| Reno to Orbetello | 5,996.98 mi (9,651.21 km) |
| Reno to Oria | 6,292.13 mi (10,126.21 km) |
| Reno to Oristano | 6,056.97 mi (9,747.75 km) |
| Reno to Orta Nova | 6,190.24 mi (9,962.23 km) |
| Reno to Orte | 6,030.32 mi (9,704.87 km) |
| Reno to Ortona | 6,094.38 mi (9,807.96 km) |
| Reno to Orvieto | 6,007.68 mi (9,668.42 km) |
| Reno to Orzinuovi | 5,794.19 mi (9,324.85 km) |
| Reno to Osimo | 6,003.52 mi (9,661.73 km) |
| Reno to Ospitaletto | 5,789.61 mi (9,317.47 km) |
| Reno to Ostuni | 6,277.01 mi (10,101.87 km) |
| Reno to Ottaviano | 6,183.01 mi (9,950.59 km) |
| Reno to Ovada | 5,798.38 mi (9,331.59 km) |
| Reno to Ozieri | 6,032.62 mi (9,708.57 km) |
| Reno to Paceco | 6,289.34 mi (10,121.72 km) |
