| North Adams to Opole | 4,072.78 mi (6,554.50 km) |
| North Adams to Orzesze | 4,122.05 mi (6,633.79 km) |
| North Adams to Osowa | 3,962.10 mi (6,376.39 km) |
| North Adams to Ostroda | 4,039.73 mi (6,501.31 km) |
| North Adams to Ostroleka | 4,118.79 mi (6,628.56 km) |
| North Adams to Ostrow Mazowiecka | 4,140.33 mi (6,663.22 km) |
| North Adams to Ostrow Wielkopolski | 4,033.83 mi (6,491.82 km) |
| North Adams to Ostrowiec Swietokrzyski | 4,191.64 mi (6,745.79 km) |
| North Adams to Ostrzeszow | 4,046.30 mi (6,511.90 km) |
| North Adams to Oswiecim | 4,143.88 mi (6,668.93 km) |
| North Adams to Otwock | 4,142.90 mi (6,667.36 km) |
| North Adams to Ozarow Mazowiecki | 4,122.47 mi (6,634.47 km) |
| North Adams to Ozimek | 4,083.05 mi (6,571.04 km) |
| North Adams to Ozorkow | 4,076.53 mi (6,560.55 km) |
| North Adams to Pabianice | 4,091.51 mi (6,584.65 km) |
