudiksvall to Paceco | 1,652.58 mi (2,659.56 km) |
