| Oldenzaal to Oerlinghausen | 77.38 mi (124.52 km) |
| Oldenzaal to Oestrich-Winkel | 166.60 mi (268.12 km) |
| Oldenzaal to Offenburg | 269.62 mi (433.92 km) |
| Oldenzaal to Oftersheim | 215.91 mi (347.48 km) |
| Oldenzaal to Ohrdruf | 192.84 mi (310.34 km) |
| Oldenzaal to Ohringen | 242.78 mi (390.71 km) |
| Oldenzaal to Olbernhau | 297.86 mi (479.36 km) |
| Oldenzaal to Olching | 343.95 mi (553.53 km) |
| Oldenzaal to Oldenburg | 78.34 mi (126.08 km) |
| Oldenzaal to Oldenburg in Holstein | 212.95 mi (342.70 km) |
| Oldenzaal to Olfen | 45.66 mi (73.48 km) |
| Oldenzaal to Olpe | 97.75 mi (157.31 km) |
| Oldenzaal to Olsberg | 94.02 mi (151.31 km) |
| Oldenzaal to Oranienburg | 266.56 mi (428.98 km) |
| Oldenzaal to Ortenberg | 163.53 mi (263.17 km) |
