| Glen Burnie to Opwijk | 3,823.92 mi (6,154.01 km) |
| Glen Burnie to Ostend | 3,766.31 mi (6,061.29 km) |
| Glen Burnie to Oud-Heverlee | 3,846.90 mi (6,190.99 km) |
| Glen Burnie to Oud-Turnhout | 3,847.25 mi (6,191.56 km) |
| Glen Burnie to Oudenaarde | 3,803.19 mi (6,120.64 km) |
| Glen Burnie to Oudenburg | 3,770.61 mi (6,068.21 km) |
| Glen Burnie to Oupeye | 3,889.67 mi (6,259.81 km) |
| Glen Burnie to Overijse | 3,842.78 mi (6,184.36 km) |
| Glen Burnie to Overpelt | 3,867.21 mi (6,223.68 km) |
| Glen Burnie to Paal | 3,862.02 mi (6,215.32 km) |
| Glen Burnie to Peer | 3,870.88 mi (6,229.58 km) |
| Glen Burnie to Pepinster | 3,900.45 mi (6,277.17 km) |
| Glen Burnie to Peruwelz | 3,810.87 mi (6,133.01 km) |
| Glen Burnie to Perwez | 3,858.33 mi (6,209.38 km) |
| Glen Burnie to Philippeville | 3,858.56 mi (6,209.76 km) |
