| Hudiksvall to Oberkirch | 977.18 mi (1,572.62 km) |
| Hudiksvall to Obernburg am Main | 876.68 mi (1,410.89 km) |
| Hudiksvall to Obernkirchen | 718.80 mi (1,156.80 km) |
| Hudiksvall to Oberschleissheim | 956.38 mi (1,539.15 km) |
| Hudiksvall to Oberstdorf | 1,025.50 mi (1,650.39 km) |
| Hudiksvall to Obertraubling | 902.68 mi (1,452.73 km) |
| Hudiksvall to Obertshausen | 865.98 mi (1,393.65 km) |
| Hudiksvall to Oberursel | 860.67 mi (1,385.12 km) |
| Hudiksvall to Ochsenfurt | 877.64 mi (1,412.42 km) |
| Hudiksvall to Ochsenhausen | 984.50 mi (1,584.39 km) |
| Hudiksvall to Ochtrup | 755.16 mi (1,215.31 km) |
| Hudiksvall to Odenthal | 830.25 mi (1,336.16 km) |
| Hudiksvall to Oelde | 761.98 mi (1,226.29 km) |
| Hudiksvall to Oelsnitz | 804.29 mi (1,294.38 km) |
| Hudiksvall to Oer-Erkenschwick | 789.40 mi (1,270.42 km) |
