| Amadora to Orbetello | 1,100.01 mi (1,770.30 km) |
| Amadora to Oria | 1,429.62 mi (2,300.75 km) |
| Amadora to Oristano | 954.62 mi (1,536.32 km) |
| Amadora to Orta Nova | 1,327.15 mi (2,135.84 km) |
| Amadora to Orte | 1,159.66 mi (1,866.29 km) |
| Amadora to Ortona | 1,261.49 mi (2,030.16 km) |
| Amadora to Orvieto | 1,147.61 mi (1,846.90 km) |
| Amadora to Orzinuovi | 1,082.06 mi (1,741.40 km) |
| Amadora to Osimo | 1,222.98 mi (1,968.20 km) |
| Amadora to Ospitaletto | 1,091.90 mi (1,757.25 km) |
| Amadora to Ostuni | 1,426.00 mi (2,294.93 km) |
| Amadora to Ottaviano | 1,263.36 mi (2,033.18 km) |
| Amadora to Ovada | 1,006.00 mi (1,619.00 km) |
| Amadora to Ozieri | 976.65 mi (1,571.76 km) |
| Amadora to Paceco | 1,178.56 mi (1,896.70 km) |
