| Southborough to Opole | 768.58 mi (1,236.90 km) |
| Southborough to Orzesze | 810.56 mi (1,304.47 km) |
| Southborough to Osowa | 790.86 mi (1,272.77 km) |
| Southborough to Ostroda | 845.42 mi (1,360.57 km) |
| Southborough to Ostroleka | 909.92 mi (1,464.37 km) |
| Southborough to Ostrow Mazowiecka | 924.10 mi (1,487.19 km) |
| Southborough to Ostrow Wielkopolski | 755.42 mi (1,215.73 km) |
| Southborough to Ostrowiec Swietokrzyski | 915.03 mi (1,472.59 km) |
| Southborough to Ostrzeszow | 761.81 mi (1,226.02 km) |
| Southborough to Oswiecim | 832.62 mi (1,339.98 km) |
| Southborough to Otwock | 899.82 mi (1,448.13 km) |
| Southborough to Ozarow Mazowiecki | 879.64 mi (1,415.64 km) |
| Southborough to Ozimek | 780.59 mi (1,256.24 km) |
| Southborough to Ozorkow | 816.42 mi (1,313.90 km) |
| Southborough to Pabianice | 822.35 mi (1,323.45 km) |
