| Hagerstown to Octeville | 3,640.97 mi (5,859.57 km) |
| Hagerstown to Oignies | 3,811.94 mi (6,134.73 km) |
| Hagerstown to Oissel | 3,762.65 mi (6,055.40 km) |
| Hagerstown to Olivet | 3,835.92 mi (6,173.31 km) |
| Hagerstown to Ollioules | 4,149.41 mi (6,677.83 km) |
| Hagerstown to Olonne-sur-Mer | 3,712.10 mi (5,974.04 km) |
| Hagerstown to Oloron-Sainte-Marie | 3,856.48 mi (6,206.40 km) |
| Hagerstown to Onet Village | 3,966.30 mi (6,383.15 km) |
| Hagerstown to Onnaing | 3,838.69 mi (6,177.77 km) |
| Hagerstown to Orange | 4,071.56 mi (6,552.55 km) |
| Hagerstown to Orchies | 3,822.00 mi (6,150.91 km) |
| Hagerstown to Orleans | 3,835.22 mi (6,172.20 km) |
| Hagerstown to Orly | 3,832.88 mi (6,168.42 km) |
| Hagerstown to Ormesson-sur-Marne | 3,837.85 mi (6,176.42 km) |
| Hagerstown to Orsay | 3,825.49 mi (6,156.53 km) |
