| Upper Montclair to Opole | 4,200.28 mi (6,759.69 km) |
| Upper Montclair to Orzesze | 4,249.35 mi (6,838.67 km) |
| Upper Montclair to Osowa | 4,093.14 mi (6,587.28 km) |
| Upper Montclair to Ostroda | 4,170.58 mi (6,711.90 km) |
| Upper Montclair to Ostroleka | 4,249.59 mi (6,839.06 km) |
| Upper Montclair to Ostrow Mazowiecka | 4,271.02 mi (6,873.54 km) |
| Upper Montclair to Ostrow Wielkopolski | 4,162.22 mi (6,698.45 km) |
| Upper Montclair to Ostrowiec Swietokrzyski | 4,320.61 mi (6,953.34 km) |
| Upper Montclair to Ostrzeszow | 4,174.52 mi (6,718.24 km) |
| Upper Montclair to Oswiecim | 4,271.25 mi (6,873.92 km) |
| Upper Montclair to Otwock | 4,272.83 mi (6,876.46 km) |
| Upper Montclair to Ozarow Mazowiecki | 4,252.33 mi (6,843.47 km) |
| Upper Montclair to Ozimek | 4,210.66 mi (6,776.40 km) |
| Upper Montclair to Ozorkow | 4,205.70 mi (6,768.42 km) |
| Upper Montclair to Pabianice | 4,220.42 mi (6,792.11 km) |
