| Hackettstown to Olivares | 3,591.58 mi (5,780.09 km) |
| Hackettstown to Olivenza | 3,506.68 mi (5,643.46 km) |
| Hackettstown to Olot | 3,854.25 mi (6,202.81 km) |
| Hackettstown to Onate | 3,603.76 mi (5,799.69 km) |
| Hackettstown to Onda | 3,795.83 mi (6,108.80 km) |
| Hackettstown to Onteniente | 3,815.71 mi (6,140.78 km) |
| Hackettstown to Orihuela | 3,823.16 mi (6,152.78 km) |
| Hackettstown to Osuna | 3,648.78 mi (5,872.15 km) |
| Hackettstown to Ourense | 3,368.28 mi (5,420.72 km) |
| Hackettstown to Oviedo | 3,436.14 mi (5,529.94 km) |
| Hackettstown to Paiporta | 3,805.40 mi (6,124.19 km) |
| Hackettstown to Pajara | 3,488.99 mi (5,614.98 km) |
| Hackettstown to Palafolls | 3,882.34 mi (6,248.02 km) |
| Hackettstown to Palafrugell | 3,893.37 mi (6,265.78 km) |
| Hackettstown to Palamos | 3,894.08 mi (6,266.91 km) |
