| Cascades to Oerlinghausen | 4,011.19 mi (6,455.39 km) |
| Cascades to Oestrich-Winkel | 4,040.95 mi (6,503.29 km) |
| Cascades to Offenburg | 4,083.28 mi (6,571.40 km) |
| Cascades to Oftersheim | 4,083.07 mi (6,571.07 km) |
| Cascades to Ohrdruf | 4,125.17 mi (6,638.81 km) |
| Cascades to Ohringen | 4,125.35 mi (6,639.11 km) |
| Cascades to Olbernhau | 4,231.66 mi (6,810.20 km) |
| Cascades to Olching | 4,230.47 mi (6,808.29 km) |
| Cascades to Oldenburg | 3,961.22 mi (6,374.97 km) |
| Cascades to Oldenburg in Holstein | 4,029.18 mi (6,484.34 km) |
| Cascades to Olfen | 3,967.99 mi (6,385.86 km) |
| Cascades to Olpe | 4,005.24 mi (6,445.80 km) |
| Cascades to Olsberg | 4,021.48 mi (6,471.94 km) |
| Cascades to Oranienburg | 4,162.27 mi (6,698.52 km) |
| Cascades to Ortenberg | 4,072.90 mi (6,554.69 km) |
