| Altoona to Oerlinghausen | 3,980.88 mi (6,406.60 km) |
| Altoona to Oestrich-Winkel | 4,015.10 mi (6,461.69 km) |
| Altoona to Offenburg | 4,060.62 mi (6,534.94 km) |
| Altoona to Oftersheim | 4,058.14 mi (6,530.94 km) |
| Altoona to Ohrdruf | 4,095.89 mi (6,591.70 km) |
| Altoona to Ohringen | 4,100.15 mi (6,598.55 km) |
| Altoona to Olbernhau | 4,201.00 mi (6,760.86 km) |
| Altoona to Olching | 4,206.00 mi (6,768.90 km) |
| Altoona to Oldenburg | 3,928.73 mi (6,322.67 km) |
| Altoona to Oldenburg in Holstein | 3,992.83 mi (6,425.84 km) |
| Altoona to Olfen | 3,938.95 mi (6,339.13 km) |
| Altoona to Olpe | 3,977.39 mi (6,400.99 km) |
| Altoona to Olsberg | 3,992.54 mi (6,425.38 km) |
| Altoona to Oranienburg | 4,127.62 mi (6,642.76 km) |
| Altoona to Ortenberg | 4,045.65 mi (6,510.84 km) |
