| Casselberry to Octeville | 4,293.72 mi (6,910.08 km) |
| Casselberry to Oignies | 4,479.49 mi (7,209.05 km) |
| Casselberry to Oissel | 4,417.67 mi (7,109.55 km) |
| Casselberry to Olivet | 4,479.96 mi (7,209.80 km) |
| Casselberry to Ollioules | 4,762.22 mi (7,664.04 km) |
| Casselberry to Olonne-sur-Mer | 4,336.72 mi (6,979.28 km) |
| Casselberry to Oloron-Sainte-Marie | 4,452.10 mi (7,164.96 km) |
| Casselberry to Onet Village | 4,581.19 mi (7,372.71 km) |
| Casselberry to Onnaing | 4,506.64 mi (7,252.73 km) |
| Casselberry to Orange | 4,690.22 mi (7,548.17 km) |
| Casselberry to Orchies | 4,490.02 mi (7,225.99 km) |
| Casselberry to Orleans | 4,479.61 mi (7,209.24 km) |
| Casselberry to Orly | 4,485.32 mi (7,218.42 km) |
| Casselberry to Ormesson-sur-Marne | 4,490.92 mi (7,227.43 km) |
| Casselberry to Orsay | 4,477.15 mi (7,205.28 km) |
