| Darmstadt to Obernburg am Main | 21.88 mi (35.21 km) |
| Darmstadt to Obernkirchen | 166.65 mi (268.20 km) |
| Darmstadt to Oberschleissheim | 173.08 mi (278.55 km) |
| Darmstadt to Oberstdorf | 185.63 mi (298.74 km) |
| Darmstadt to Obertraubling | 169.89 mi (273.41 km) |
| Darmstadt to Obertshausen | 15.65 mi (25.19 km) |
| Darmstadt to Oberursel | 23.12 mi (37.21 km) |
| Darmstadt to Ochsenfurt | 64.95 mi (104.52 km) |
| Darmstadt to Ochsenhausen | 137.54 mi (221.35 km) |
| Darmstadt to Ochtrup | 173.28 mi (278.87 km) |
| Darmstadt to Odenthal | 104.89 mi (168.80 km) |
| Darmstadt to Oelde | 137.26 mi (220.90 km) |
| Darmstadt to Oelsnitz | 160.06 mi (257.59 km) |
| Darmstadt to Oer-Erkenschwick | 136.78 mi (220.13 km) |
| Darmstadt to Oerlinghausen | 144.72 mi (232.90 km) |
