| Casselberry to Opwijk | 4,520.41 mi (7,274.89 km) |
| Casselberry to Ostend | 4,462.78 mi (7,182.15 km) |
| Casselberry to Oud-Heverlee | 4,543.20 mi (7,311.57 km) |
| Casselberry to Oud-Turnhout | 4,547.04 mi (7,317.75 km) |
| Casselberry to Oudenaarde | 4,498.12 mi (7,239.03 km) |
| Casselberry to Oudenburg | 4,466.91 mi (7,188.79 km) |
| Casselberry to Oupeye | 4,586.55 mi (7,381.34 km) |
| Casselberry to Overijse | 4,538.57 mi (7,304.13 km) |
| Casselberry to Overpelt | 4,566.96 mi (7,349.81 km) |
| Casselberry to Paal | 4,560.32 mi (7,339.13 km) |
| Casselberry to Peer | 4,570.15 mi (7,354.95 km) |
| Casselberry to Pepinster | 4,596.70 mi (7,397.67 km) |
| Casselberry to Peruwelz | 4,503.60 mi (7,247.85 km) |
| Casselberry to Perwez | 4,553.49 mi (7,328.14 km) |
| Casselberry to Philippeville | 4,550.60 mi (7,323.49 km) |
