| Somain to Orzesze | 682.33 mi (1,098.11 km) |
| Somain to Osowa | 697.67 mi (1,122.80 km) |
| Somain to Ostroda | 743.95 mi (1,197.27 km) |
| Somain to Ostroleka | 802.52 mi (1,291.53 km) |
| Somain to Ostrow Mazowiecka | 814.63 mi (1,311.03 km) |
| Somain to Ostrow Wielkopolski | 637.19 mi (1,025.46 km) |
| Somain to Ostrowiec Swietokrzyski | 792.88 mi (1,276.02 km) |
| Somain to Ostrzeszow | 641.77 mi (1,032.84 km) |
| Somain to Oswiecim | 704.06 mi (1,133.07 km) |
| Somain to Otwock | 785.42 mi (1,264.01 km) |
| Somain to Ozarow Mazowiecki | 765.92 mi (1,232.64 km) |
| Somain to Ozimek | 655.32 mi (1,054.63 km) |
| Somain to Ozorkow | 700.78 mi (1,127.80 km) |
| Somain to Pabianice | 704.34 mi (1,133.52 km) |
| Somain to Parczew | 853.69 mi (1,373.88 km) |
