| Bad Ems to Oestrich-Winkel | 26.64 mi (42.87 km) |
| Bad Ems to Offenburg | 129.69 mi (208.71 km) |
| Bad Ems to Oftersheim | 77.36 mi (124.50 km) |
| Bad Ems to Ohrdruf | 136.83 mi (220.21 km) |
| Bad Ems to Ohringen | 112.06 mi (180.35 km) |
| Bad Ems to Olbernhau | 248.08 mi (399.24 km) |
| Bad Ems to Olching | 219.62 mi (353.45 km) |
| Bad Ems to Oldenburg | 195.05 mi (313.91 km) |
| Bad Ems to Oldenburg in Holstein | 304.70 mi (490.37 km) |
| Bad Ems to Olfen | 96.31 mi (154.99 km) |
| Bad Ems to Olpe | 47.19 mi (75.95 km) |
| Bad Ems to Olsberg | 77.62 mi (124.91 km) |
| Bad Ems to Oranienburg | 290.14 mi (466.94 km) |
| Bad Ems to Ortenberg | 59.30 mi (95.44 km) |
| Bad Ems to Oschatz | 244.70 mi (393.81 km) |
