| Somerville to Orbetello | 4,017.09 mi (6,464.88 km) |
| Somerville to Oria | 4,369.49 mi (7,032.01 km) |
| Somerville to Oristano | 3,988.91 mi (6,419.54 km) |
| Somerville to Orta Nova | 4,254.14 mi (6,846.38 km) |
| Somerville to Orte | 4,067.78 mi (6,546.45 km) |
| Somerville to Ortona | 4,159.38 mi (6,693.88 km) |
| Somerville to Orvieto | 4,046.59 mi (6,512.35 km) |
| Somerville to Orzinuovi | 3,861.30 mi (6,214.17 km) |
| Somerville to Osimo | 4,078.95 mi (6,564.44 km) |
| Somerville to Ospitaletto | 3,862.21 mi (6,215.63 km) |
| Somerville to Ostuni | 4,358.27 mi (7,013.95 km) |
| Somerville to Ottaviano | 4,218.19 mi (6,788.52 km) |
| Somerville to Ovada | 3,830.66 mi (6,164.86 km) |
| Somerville to Ozieri | 3,983.67 mi (6,411.10 km) |
| Somerville to Paceco | 4,239.66 mi (6,823.07 km) |
