| Clausthal-Zellerfeld to Novi di Modena | 478.25 mi (769.66 km) |
| Clausthal-Zellerfeld to Novi Ligure | 491.98 mi (791.76 km) |
| Clausthal-Zellerfeld to Nuoro | 795.20 mi (1,279.75 km) |
| Clausthal-Zellerfeld to Occhiobello | 479.00 mi (770.88 km) |
| Clausthal-Zellerfeld to Oderzo | 427.60 mi (688.16 km) |
| Clausthal-Zellerfeld to Oggiono | 418.46 mi (673.45 km) |
| Clausthal-Zellerfeld to Olbia | 753.35 mi (1,212.40 km) |
| Clausthal-Zellerfeld to Oleggio | 435.66 mi (701.13 km) |
| Clausthal-Zellerfeld to Olgiate Comasco | 420.68 mi (677.02 km) |
| Clausthal-Zellerfeld to Olgiate Olona | 431.51 mi (694.44 km) |
| Clausthal-Zellerfeld to Omegna | 418.75 mi (673.92 km) |
| Clausthal-Zellerfeld to Opera | 446.62 mi (718.76 km) |
| Clausthal-Zellerfeld to Oppeano | 451.11 mi (726.00 km) |
| Clausthal-Zellerfeld to Orbassano | 486.80 mi (783.44 km) |
| Clausthal-Zellerfeld to Orbetello | 648.40 mi (1,043.50 km) |
