| Hackettstown to Octeville | 3,468.53 mi (5,582.05 km) |
| Hackettstown to Oignies | 3,640.65 mi (5,859.07 km) |
| Hackettstown to Oissel | 3,590.41 mi (5,778.21 km) |
| Hackettstown to Olivet | 3,663.07 mi (5,895.15 km) |
| Hackettstown to Ollioules | 3,975.52 mi (6,397.98 km) |
| Hackettstown to Olonne-sur-Mer | 3,538.41 mi (5,694.52 km) |
| Hackettstown to Oloron-Sainte-Marie | 3,682.28 mi (5,926.06 km) |
| Hackettstown to Onet Village | 3,792.42 mi (6,103.31 km) |
| Hackettstown to Onnaing | 3,667.44 mi (5,902.18 km) |
| Hackettstown to Orange | 3,897.80 mi (6,272.90 km) |
| Hackettstown to Orchies | 3,650.75 mi (5,875.32 km) |
| Hackettstown to Orleans | 3,662.40 mi (5,894.06 km) |
| Hackettstown to Orly | 3,660.51 mi (5,891.03 km) |
| Hackettstown to Ormesson-sur-Marne | 3,665.52 mi (5,899.09 km) |
| Hackettstown to Orsay | 3,653.07 mi (5,879.05 km) |
