| Two Rivers to Oerlinghausen | 4,142.95 mi (6,667.43 km) |
| Two Rivers to Oestrich-Winkel | 4,196.69 mi (6,753.92 km) |
| Two Rivers to Offenburg | 4,255.60 mi (6,848.73 km) |
| Two Rivers to Oftersheim | 4,243.18 mi (6,828.73 km) |
| Two Rivers to Ohrdruf | 4,261.11 mi (6,857.59 km) |
| Two Rivers to Ohringen | 4,283.49 mi (6,893.61 km) |
| Two Rivers to Olbernhau | 4,358.58 mi (7,014.46 km) |
| Two Rivers to Olching | 4,391.22 mi (7,066.99 km) |
| Two Rivers to Oldenburg | 4,081.59 mi (6,568.68 km) |
| Two Rivers to Oldenburg in Holstein | 4,126.92 mi (6,641.63 km) |
| Two Rivers to Olfen | 4,107.36 mi (6,610.15 km) |
| Two Rivers to Olpe | 4,150.60 mi (6,679.74 km) |
| Two Rivers to Olsberg | 4,160.69 mi (6,695.98 km) |
| Two Rivers to Oranienburg | 4,267.79 mi (6,868.34 km) |
| Two Rivers to Ortenberg | 4,220.61 mi (6,792.41 km) |
