| Rheinberg to Oerlinghausen | 93.00 mi (149.68 km) |
| Rheinberg to Oestrich-Winkel | 123.12 mi (198.14 km) |
| Rheinberg to Offenburg | 220.87 mi (355.46 km) |
| Rheinberg to Oftersheim | 173.83 mi (279.76 km) |
| Rheinberg to Ohrdruf | 185.68 mi (298.82 km) |
| Rheinberg to Ohringen | 206.40 mi (332.16 km) |
| Rheinberg to Olbernhau | 298.22 mi (479.94 km) |
| Rheinberg to Olching | 312.24 mi (502.49 km) |
| Rheinberg to Oldenburg | 129.67 mi (208.68 km) |
| Rheinberg to Oldenburg in Holstein | 260.70 mi (419.56 km) |
| Rheinberg to Olfen | 35.56 mi (57.23 km) |
| Rheinberg to Olpe | 64.64 mi (104.04 km) |
| Rheinberg to Olsberg | 82.20 mi (132.29 km) |
| Rheinberg to Oranienburg | 293.33 mi (472.08 km) |
| Rheinberg to Ortenberg | 134.85 mi (217.01 km) |
