| Owings Mills to Opwijk | 3,819.82 mi (6,147.41 km) |
| Owings Mills to Ostend | 3,762.23 mi (6,054.72 km) |
| Owings Mills to Oud-Heverlee | 3,842.80 mi (6,184.40 km) |
| Owings Mills to Oud-Turnhout | 3,842.94 mi (6,184.61 km) |
| Owings Mills to Oudenaarde | 3,799.19 mi (6,114.20 km) |
| Owings Mills to Oudenburg | 3,766.53 mi (6,061.65 km) |
| Owings Mills to Oupeye | 3,885.52 mi (6,253.14 km) |
| Owings Mills to Overijse | 3,838.72 mi (6,177.82 km) |
| Owings Mills to Overpelt | 3,862.89 mi (6,216.73 km) |
| Owings Mills to Paal | 3,857.79 mi (6,208.52 km) |
| Owings Mills to Peer | 3,866.59 mi (6,222.67 km) |
| Owings Mills to Pepinster | 3,896.34 mi (6,270.56 km) |
| Owings Mills to Peruwelz | 3,807.01 mi (6,126.78 km) |
| Owings Mills to Perwez | 3,854.30 mi (6,202.89 km) |
| Owings Mills to Philippeville | 3,854.72 mi (6,203.58 km) |
