| Canals to Oerlinghausen | 1,002.35 mi (1,613.13 km) |
| Canals to Oestrich-Winkel | 870.93 mi (1,401.63 km) |
| Canals to Offenburg | 781.41 mi (1,257.57 km) |
| Canals to Oftersheim | 849.37 mi (1,366.94 km) |
| Canals to Ohrdruf | 987.06 mi (1,588.52 km) |
| Canals to Ohringen | 864.97 mi (1,392.03 km) |
| Canals to Olbernhau | 1,054.49 mi (1,697.04 km) |
| Canals to Olching | 871.13 mi (1,401.95 km) |
| Canals to Oldenburg | 1,065.01 mi (1,713.97 km) |
| Canals to Oldenburg in Holstein | 1,187.86 mi (1,911.68 km) |
| Canals to Olfen | 961.17 mi (1,546.86 km) |
| Canals to Olpe | 927.57 mi (1,492.78 km) |
| Canals to Olsberg | 961.59 mi (1,547.53 km) |
| Canals to Oranienburg | 1,157.82 mi (1,863.33 km) |
| Canals to Ortenberg | 917.14 mi (1,475.99 km) |
