| Herndon to Octeville | 3,655.30 mi (5,882.64 km) |
| Herndon to Oignies | 3,828.15 mi (6,160.82 km) |
| Herndon to Oissel | 3,777.35 mi (6,079.06 km) |
| Herndon to Olivet | 3,849.44 mi (6,195.07 km) |
| Herndon to Ollioules | 4,159.86 mi (6,694.65 km) |
| Herndon to Olonne-sur-Mer | 3,723.38 mi (5,992.20 km) |
| Herndon to Oloron-Sainte-Marie | 3,864.90 mi (6,219.96 km) |
| Herndon to Onet Village | 3,976.80 mi (6,400.04 km) |
| Herndon to Onnaing | 3,854.96 mi (6,203.97 km) |
| Herndon to Orange | 4,082.55 mi (6,570.23 km) |
| Herndon to Orchies | 3,838.27 mi (6,177.10 km) |
| Herndon to Orleans | 3,848.78 mi (6,194.01 km) |
| Herndon to Orly | 3,847.34 mi (6,191.70 km) |
| Herndon to Ormesson-sur-Marne | 3,852.39 mi (6,199.82 km) |
| Herndon to Orsay | 3,839.86 mi (6,179.66 km) |
