| River Falls to Orbetello | 4,799.08 mi (7,723.37 km) |
| River Falls to Oria | 5,129.98 mi (8,255.91 km) |
| River Falls to Oristano | 4,816.54 mi (7,751.47 km) |
| River Falls to Orta Nova | 5,018.84 mi (8,077.04 km) |
| River Falls to Orte | 4,841.87 mi (7,792.23 km) |
| River Falls to Ortona | 4,921.33 mi (7,920.11 km) |
| River Falls to Orvieto | 4,819.44 mi (7,756.14 km) |
| River Falls to Orzinuovi | 4,615.01 mi (7,427.14 km) |
| River Falls to Osimo | 4,833.60 mi (7,778.93 km) |
| River Falls to Ospitaletto | 4,613.05 mi (7,423.98 km) |
| River Falls to Ostuni | 5,116.52 mi (8,234.25 km) |
| River Falls to Ottaviano | 4,996.81 mi (8,041.58 km) |
| River Falls to Ovada | 4,602.01 mi (7,406.22 km) |
| River Falls to Ozieri | 4,801.14 mi (7,726.69 km) |
| River Falls to Paceco | 5,062.41 mi (8,147.17 km) |
