| Round Lake to Opwijk | 4,124.42 mi (6,637.61 km) |
| Round Lake to Ostend | 4,068.14 mi (6,547.03 km) |
| Round Lake to Oud-Heverlee | 4,147.20 mi (6,674.28 km) |
| Round Lake to Oud-Turnhout | 4,141.46 mi (6,665.04 km) |
| Round Lake to Oudenaarde | 4,106.81 mi (6,609.27 km) |
| Round Lake to Oudenburg | 4,072.63 mi (6,554.27 km) |
| Round Lake to Oupeye | 4,188.00 mi (6,739.93 km) |
| Round Lake to Overijse | 4,144.04 mi (6,669.19 km) |
| Round Lake to Overpelt | 4,161.04 mi (6,696.54 km) |
| Round Lake to Paal | 4,158.50 mi (6,692.46 km) |
| Round Lake to Peer | 4,165.45 mi (6,703.65 km) |
| Round Lake to Pepinster | 4,199.65 mi (6,758.69 km) |
| Round Lake to Peruwelz | 4,118.04 mi (6,627.34 km) |
| Round Lake to Perwez | 4,160.31 mi (6,695.37 km) |
| Round Lake to Philippeville | 4,165.81 mi (6,704.22 km) |
