| Americus to Orbetello | 5,016.04 mi (8,072.53 km) |
| Americus to Oria | 5,370.87 mi (8,643.58 km) |
| Americus to Oristano | 4,975.97 mi (8,008.04 km) |
| Americus to Orta Nova | 5,255.31 mi (8,457.61 km) |
| Americus to Orte | 5,068.08 mi (8,156.29 km) |
| Americus to Ortona | 5,161.55 mi (8,306.71 km) |
| Americus to Orvieto | 5,047.26 mi (8,122.78 km) |
| Americus to Orzinuovi | 4,866.27 mi (7,831.51 km) |
| Americus to Osimo | 5,082.78 mi (8,179.94 km) |
| Americus to Ospitaletto | 4,867.61 mi (7,833.66 km) |
| Americus to Ostuni | 5,360.13 mi (8,626.29 km) |
| Americus to Ottaviano | 5,216.69 mi (8,395.46 km) |
| Americus to Ovada | 4,832.80 mi (7,777.64 km) |
| Americus to Ozieri | 4,973.86 mi (8,004.66 km) |
| Americus to Paceco | 5,226.23 mi (8,410.80 km) |
