| Herndon to Opwijk | 3,863.90 mi (6,218.35 km) |
| Herndon to Ostend | 3,806.31 mi (6,125.66 km) |
| Herndon to Oud-Heverlee | 3,886.89 mi (6,255.34 km) |
| Herndon to Oud-Turnhout | 3,887.04 mi (6,255.58 km) |
| Herndon to Oudenaarde | 3,843.26 mi (6,185.13 km) |
| Herndon to Oudenburg | 3,810.61 mi (6,132.59 km) |
| Herndon to Oupeye | 3,929.61 mi (6,324.09 km) |
| Herndon to Overijse | 3,882.79 mi (6,248.75 km) |
| Herndon to Overpelt | 3,907.00 mi (6,287.70 km) |
| Herndon to Paal | 3,901.89 mi (6,279.48 km) |
| Herndon to Peer | 3,910.69 mi (6,293.64 km) |
| Herndon to Pepinster | 3,940.43 mi (6,341.50 km) |
| Herndon to Peruwelz | 3,851.06 mi (6,197.68 km) |
| Herndon to Perwez | 3,898.37 mi (6,273.82 km) |
| Herndon to Philippeville | 3,898.77 mi (6,274.47 km) |
