| Roermond to Oerlinghausen | 126.79 mi (204.05 km) |
| Roermond to Oestrich-Winkel | 121.22 mi (195.09 km) |
| Roermond to Offenburg | 207.87 mi (334.53 km) |
| Roermond to Oftersheim | 170.76 mi (274.81 km) |
| Roermond to Ohrdruf | 208.01 mi (334.76 km) |
| Roermond to Ohringen | 208.01 mi (334.76 km) |
| Roermond to Olbernhau | 322.03 mi (518.25 km) |
| Roermond to Olching | 315.72 mi (508.11 km) |
| Roermond to Oldenburg | 164.22 mi (264.28 km) |
| Roermond to Oldenburg in Holstein | 296.30 mi (476.85 km) |
| Roermond to Olfen | 70.05 mi (112.73 km) |
| Roermond to Olpe | 81.24 mi (130.75 km) |
| Roermond to Olsberg | 108.55 mi (174.69 km) |
| Roermond to Oranienburg | 326.69 mi (525.75 km) |
| Roermond to Ortenberg | 146.33 mi (235.49 km) |
