| Norristown to Noventa Vicentina | 4,203.54 mi (6,764.94 km) |
| Norristown to Novi di Modena | 4,189.60 mi (6,742.50 km) |
| Norristown to Novi Ligure | 4,102.81 mi (6,602.83 km) |
| Norristown to Nuoro | 4,276.58 mi (6,882.48 km) |
| Norristown to Occhiobello | 4,217.74 mi (6,787.80 km) |
| Norristown to Oderzo | 4,227.34 mi (6,803.25 km) |
| Norristown to Oggiono | 4,094.14 mi (6,588.87 km) |
| Norristown to Olbia | 4,263.26 mi (6,861.05 km) |
| Norristown to Oleggio | 4,069.30 mi (6,548.91 km) |
| Norristown to Olgiate Comasco | 4,077.76 mi (6,562.52 km) |
| Norristown to Olgiate Olona | 4,078.97 mi (6,564.46 km) |
| Norristown to Omegna | 4,050.80 mi (6,519.14 km) |
| Norristown to Opera | 4,101.28 mi (6,600.37 km) |
| Norristown to Oppeano | 4,188.09 mi (6,740.08 km) |
| Norristown to Orbassano | 4,040.67 mi (6,502.83 km) |
