| Delaware to Octeville | 3,835.54 mi (6,172.70 km) |
| Delaware to Oignies | 3,997.68 mi (6,433.65 km) |
| Delaware to Oissel | 3,955.30 mi (6,365.44 km) |
| Delaware to Olivet | 4,033.53 mi (6,491.35 km) |
| Delaware to Ollioules | 4,359.03 mi (7,015.18 km) |
| Delaware to Olonne-sur-Mer | 3,919.29 mi (6,307.49 km) |
| Delaware to Oloron-Sainte-Marie | 4,074.47 mi (6,557.23 km) |
| Delaware to Onet Village | 4,176.09 mi (6,720.77 km) |
| Delaware to Onnaing | 4,024.04 mi (6,476.06 km) |
| Delaware to Orange | 4,279.19 mi (6,886.68 km) |
| Delaware to Orchies | 4,007.41 mi (6,449.31 km) |
| Delaware to Orleans | 4,032.68 mi (6,489.97 km) |
| Delaware to Orly | 4,026.40 mi (6,479.87 km) |
| Delaware to Ormesson-sur-Marne | 4,031.03 mi (6,487.31 km) |
| Delaware to Orsay | 4,019.45 mi (6,468.68 km) |
