| Harrisburg to Oberkirch | 4,012.94 mi (6,458.20 km) |
| Harrisburg to Obernburg am Main | 4,015.63 mi (6,462.53 km) |
| Harrisburg to Obernkirchen | 3,942.20 mi (6,344.36 km) |
| Harrisburg to Oberschleissheim | 4,163.73 mi (6,700.87 km) |
| Harrisburg to Oberstdorf | 4,138.82 mi (6,660.79 km) |
| Harrisburg to Obertraubling | 4,164.18 mi (6,701.60 km) |
| Harrisburg to Obertshausen | 3,996.43 mi (6,431.63 km) |
| Harrisburg to Oberursel | 3,982.09 mi (6,408.56 km) |
| Harrisburg to Ochsenfurt | 4,058.44 mi (6,531.43 km) |
| Harrisburg to Ochsenhausen | 4,103.75 mi (6,604.34 km) |
| Harrisburg to Ochtrup | 3,869.62 mi (6,227.56 km) |
| Harrisburg to Odenthal | 3,899.80 mi (6,276.12 km) |
| Harrisburg to Oelde | 3,917.38 mi (6,304.42 km) |
| Harrisburg to Oelsnitz | 4,116.84 mi (6,625.42 km) |
| Harrisburg to Oer-Erkenschwick | 3,887.78 mi (6,256.77 km) |
