| Boston to Oerlinghausen | 372.00 mi (598.67 km) |
| Boston to Oestrich-Winkel | 401.31 mi (645.85 km) |
| Boston to Offenburg | 466.48 mi (750.73 km) |
| Boston to Oftersheim | 447.84 mi (720.73 km) |
| Boston to Ohrdruf | 481.30 mi (774.59 km) |
| Boston to Ohringen | 488.03 mi (785.40 km) |
| Boston to Olbernhau | 591.23 mi (951.50 km) |
| Boston to Olching | 595.76 mi (958.78 km) |
| Boston to Oldenburg | 341.98 mi (550.36 km) |
| Boston to Oldenburg in Holstein | 455.52 mi (733.09 km) |
| Boston to Olfen | 324.23 mi (521.79 km) |
| Boston to Olpe | 360.25 mi (579.76 km) |
| Boston to Olsberg | 377.26 mi (607.14 km) |
| Boston to Oranienburg | 552.45 mi (889.09 km) |
| Boston to Ortenberg | 428.59 mi (689.75 km) |
