| Baltimore to Opwijk | 3,817.48 mi (6,143.64 km) |
| Baltimore to Ostend | 3,759.87 mi (6,050.93 km) |
| Baltimore to Oud-Heverlee | 3,840.46 mi (6,180.62 km) |
| Baltimore to Oud-Turnhout | 3,840.72 mi (6,181.04 km) |
| Baltimore to Oudenaarde | 3,796.78 mi (6,110.33 km) |
| Baltimore to Oudenburg | 3,764.17 mi (6,057.85 km) |
| Baltimore to Oupeye | 3,883.20 mi (6,249.41 km) |
| Baltimore to Overijse | 3,836.35 mi (6,174.01 km) |
| Baltimore to Overpelt | 3,860.68 mi (6,213.16 km) |
| Baltimore to Paal | 3,855.52 mi (6,204.87 km) |
| Baltimore to Peer | 3,864.36 mi (6,219.08 km) |
| Baltimore to Pepinster | 3,894.00 mi (6,266.80 km) |
| Baltimore to Peruwelz | 3,804.52 mi (6,122.79 km) |
| Baltimore to Perwez | 3,851.91 mi (6,199.05 km) |
| Baltimore to Philippeville | 3,852.22 mi (6,199.56 km) |
