| Serpa to Orbetello | 1,037.74 mi (1,670.08 km) |
| Serpa to Oria | 1,357.37 mi (2,184.48 km) |
| Serpa to Oristano | 879.50 mi (1,415.42 km) |
| Serpa to Orta Nova | 1,258.18 mi (2,024.84 km) |
| Serpa to Orte | 1,096.84 mi (1,765.19 km) |
| Serpa to Ortona | 1,197.30 mi (1,926.87 km) |
| Serpa to Orvieto | 1,086.27 mi (1,748.18 km) |
| Serpa to Orzinuovi | 1,037.94 mi (1,670.41 km) |
| Serpa to Osimo | 1,164.70 mi (1,874.40 km) |
| Serpa to Ospitaletto | 1,048.47 mi (1,687.35 km) |
| Serpa to Ostuni | 1,354.64 mi (2,180.09 km) |
| Serpa to Ottaviano | 1,192.39 mi (1,918.97 km) |
| Serpa to Ovada | 959.39 mi (1,543.99 km) |
| Serpa to Ozieri | 905.20 mi (1,456.78 km) |
| Serpa to Paceco | 1,095.42 mi (1,762.91 km) |
