| Calhoun to Opwijk | 4,380.21 mi (7,049.27 km) |
| Calhoun to Ostend | 4,322.68 mi (6,956.69 km) |
| Calhoun to Oud-Heverlee | 4,403.20 mi (7,086.27 km) |
| Calhoun to Oud-Turnhout | 4,402.68 mi (7,085.43 km) |
| Calhoun to Oudenaarde | 4,359.87 mi (7,016.53 km) |
| Calhoun to Oudenburg | 4,327.02 mi (6,963.66 km) |
| Calhoun to Oupeye | 4,445.77 mi (7,154.77 km) |
| Calhoun to Overijse | 4,399.21 mi (7,079.84 km) |
| Calhoun to Overpelt | 4,422.62 mi (7,117.53 km) |
| Calhoun to Paal | 4,417.81 mi (7,109.78 km) |
| Calhoun to Peer | 4,426.41 mi (7,123.61 km) |
| Calhoun to Pepinster | 4,456.69 mi (7,172.36 km) |
| Calhoun to Peruwelz | 4,368.03 mi (7,029.67 km) |
| Calhoun to Perwez | 4,414.88 mi (7,105.06 km) |
| Calhoun to Philippeville | 4,415.81 mi (7,106.56 km) |
