| Clausthal-Zellerfeld to Opwijk | 271.44 mi (436.84 km) |
| Clausthal-Zellerfeld to Ostend | 321.23 mi (516.97 km) |
| Clausthal-Zellerfeld to Oud-Heverlee | 253.76 mi (408.39 km) |
| Clausthal-Zellerfeld to Oud-Turnhout | 232.31 mi (373.87 km) |
| Clausthal-Zellerfeld to Oudenaarde | 298.08 mi (479.71 km) |
| Clausthal-Zellerfeld to Oudenburg | 318.33 mi (512.30 km) |
| Clausthal-Zellerfeld to Oupeye | 216.55 mi (348.50 km) |
| Clausthal-Zellerfeld to Overijse | 260.36 mi (419.01 km) |
| Clausthal-Zellerfeld to Overpelt | 215.35 mi (346.56 km) |
| Clausthal-Zellerfeld to Paal | 228.59 mi (367.88 km) |
| Clausthal-Zellerfeld to Peer | 215.15 mi (346.25 km) |
| Clausthal-Zellerfeld to Pepinster | 213.54 mi (343.66 km) |
| Clausthal-Zellerfeld to Peruwelz | 305.69 mi (491.96 km) |
| Clausthal-Zellerfeld to Perwez | 252.41 mi (406.21 km) |
| Clausthal-Zellerfeld to Philippeville | 274.81 mi (442.27 km) |
