| Dormagen to Oestrich-Winkel | 92.06 mi (148.15 km) |
| Dormagen to Offenburg | 188.63 mi (303.58 km) |
| Dormagen to Oftersheim | 142.76 mi (229.75 km) |
| Dormagen to Ohrdruf | 171.42 mi (275.88 km) |
| Dormagen to Ohringen | 177.03 mi (284.90 km) |
| Dormagen to Olbernhau | 285.54 mi (459.54 km) |
| Dormagen to Olching | 283.93 mi (456.94 km) |
| Dormagen to Oldenburg | 153.15 mi (246.47 km) |
| Dormagen to Oldenburg in Holstein | 278.96 mi (448.95 km) |
| Dormagen to Olfen | 49.11 mi (79.04 km) |
| Dormagen to Olpe | 44.52 mi (71.65 km) |
| Dormagen to Olsberg | 74.15 mi (119.34 km) |
| Dormagen to Oranienburg | 296.34 mi (476.91 km) |
| Dormagen to Ortenberg | 110.58 mi (177.97 km) |
| Dormagen to Oschatz | 272.61 mi (438.72 km) |
