| Norristown to Opole | 4,277.95 mi (6,884.70 km) |
| Norristown to Orzesze | 4,327.05 mi (6,963.71 km) |
| Norristown to Osowa | 4,170.25 mi (6,711.38 km) |
| Norristown to Ostroda | 4,247.73 mi (6,836.07 km) |
| Norristown to Ostroleka | 4,326.76 mi (6,963.25 km) |
| Norristown to Ostrow Mazowiecka | 4,348.21 mi (6,997.77 km) |
| Norristown to Ostrow Wielkopolski | 4,239.80 mi (6,823.30 km) |
| Norristown to Ostrowiec Swietokrzyski | 4,398.11 mi (7,078.07 km) |
| Norristown to Ostrzeszow | 4,252.12 mi (6,843.12 km) |
| Norristown to Oswiecim | 4,348.94 mi (6,998.95 km) |
| Norristown to Otwock | 4,350.18 mi (7,000.93 km) |
| Norristown to Ozarow Mazowiecki | 4,329.69 mi (6,967.96 km) |
| Norristown to Ozimek | 4,288.33 mi (6,901.39 km) |
| Norristown to Ozorkow | 4,283.17 mi (6,893.09 km) |
| Norristown to Pabianice | 4,297.93 mi (6,916.85 km) |
