| Glenn Dale to Opwijk | 3,839.72 mi (6,179.44 km) |
| Glenn Dale to Ostend | 3,782.11 mi (6,086.71 km) |
| Glenn Dale to Oud-Heverlee | 3,862.70 mi (6,216.42 km) |
| Glenn Dale to Oud-Turnhout | 3,863.07 mi (6,217.02 km) |
| Glenn Dale to Oudenaarde | 3,818.98 mi (6,146.05 km) |
| Glenn Dale to Oudenburg | 3,786.40 mi (6,093.63 km) |
| Glenn Dale to Oupeye | 3,905.47 mi (6,285.25 km) |
| Glenn Dale to Overijse | 3,858.58 mi (6,209.78 km) |
| Glenn Dale to Overpelt | 3,883.04 mi (6,249.14 km) |
| Glenn Dale to Paal | 3,877.83 mi (6,240.77 km) |
| Glenn Dale to Peer | 3,886.70 mi (6,255.03 km) |
| Glenn Dale to Pepinster | 3,916.25 mi (6,302.60 km) |
| Glenn Dale to Peruwelz | 3,826.65 mi (6,158.39 km) |
| Glenn Dale to Perwez | 3,874.12 mi (6,234.79 km) |
| Glenn Dale to Philippeville | 3,874.33 mi (6,235.14 km) |
