| Adrian to Opwijk | 3,991.85 mi (6,424.27 km) |
| Adrian to Ostend | 3,935.02 mi (6,332.81 km) |
| Adrian to Oud-Heverlee | 4,014.76 mi (6,461.13 km) |
| Adrian to Oud-Turnhout | 4,010.75 mi (6,454.68 km) |
| Adrian to Oudenaarde | 3,973.30 mi (6,394.40 km) |
| Adrian to Oudenburg | 3,939.48 mi (6,339.97 km) |
| Adrian to Oupeye | 4,056.24 mi (6,527.89 km) |
| Adrian to Overijse | 4,011.32 mi (6,455.59 km) |
| Adrian to Overpelt | 4,030.49 mi (6,486.45 km) |
| Adrian to Paal | 4,027.19 mi (6,481.13 km) |
| Adrian to Peer | 4,034.71 mi (6,493.23 km) |
| Adrian to Pepinster | 4,067.68 mi (6,546.30 km) |
| Adrian to Peruwelz | 3,983.55 mi (6,410.90 km) |
| Adrian to Perwez | 4,027.42 mi (6,481.51 km) |
| Adrian to Philippeville | 4,031.43 mi (6,487.97 km) |
