| Nelson to Orbetello | 998.21 mi (1,606.46 km) |
| Nelson to Oria | 1,302.32 mi (2,095.88 km) |
| Nelson to Oristano | 1,086.64 mi (1,748.78 km) |
| Nelson to Orta Nova | 1,195.30 mi (1,923.65 km) |
| Nelson to Orte | 1,030.76 mi (1,658.84 km) |
| Nelson to Ortona | 1,098.28 mi (1,767.50 km) |
| Nelson to Orvieto | 1,008.10 mi (1,622.38 km) |
| Nelson to Orzinuovi | 795.06 mi (1,279.52 km) |
| Nelson to Osimo | 1,008.16 mi (1,622.48 km) |
| Nelson to Ospitaletto | 790.96 mi (1,272.93 km) |
| Nelson to Ostuni | 1,288.07 mi (2,072.96 km) |
| Nelson to Ottaviano | 1,183.91 mi (1,905.32 km) |
| Nelson to Ovada | 800.54 mi (1,288.35 km) |
| Nelson to Ozieri | 1,053.29 mi (1,695.10 km) |
| Nelson to Paceco | 1,299.45 mi (2,091.26 km) |
