| Alum Rock to Orbetello | 6,181.56 mi (9,948.25 km) |
| Alum Rock to Oria | 6,476.11 mi (10,422.30 km) |
| Alum Rock to Oristano | 6,241.64 mi (10,044.95 km) |
| Alum Rock to Orta Nova | 6,374.43 mi (10,258.65 km) |
| Alum Rock to Orte | 6,214.80 mi (10,001.75 km) |
| Alum Rock to Ortona | 6,278.63 mi (10,104.48 km) |
| Alum Rock to Orvieto | 6,192.15 mi (9,965.31 km) |
| Alum Rock to Orzinuovi | 5,978.62 mi (9,621.65 km) |
| Alum Rock to Osimo | 6,187.75 mi (9,958.22 km) |
| Alum Rock to Ospitaletto | 5,974.00 mi (9,614.23 km) |
| Alum Rock to Ostuni | 6,460.97 mi (10,397.92 km) |
| Alum Rock to Ottaviano | 6,367.41 mi (10,247.36 km) |
| Alum Rock to Ovada | 5,982.97 mi (9,628.67 km) |
| Alum Rock to Ozieri | 6,217.32 mi (10,005.80 km) |
| Alum Rock to Paceco | 6,474.04 mi (10,418.96 km) |
