| Harstad to Oberkirch | 1,429.85 mi (2,301.13 km) |
| Harstad to Obernburg am Main | 1,333.56 mi (2,146.16 km) |
| Harstad to Obernkirchen | 1,167.98 mi (1,879.68 km) |
| Harstad to Oberschleissheim | 1,430.15 mi (2,301.60 km) |
| Harstad to Oberstdorf | 1,493.78 mi (2,404.01 km) |
| Harstad to Obertraubling | 1,378.54 mi (2,218.55 km) |
| Harstad to Obertshausen | 1,320.05 mi (2,124.41 km) |
| Harstad to Oberursel | 1,312.43 mi (2,112.16 km) |
| Harstad to Ochsenfurt | 1,341.13 mi (2,158.34 km) |
| Harstad to Ochsenhausen | 1,450.01 mi (2,333.57 km) |
| Harstad to Ochtrup | 1,186.80 mi (1,909.96 km) |
| Harstad to Odenthal | 1,266.87 mi (2,038.84 km) |
| Harstad to Oelde | 1,204.41 mi (1,938.31 km) |
| Harstad to Oelsnitz | 1,278.65 mi (2,057.79 km) |
| Harstad to Oer-Erkenschwick | 1,224.47 mi (1,970.59 km) |
