| Rockville Centre to Opwijk | 3,636.45 mi (5,852.30 km) |
| Rockville Centre to Ostend | 3,578.82 mi (5,759.55 km) |
| Rockville Centre to Oud-Heverlee | 3,659.43 mi (5,889.28 km) |
| Rockville Centre to Oud-Turnhout | 3,660.03 mi (5,890.25 km) |
| Rockville Centre to Oudenaarde | 3,615.61 mi (5,818.76 km) |
| Rockville Centre to Oudenburg | 3,583.11 mi (5,766.45 km) |
| Rockville Centre to Oupeye | 3,702.24 mi (5,958.19 km) |
| Rockville Centre to Overijse | 3,655.27 mi (5,882.59 km) |
| Rockville Centre to Overpelt | 3,679.99 mi (5,922.38 km) |
| Rockville Centre to Paal | 3,674.69 mi (5,913.84 km) |
| Rockville Centre to Peer | 3,683.62 mi (5,928.22 km) |
| Rockville Centre to Pepinster | 3,712.99 mi (5,975.48 km) |
| Rockville Centre to Peruwelz | 3,623.16 mi (5,830.91 km) |
| Rockville Centre to Perwez | 3,670.78 mi (5,907.55 km) |
| Rockville Centre to Philippeville | 3,670.82 mi (5,907.61 km) |
