| Sumner to Orbetello | 5,619.98 mi (9,044.49 km) |
| Sumner to Oria | 5,894.21 mi (9,485.82 km) |
| Sumner to Oristano | 5,701.36 mi (9,175.45 km) |
| Sumner to Orta Nova | 5,797.91 mi (9,330.84 km) |
| Sumner to Orte | 5,648.26 mi (9,090.00 km) |
| Sumner to Ortona | 5,704.21 mi (9,180.04 km) |
| Sumner to Orvieto | 5,625.85 mi (9,053.93 km) |
| Sumner to Orzinuovi | 5,411.36 mi (8,708.74 km) |
| Sumner to Osimo | 5,613.28 mi (9,033.69 km) |
| Sumner to Ospitaletto | 5,405.64 mi (8,699.53 km) |
| Sumner to Ostuni | 5,878.58 mi (9,460.66 km) |
| Sumner to Ottaviano | 5,797.61 mi (9,330.35 km) |
| Sumner to Ovada | 5,423.66 mi (8,728.54 km) |
| Sumner to Ozieri | 5,672.42 mi (9,128.88 km) |
| Sumner to Paceco | 5,922.85 mi (9,531.90 km) |
