| Hackettstown to Opole | 4,223.43 mi (6,796.96 km) |
| Hackettstown to Orzesze | 4,272.59 mi (6,876.07 km) |
| Hackettstown to Osowa | 4,114.65 mi (6,621.89 km) |
| Hackettstown to Ostroda | 4,192.18 mi (6,746.67 km) |
| Hackettstown to Ostroleka | 4,271.23 mi (6,873.88 km) |
| Hackettstown to Ostrow Mazowiecka | 4,292.71 mi (6,908.45 km) |
| Hackettstown to Ostrow Wielkopolski | 4,185.00 mi (6,735.10 km) |
| Hackettstown to Ostrowiec Swietokrzyski | 4,343.13 mi (6,989.59 km) |
| Hackettstown to Ostrzeszow | 4,197.37 mi (6,755.02 km) |
| Hackettstown to Oswiecim | 4,294.46 mi (6,911.27 km) |
| Hackettstown to Otwock | 4,294.90 mi (6,911.98 km) |
| Hackettstown to Ozarow Mazowiecki | 4,274.44 mi (6,879.04 km) |
| Hackettstown to Ozimek | 4,233.77 mi (6,813.59 km) |
| Hackettstown to Ozorkow | 4,228.13 mi (6,804.52 km) |
| Hackettstown to Pabianice | 4,242.97 mi (6,828.40 km) |
