| Niles to Orbetello | 4,735.83 mi (7,621.58 km) |
| Niles to Oria | 5,076.81 mi (8,170.33 km) |
| Niles to Oristano | 4,735.17 mi (7,620.52 km) |
| Niles to Orta Nova | 4,963.46 mi (7,987.92 km) |
| Niles to Orte | 4,781.91 mi (7,695.74 km) |
| Niles to Ortona | 4,866.47 mi (7,831.83 km) |
| Niles to Orvieto | 4,759.84 mi (7,660.22 km) |
| Niles to Orzinuovi | 4,561.52 mi (7,341.06 km) |
| Niles to Osimo | 4,781.04 mi (7,694.33 km) |
| Niles to Ospitaletto | 4,560.63 mi (7,339.62 km) |
| Niles to Ostuni | 5,064.13 mi (8,149.94 km) |
| Niles to Ottaviano | 4,935.92 mi (7,943.59 km) |
| Niles to Ovada | 4,541.76 mi (7,309.25 km) |
| Niles to Ozieri | 4,723.83 mi (7,602.27 km) |
| Niles to Paceco | 4,984.20 mi (8,021.29 km) |
