| Norristown to Opwijk | 3,729.29 mi (6,001.71 km) |
| Norristown to Ostend | 3,671.68 mi (5,909.00 km) |
| Norristown to Oud-Heverlee | 3,752.27 mi (6,038.69 km) |
| Norristown to Oud-Turnhout | 3,752.54 mi (6,039.14 km) |
| Norristown to Oudenaarde | 3,708.59 mi (5,968.40 km) |
| Norristown to Oudenburg | 3,675.98 mi (5,915.92 km) |
| Norristown to Oupeye | 3,795.01 mi (6,107.48 km) |
| Norristown to Overijse | 3,748.16 mi (6,032.08 km) |
| Norristown to Overpelt | 3,772.50 mi (6,071.26 km) |
| Norristown to Paal | 3,767.34 mi (6,062.95 km) |
| Norristown to Peer | 3,776.18 mi (6,077.17 km) |
| Norristown to Pepinster | 3,805.81 mi (6,124.87 km) |
| Norristown to Peruwelz | 3,716.33 mi (5,980.85 km) |
| Norristown to Perwez | 3,763.72 mi (6,057.11 km) |
| Norristown to Philippeville | 3,764.03 mi (6,057.62 km) |
