| Ahlen to Obernburg am Main | 143.66 mi (231.20 km) |
| Ahlen to Obernkirchen | 62.68 mi (100.88 km) |
| Ahlen to Oberschleissheim | 292.43 mi (470.62 km) |
| Ahlen to Oberstdorf | 319.21 mi (513.72 km) |
| Ahlen to Obertraubling | 269.87 mi (434.31 km) |
| Ahlen to Obertshausen | 124.20 mi (199.88 km) |
| Ahlen to Oberursel | 111.84 mi (179.98 km) |
| Ahlen to Ochsenfurt | 174.29 mi (280.49 km) |
| Ahlen to Ochsenhausen | 270.92 mi (436.01 km) |
| Ahlen to Ochtrup | 42.70 mi (68.72 km) |
| Ahlen to Odenthal | 60.48 mi (97.34 km) |
| Ahlen to Oelde | 12.07 mi (19.43 km) |
| Ahlen to Oelsnitz | 207.53 mi (333.98 km) |
| Ahlen to Oer-Erkenschwick | 28.67 mi (46.13 km) |
| Ahlen to Oerlinghausen | 35.95 mi (57.86 km) |
