| Adra to Oerlinghausen | 1,196.09 mi (1,924.92 km) |
| Adra to Oestrich-Winkel | 1,067.24 mi (1,717.56 km) |
| Adra to Offenburg | 980.50 mi (1,577.97 km) |
| Adra to Oftersheim | 1,047.87 mi (1,686.39 km) |
| Adra to Ohrdruf | 1,186.06 mi (1,908.78 km) |
| Adra to Ohringen | 1,064.96 mi (1,713.88 km) |
| Adra to Olbernhau | 1,255.87 mi (2,021.13 km) |
| Adra to Olching | 1,073.36 mi (1,727.41 km) |
| Adra to Oldenburg | 1,255.48 mi (2,020.50 km) |
| Adra to Oldenburg in Holstein | 1,381.19 mi (2,222.80 km) |
| Adra to Olfen | 1,152.63 mi (1,854.98 km) |
| Adra to Olpe | 1,121.50 mi (1,804.88 km) |
| Adra to Olsberg | 1,156.18 mi (1,860.69 km) |
| Adra to Oranienburg | 1,356.69 mi (2,183.38 km) |
| Adra to Ortenberg | 1,114.62 mi (1,793.81 km) |
