| Casper to Opwijk | 4,733.12 mi (7,617.21 km) |
| Casper to Ostend | 4,680.38 mi (7,532.35 km) |
| Casper to Oud-Heverlee | 4,754.86 mi (7,652.21 km) |
| Casper to Oud-Turnhout | 4,742.26 mi (7,631.93 km) |
| Casper to Oudenaarde | 4,719.73 mi (7,595.68 km) |
| Casper to Oudenburg | 4,684.94 mi (7,539.69 km) |
| Casper to Oupeye | 4,791.92 mi (7,711.86 km) |
| Casper to Overijse | 4,752.93 mi (7,649.10 km) |
| Casper to Overpelt | 4,760.68 mi (7,661.57 km) |
| Casper to Paal | 4,761.33 mi (7,662.61 km) |
| Casper to Peer | 4,765.81 mi (7,669.83 km) |
| Casper to Pepinster | 4,804.18 mi (7,731.57 km) |
| Casper to Peruwelz | 4,734.65 mi (7,619.68 km) |
| Casper to Perwez | 4,769.44 mi (7,675.68 km) |
| Casper to Philippeville | 4,780.84 mi (7,694.02 km) |
