| Rocky River to Opwijk | 3,927.02 mi (6,319.93 km) |
| Rocky River to Ostend | 3,869.92 mi (6,228.04 km) |
| Rocky River to Oud-Heverlee | 3,949.97 mi (6,356.87 km) |
| Rocky River to Oud-Turnhout | 3,947.01 mi (6,352.10 km) |
| Rocky River to Oudenaarde | 3,907.91 mi (6,289.18 km) |
| Rocky River to Oudenburg | 3,874.34 mi (6,235.15 km) |
| Rocky River to Oupeye | 3,991.82 mi (6,424.21 km) |
| Rocky River to Overijse | 3,946.36 mi (6,351.06 km) |
| Rocky River to Overpelt | 3,966.84 mi (6,384.01 km) |
| Rocky River to Paal | 3,963.07 mi (6,377.94 km) |
| Rocky River to Peer | 3,970.92 mi (6,390.58 km) |
| Rocky River to Pepinster | 4,003.12 mi (6,442.39 km) |
| Rocky River to Peruwelz | 3,917.56 mi (6,304.70 km) |
| Rocky River to Perwez | 3,962.35 mi (6,376.79 km) |
| Rocky River to Philippeville | 3,965.46 mi (6,381.79 km) |
