| Adra to Opwijk | 1,044.63 mi (1,681.16 km) |
| Adra to Ostend | 1,042.08 mi (1,677.06 km) |
| Adra to Oud-Heverlee | 1,044.55 mi (1,681.04 km) |
| Adra to Oud-Turnhout | 1,080.65 mi (1,739.13 km) |
| Adra to Oudenaarde | 1,027.68 mi (1,653.89 km) |
| Adra to Oudenburg | 1,040.42 mi (1,674.39 km) |
| Adra to Oupeye | 1,055.31 mi (1,698.36 km) |
| Adra to Overijse | 1,039.02 mi (1,672.14 km) |
| Adra to Overpelt | 1,082.34 mi (1,741.86 km) |
| Adra to Paal | 1,066.71 mi (1,716.71 km) |
| Adra to Peer | 1,077.83 mi (1,734.60 km) |
| Adra to Pepinster | 1,050.17 mi (1,690.09 km) |
| Adra to Peruwelz | 1,005.95 mi (1,618.93 km) |
| Adra to Perwez | 1,034.11 mi (1,664.25 km) |
| Adra to Philippeville | 1,002.62 mi (1,613.57 km) |
