| Aachen to Obernburg am Main | 149.60 mi (240.76 km) |
| Aachen to Obernkirchen | 166.19 mi (267.45 km) |
| Aachen to Oberschleissheim | 301.46 mi (485.15 km) |
| Aachen to Oberstdorf | 300.10 mi (482.96 km) |
| Aachen to Obertraubling | 298.25 mi (479.98 km) |
| Aachen to Obertshausen | 130.57 mi (210.13 km) |
| Aachen to Oberursel | 116.51 mi (187.50 km) |
| Aachen to Ochsenfurt | 192.49 mi (309.78 km) |
| Aachen to Ochsenhausen | 254.99 mi (410.36 km) |
| Aachen to Ochtrup | 109.67 mi (176.50 km) |
| Aachen to Odenthal | 48.41 mi (77.90 km) |
| Aachen to Oelde | 115.35 mi (185.64 km) |
| Aachen to Oelsnitz | 267.87 mi (431.10 km) |
| Aachen to Oer-Erkenschwick | 78.34 mi (126.08 km) |
| Aachen to Oerlinghausen | 138.50 mi (222.90 km) |
