| Harstad to Oerlinghausen | 1,191.55 mi (1,917.61 km) |
| Harstad to Oestrich-Winkel | 1,330.35 mi (2,141.00 km) |
| Harstad to Offenburg | 1,435.44 mi (2,310.12 km) |
| Harstad to Oftersheim | 1,369.26 mi (2,203.60 km) |
| Harstad to Ohrdruf | 1,256.79 mi (2,022.60 km) |
| Harstad to Ohringen | 1,375.20 mi (2,213.16 km) |
| Harstad to Olbernhau | 1,257.53 mi (2,023.80 km) |
| Harstad to Olching | 1,434.63 mi (2,308.82 km) |
| Harstad to Oldenburg | 1,114.88 mi (1,794.23 km) |
| Harstad to Oldenburg in Holstein | 1,018.07 mi (1,638.43 km) |
| Harstad to Olfen | 1,218.33 mi (1,960.72 km) |
| Harstad to Olpe | 1,262.35 mi (2,031.55 km) |
| Harstad to Olsberg | 1,234.87 mi (1,987.33 km) |
| Harstad to Oranienburg | 1,113.93 mi (1,792.69 km) |
| Harstad to Ortenberg | 1,298.84 mi (2,090.29 km) |
