| Altoona to Nuth | 3,903.73 mi (6,282.44 km) |
| Altoona to Oegstgeest | 3,812.48 mi (6,135.60 km) |
| Altoona to Oirschot | 3,864.03 mi (6,218.55 km) |
| Altoona to Oisterwijk | 3,857.76 mi (6,208.46 km) |
| Altoona to Oldebroek | 3,860.59 mi (6,213.02 km) |
| Altoona to Oldenzaal | 3,904.10 mi (6,283.04 km) |
| Altoona to Ommen | 3,878.56 mi (6,241.94 km) |
| Altoona to Oosterend | 3,851.51 mi (6,198.40 km) |
| Altoona to Oosterhout | 3,842.62 mi (6,184.11 km) |
| Altoona to Oosterwolde | 3,860.44 mi (6,212.78 km) |
| Altoona to Oostzaan | 3,821.83 mi (6,150.63 km) |
| Altoona to Opmeer | 3,817.12 mi (6,143.07 km) |
| Altoona to Oss | 3,864.97 mi (6,220.07 km) |
| Altoona to Oud-Beijerland | 3,819.90 mi (6,147.54 km) |
| Altoona to Oudenbosch | 3,831.04 mi (6,165.47 km) |
