| Altoona to Oberkirch | 4,064.59 mi (6,541.32 km) |
| Altoona to Obernburg am Main | 4,065.36 mi (6,542.56 km) |
| Altoona to Obernkirchen | 3,989.00 mi (6,419.67 km) |
| Altoona to Oberschleissheim | 4,214.31 mi (6,782.27 km) |
| Altoona to Oberstdorf | 4,190.86 mi (6,744.54 km) |
| Altoona to Obertraubling | 4,213.70 mi (6,781.30 km) |
| Altoona to Obertshausen | 4,046.01 mi (6,511.42 km) |
| Altoona to Oberursel | 4,031.60 mi (6,488.24 km) |
| Altoona to Ochsenfurt | 4,108.03 mi (6,611.24 km) |
| Altoona to Ochsenhausen | 4,155.19 mi (6,687.13 km) |
| Altoona to Ochtrup | 3,917.18 mi (6,304.09 km) |
| Altoona to Odenthal | 3,948.84 mi (6,355.05 km) |
| Altoona to Oelde | 3,965.07 mi (6,381.16 km) |
| Altoona to Oelsnitz | 4,164.70 mi (6,702.44 km) |
| Altoona to Oer-Erkenschwick | 3,936.02 mi (6,334.41 km) |
