| Norristown to Nuth | 3,799.14 mi (6,114.13 km) |
| Norristown to Oegstgeest | 3,710.12 mi (5,970.85 km) |
| Norristown to Oirschot | 3,760.49 mi (6,051.92 km) |
| Norristown to Oisterwijk | 3,754.35 mi (6,042.05 km) |
| Norristown to Oldebroek | 3,759.81 mi (6,050.83 km) |
| Norristown to Oldenzaal | 3,803.66 mi (6,121.40 km) |
| Norristown to Ommen | 3,778.28 mi (6,080.56 km) |
| Norristown to Oosterend | 3,752.24 mi (6,038.65 km) |
| Norristown to Oosterhout | 3,739.15 mi (6,017.58 km) |
| Norristown to Oosterwolde | 3,761.28 mi (6,053.20 km) |
| Norristown to Oostzaan | 3,720.35 mi (5,987.33 km) |
| Norristown to Opmeer | 3,716.37 mi (5,980.93 km) |
| Norristown to Oss | 3,762.23 mi (6,054.72 km) |
| Norristown to Oud-Beijerland | 3,716.57 mi (5,981.24 km) |
| Norristown to Oudenbosch | 3,727.22 mi (5,998.38 km) |
