| Cologne to Oestrich-Winkel | 79.41 mi (127.81 km) |
| Cologne to Offenburg | 176.17 mi (283.52 km) |
| Cologne to Oftersheim | 130.08 mi (209.35 km) |
| Cologne to Ohrdruf | 164.93 mi (265.43 km) |
| Cologne to Ohringen | 164.77 mi (265.17 km) |
| Cologne to Olbernhau | 279.16 mi (449.26 km) |
| Cologne to Olching | 271.91 mi (437.60 km) |
| Cologne to Oldenburg | 161.66 mi (260.17 km) |
| Cologne to Oldenburg in Holstein | 284.85 mi (458.42 km) |
| Cologne to Olfen | 57.03 mi (91.78 km) |
| Cologne to Olpe | 38.70 mi (62.29 km) |
| Cologne to Olsberg | 72.23 mi (116.25 km) |
| Cologne to Oranienburg | 296.06 mi (476.45 km) |
| Cologne to Ortenberg | 100.47 mi (161.69 km) |
| Cologne to Oschatz | 268.02 mi (431.34 km) |
