| Altadena to Orbetello | 6,249.26 mi (10,057.21 km) |
| Altadena to Oria | 6,558.06 mi (10,554.18 km) |
| Altadena to Oristano | 6,293.25 mi (10,128.01 km) |
| Altadena to Orta Nova | 6,452.61 mi (10,384.47 km) |
| Altadena to Orte | 6,286.09 mi (10,116.49 km) |
| Altadena to Ortona | 6,355.72 mi (10,228.54 km) |
| Altadena to Orvieto | 6,263.41 mi (10,079.98 km) |
| Altadena to Orzinuovi | 6,051.95 mi (9,739.68 km) |
| Altadena to Osimo | 6,265.43 mi (10,083.24 km) |
| Altadena to Ospitaletto | 6,048.23 mi (9,733.68 km) |
| Altadena to Ostuni | 6,543.40 mi (10,530.59 km) |
| Altadena to Ottaviano | 6,440.30 mi (10,364.66 km) |
| Altadena to Ovada | 6,050.24 mi (9,736.92 km) |
| Altadena to Ozieri | 6,272.41 mi (10,094.47 km) |
| Altadena to Paceco | 6,532.04 mi (10,512.31 km) |
