| Southborough to Sierpc | 830.84 mi (1,337.11 km) |
| Southborough to Skarzysko-Kamienna | 892.34 mi (1,436.08 km) |
| Southborough to Skawina | 859.96 mi (1,383.97 km) |
| Southborough to Skierniewice | 853.23 mi (1,373.14 km) |
| Southborough to Skoczow | 817.60 mi (1,315.80 km) |
| Southborough to Skwierzyna | 656.10 mi (1,055.89 km) |
| Southborough to Slawno | 718.91 mi (1,156.98 km) |
| Southborough to Slubice | 616.15 mi (991.60 km) |
| Southborough to Slupca | 755.46 mi (1,215.79 km) |
| Southborough to Slupsk | 734.33 mi (1,181.79 km) |
| Southborough to Sochaczew | 855.62 mi (1,376.99 km) |
| Southborough to Sokolka | 989.74 mi (1,592.84 km) |
| Southborough to Sokolow Podlaski | 940.01 mi (1,512.81 km) |
| Southborough to Solec Kujawski | 771.62 mi (1,241.80 km) |
| Southborough to Sopot | 794.91 mi (1,279.29 km) |
