| Brock Hall to Orbetello | 4,397.74 mi (7,077.47 km) |
| Brock Hall to Oria | 4,750.89 mi (7,645.81 km) |
| Brock Hall to Oristano | 4,365.87 mi (7,026.19 km) |
| Brock Hall to Orta Nova | 4,635.47 mi (7,460.06 km) |
| Brock Hall to Orte | 4,448.83 mi (7,159.69 km) |
| Brock Hall to Ortona | 4,540.96 mi (7,307.98 km) |
| Brock Hall to Orvieto | 4,427.74 mi (7,125.75 km) |
| Brock Hall to Orzinuovi | 4,243.58 mi (6,829.38 km) |
| Brock Hall to Osimo | 4,460.96 mi (7,179.22 km) |
| Brock Hall to Ospitaletto | 4,244.59 mi (6,831.01 km) |
| Brock Hall to Ostuni | 4,739.79 mi (7,627.96 km) |
| Brock Hall to Ottaviano | 4,598.75 mi (7,400.98 km) |
| Brock Hall to Ovada | 4,212.18 mi (6,778.86 km) |
| Brock Hall to Ozieri | 4,361.63 mi (7,019.37 km) |
| Brock Hall to Paceco | 4,616.56 mi (7,429.64 km) |
