| River Falls to Oerlinghausen | 4,281.00 mi (6,889.61 km) |
| River Falls to Oestrich-Winkel | 4,342.37 mi (6,988.37 km) |
| River Falls to Offenburg | 4,406.34 mi (7,091.32 km) |
| River Falls to Oftersheim | 4,389.98 mi (7,064.99 km) |
| River Falls to Ohrdruf | 4,399.71 mi (7,080.65 km) |
| River Falls to Ohringen | 4,429.36 mi (7,128.36 km) |
| River Falls to Olbernhau | 4,493.42 mi (7,231.47 km) |
| River Falls to Olching | 4,537.22 mi (7,301.96 km) |
| River Falls to Oldenburg | 4,216.25 mi (6,785.40 km) |
| River Falls to Oldenburg in Holstein | 4,253.47 mi (6,845.30 km) |
| River Falls to Olfen | 4,248.24 mi (6,836.88 km) |
| River Falls to Olpe | 4,293.16 mi (6,909.18 km) |
| River Falls to Olsberg | 4,301.12 mi (6,921.99 km) |
| River Falls to Oranienburg | 4,395.95 mi (7,074.59 km) |
| River Falls to Ortenberg | 4,363.45 mi (7,022.29 km) |
