| Hudiksvall to Oerlinghausen | 745.10 mi (1,199.13 km) |
| Hudiksvall to Oestrich-Winkel | 882.43 mi (1,420.13 km) |
| Hudiksvall to Offenburg | 983.66 mi (1,583.05 km) |
| Hudiksvall to Oftersheim | 915.14 mi (1,472.78 km) |
| Hudiksvall to Ohrdruf | 791.35 mi (1,273.56 km) |
| Hudiksvall to Ohringen | 914.44 mi (1,471.65 km) |
| Hudiksvall to Olbernhau | 778.00 mi (1,252.08 km) |
| Hudiksvall to Olching | 962.02 mi (1,548.22 km) |
| Hudiksvall to Oldenburg | 678.19 mi (1,091.43 km) |
| Hudiksvall to Oldenburg in Holstein | 561.38 mi (903.45 km) |
| Hudiksvall to Olfen | 782.38 mi (1,259.13 km) |
| Hudiksvall to Olpe | 819.37 mi (1,318.64 km) |
| Hudiksvall to Olsberg | 787.64 mi (1,267.58 km) |
| Hudiksvall to Oranienburg | 636.83 mi (1,024.88 km) |
| Hudiksvall to Ortenberg | 843.93 mi (1,358.17 km) |
