| Boppard to Oestrich-Winkel | 24.17 mi (38.90 km) |
| Boppard to Offenburg | 122.90 mi (197.79 km) |
| Boppard to Oftersheim | 74.17 mi (119.37 km) |
| Boppard to Ohrdruf | 144.01 mi (231.77 km) |
| Boppard to Ohringen | 111.14 mi (178.86 km) |
| Boppard to Olbernhau | 254.37 mi (409.36 km) |
| Boppard to Olching | 218.99 mi (352.43 km) |
| Boppard to Oldenburg | 202.99 mi (326.69 km) |
| Boppard to Oldenburg in Holstein | 313.62 mi (504.72 km) |
| Boppard to Olfen | 103.02 mi (165.80 km) |
| Boppard to Olpe | 55.29 mi (88.98 km) |
| Boppard to Olsberg | 86.56 mi (139.31 km) |
| Boppard to Oranienburg | 298.83 mi (480.92 km) |
| Boppard to Ortenberg | 65.21 mi (104.95 km) |
| Boppard to Oschatz | 252.06 mi (405.65 km) |
