| Longmont to Opwijk | 4,836.09 mi (7,782.93 km) |
| Longmont to Ostend | 4,782.36 mi (7,696.46 km) |
| Longmont to Oud-Heverlee | 4,858.15 mi (7,818.43 km) |
| Longmont to Oud-Turnhout | 4,847.06 mi (7,800.60 km) |
| Longmont to Oudenaarde | 4,821.68 mi (7,759.75 km) |
| Longmont to Oudenburg | 4,786.92 mi (7,703.80 km) |
| Longmont to Oupeye | 4,896.19 mi (7,879.65 km) |
| Longmont to Overijse | 4,855.92 mi (7,814.85 km) |
| Longmont to Overpelt | 4,865.81 mi (7,830.76 km) |
| Longmont to Paal | 4,865.74 mi (7,830.65 km) |
| Longmont to Peer | 4,870.79 mi (7,838.79 km) |
| Longmont to Pepinster | 4,908.34 mi (7,899.22 km) |
| Longmont to Peruwelz | 4,835.79 mi (7,782.45 km) |
| Longmont to Perwez | 4,872.44 mi (7,841.43 km) |
| Longmont to Philippeville | 4,882.51 mi (7,857.64 km) |
