| Boortmeerbeek to Oestrich-Winkel | 165.48 mi (266.32 km) |
| Boortmeerbeek to Offenburg | 229.83 mi (369.88 km) |
| Boortmeerbeek to Oftersheim | 209.78 mi (337.61 km) |
| Boortmeerbeek to Ohrdruf | 268.79 mi (432.58 km) |
| Boortmeerbeek to Ohringen | 250.93 mi (403.83 km) |
| Boortmeerbeek to Olbernhau | 383.02 mi (616.41 km) |
| Boortmeerbeek to Olching | 358.09 mi (576.29 km) |
| Boortmeerbeek to Oldenburg | 215.09 mi (346.16 km) |
| Boortmeerbeek to Oldenburg in Holstein | 349.98 mi (563.23 km) |
| Boortmeerbeek to Olfen | 131.67 mi (211.91 km) |
| Boortmeerbeek to Olpe | 142.04 mi (228.60 km) |
| Boortmeerbeek to Olsberg | 171.55 mi (276.08 km) |
| Boortmeerbeek to Oranienburg | 389.32 mi (626.55 km) |
| Boortmeerbeek to Ortenberg | 201.25 mi (323.88 km) |
| Boortmeerbeek to Oschatz | 370.66 mi (596.52 km) |
