| Heerlerbaan to Oerlinghausen | 137.29 mi (220.94 km) |
| Heerlerbaan to Oestrich-Winkel | 106.18 mi (170.87 km) |
| Heerlerbaan to Offenburg | 186.93 mi (300.84 km) |
| Heerlerbaan to Oftersheim | 154.02 mi (247.88 km) |
| Heerlerbaan to Ohrdruf | 206.00 mi (331.52 km) |
| Heerlerbaan to Ohringen | 193.06 mi (310.71 km) |
| Heerlerbaan to Olbernhau | 320.18 mi (515.28 km) |
| Heerlerbaan to Olching | 300.92 mi (484.28 km) |
| Heerlerbaan to Oldenburg | 182.97 mi (294.46 km) |
| Heerlerbaan to Oldenburg in Holstein | 312.96 mi (503.67 km) |
| Heerlerbaan to Olfen | 83.35 mi (134.14 km) |
| Heerlerbaan to Olpe | 80.01 mi (128.77 km) |
| Heerlerbaan to Olsberg | 112.30 mi (180.72 km) |
| Heerlerbaan to Oranienburg | 334.86 mi (538.91 km) |
| Heerlerbaan to Ortenberg | 138.13 mi (222.29 km) |
