| Southborough to Oerlinghausen | 364.93 mi (587.30 km) |
| Southborough to Oestrich-Winkel | 348.51 mi (560.88 km) |
| Southborough to Offenburg | 388.96 mi (625.97 km) |
| Southborough to Oftersheim | 387.43 mi (623.50 km) |
| Southborough to Ohrdruf | 455.40 mi (732.90 km) |
| Southborough to Ohringen | 430.11 mi (692.19 km) |
| Southborough to Olbernhau | 569.55 mi (916.61 km) |
| Southborough to Olching | 534.06 mi (859.48 km) |
| Southborough to Oldenburg | 363.54 mi (585.07 km) |
| Southborough to Oldenburg in Holstein | 493.75 mi (794.61 km) |
| Southborough to Olfen | 308.85 mi (497.05 km) |
| Southborough to Olpe | 328.45 mi (528.59 km) |
| Southborough to Olsberg | 355.43 mi (572.01 km) |
| Southborough to Oranienburg | 562.38 mi (905.06 km) |
| Southborough to Ortenberg | 387.96 mi (624.35 km) |
