| Denison to Orbetello | 5,471.31 mi (8,805.23 km) |
| Denison to Oria | 5,815.05 mi (9,358.42 km) |
| Denison to Oristano | 5,462.95 mi (8,791.77 km) |
| Denison to Orta Nova | 5,701.20 mi (9,175.19 km) |
| Denison to Orte | 5,518.45 mi (8,881.09 km) |
| Denison to Ortona | 5,604.49 mi (9,019.56 km) |
| Denison to Orvieto | 5,496.53 mi (8,845.81 km) |
| Denison to Orzinuovi | 5,300.31 mi (8,530.02 km) |
| Denison to Osimo | 5,519.81 mi (8,883.27 km) |
| Denison to Ospitaletto | 5,299.70 mi (8,529.04 km) |
| Denison to Ostuni | 5,802.62 mi (9,338.42 km) |
| Denison to Ottaviano | 5,671.92 mi (9,128.07 km) |
| Denison to Ovada | 5,278.56 mi (8,495.03 km) |
| Denison to Ozieri | 5,453.59 mi (8,776.70 km) |
| Denison to Paceco | 5,712.94 mi (9,194.08 km) |
