| Cologne to Novi di Modena | 455.64 mi (733.28 km) |
| Cologne to Novi Ligure | 435.14 mi (700.30 km) |
| Cologne to Nuoro | 742.60 mi (1,195.11 km) |
| Cologne to Occhiobello | 467.35 mi (752.12 km) |
| Cologne to Oderzo | 437.43 mi (703.97 km) |
| Cologne to Oggiono | 372.61 mi (599.66 km) |
| Cologne to Olbia | 702.92 mi (1,131.24 km) |
| Cologne to Oleggio | 376.70 mi (606.23 km) |
| Cologne to Olgiate Comasco | 367.81 mi (591.94 km) |
| Cologne to Olgiate Olona | 376.97 mi (606.67 km) |
| Cologne to Omegna | 355.78 mi (572.58 km) |
| Cologne to Opera | 397.56 mi (639.82 km) |
| Cologne to Oppeano | 435.41 mi (700.73 km) |
| Cologne to Orbassano | 410.55 mi (660.71 km) |
| Cologne to Orbetello | 620.56 mi (998.69 km) |
