| Ellicott City to Opwijk | 3,827.63 mi (6,159.97 km) |
| Ellicott City to Ostend | 3,770.03 mi (6,067.28 km) |
| Ellicott City to Oud-Heverlee | 3,850.61 mi (6,196.96 km) |
| Ellicott City to Oud-Turnhout | 3,850.80 mi (6,197.27 km) |
| Ellicott City to Oudenaarde | 3,806.97 mi (6,126.72 km) |
| Ellicott City to Oudenburg | 3,774.33 mi (6,074.20 km) |
| Ellicott City to Oupeye | 3,893.34 mi (6,265.73 km) |
| Ellicott City to Overijse | 3,846.51 mi (6,190.37 km) |
| Ellicott City to Overpelt | 3,870.76 mi (6,229.39 km) |
| Ellicott City to Paal | 3,865.64 mi (6,221.14 km) |
| Ellicott City to Peer | 3,874.45 mi (6,235.32 km) |
| Ellicott City to Pepinster | 3,904.15 mi (6,283.13 km) |
| Ellicott City to Peruwelz | 3,814.75 mi (6,139.24 km) |
| Ellicott City to Perwez | 3,862.08 mi (6,215.42 km) |
| Ellicott City to Philippeville | 3,862.46 mi (6,216.03 km) |
