| Ober-Ramstadt to Oestrich-Winkel | 35.30 mi (56.81 km) |
| Ober-Ramstadt to Offenburg | 101.38 mi (163.15 km) |
| Ober-Ramstadt to Oftersheim | 32.82 mi (52.81 km) |
| Ober-Ramstadt to Ohrdruf | 111.23 mi (179.00 km) |
| Ober-Ramstadt to Ohringen | 55.19 mi (88.83 km) |
| Ober-Ramstadt to Olbernhau | 210.48 mi (338.74 km) |
| Ober-Ramstadt to Olching | 162.04 mi (260.78 km) |
| Ober-Ramstadt to Oldenburg | 229.90 mi (369.99 km) |
| Ober-Ramstadt to Oldenburg in Holstein | 321.61 mi (517.58 km) |
| Ober-Ramstadt to Olfen | 143.17 mi (230.41 km) |
| Ober-Ramstadt to Olpe | 91.18 mi (146.74 km) |
| Ober-Ramstadt to Olsberg | 105.44 mi (169.70 km) |
| Ober-Ramstadt to Oranienburg | 279.75 mi (450.21 km) |
| Ober-Ramstadt to Ortenberg | 38.55 mi (62.05 km) |
| Ober-Ramstadt to Oschatz | 216.38 mi (348.22 km) |
