| Severn to Opole | 4,377.21 mi (7,044.43 km) |
| Severn to Orzesze | 4,426.31 mi (7,123.45 km) |
| Severn to Osowa | 4,269.13 mi (6,870.51 km) |
| Severn to Ostroda | 4,346.65 mi (6,995.26 km) |
| Severn to Ostroleka | 4,425.68 mi (7,122.45 km) |
| Severn to Ostrow Mazowiecka | 4,447.16 mi (7,157.01 km) |
| Severn to Ostrow Wielkopolski | 4,339.00 mi (6,982.95 km) |
| Severn to Ostrowiec Swietokrzyski | 4,497.27 mi (7,237.65 km) |
| Severn to Ostrzeszow | 4,351.33 mi (7,002.80 km) |
| Severn to Oswiecim | 4,448.20 mi (7,158.69 km) |
| Severn to Otwock | 4,449.23 mi (7,160.35 km) |
| Severn to Ozarow Mazowiecki | 4,428.75 mi (7,127.39 km) |
| Severn to Ozimek | 4,387.57 mi (7,061.12 km) |
| Severn to Ozorkow | 4,382.31 mi (7,052.65 km) |
| Severn to Pabianice | 4,397.10 mi (7,076.44 km) |
