| Mannheim to Obernburg am Main | 38.78 mi (62.42 km) |
| Mannheim to Obernkirchen | 194.07 mi (312.33 km) |
| Mannheim to Oberschleissheim | 164.82 mi (265.25 km) |
| Mannheim to Oberstdorf | 165.88 mi (266.96 km) |
| Mannheim to Obertraubling | 170.82 mi (274.91 km) |
| Mannheim to Obertshausen | 43.22 mi (69.56 km) |
| Mannheim to Oberursel | 49.68 mi (79.96 km) |
| Mannheim to Ochsenfurt | 72.59 mi (116.82 km) |
| Mannheim to Ochsenhausen | 118.82 mi (191.22 km) |
| Mannheim to Ochtrup | 195.85 mi (315.19 km) |
| Mannheim to Odenthal | 122.29 mi (196.80 km) |
| Mannheim to Oelde | 162.65 mi (261.76 km) |
| Mannheim to Oelsnitz | 176.57 mi (284.16 km) |
| Mannheim to Oer-Erkenschwick | 158.12 mi (254.46 km) |
| Mannheim to Oerlinghausen | 171.50 mi (276.00 km) |
