| Cay to Opwijk | 1,556.19 mi (2,504.44 km) |
| Cay to Ostend | 1,613.72 mi (2,597.03 km) |
| Cay to Oud-Heverlee | 1,533.20 mi (2,467.44 km) |
| Cay to Oud-Turnhout | 1,534.23 mi (2,469.10 km) |
| Cay to Oudenaarde | 1,576.63 mi (2,537.34 km) |
| Cay to Oudenburg | 1,609.39 mi (2,590.07 km) |
| Cay to Oupeye | 1,490.67 mi (2,399.01 km) |
| Cay to Overijse | 1,537.20 mi (2,473.89 km) |
| Cay to Overpelt | 1,514.32 mi (2,437.07 km) |
| Cay to Paal | 1,518.79 mi (2,444.25 km) |
| Cay to Peer | 1,510.42 mi (2,430.78 km) |
| Cay to Pepinster | 1,479.71 mi (2,381.37 km) |
| Cay to Peruwelz | 1,568.89 mi (2,524.88 km) |
| Cay to Perwez | 1,521.56 mi (2,448.71 km) |
| Cay to Philippeville | 1,521.24 mi (2,448.19 km) |
