| Pottstown to Oberkirch | 3,963.04 mi (6,377.90 km) |
| Pottstown to Obernburg am Main | 3,967.05 mi (6,384.35 km) |
| Pottstown to Obernkirchen | 3,895.66 mi (6,269.46 km) |
| Pottstown to Oberschleissheim | 4,114.53 mi (6,621.70 km) |
| Pottstown to Oberstdorf | 4,088.64 mi (6,580.03 km) |
| Pottstown to Obertraubling | 4,115.70 mi (6,623.58 km) |
| Pottstown to Obertshausen | 3,947.96 mi (6,353.62 km) |
| Pottstown to Oberursel | 3,933.67 mi (6,330.62 km) |
| Pottstown to Ochsenfurt | 4,009.95 mi (6,453.38 km) |
| Pottstown to Ochsenhausen | 4,053.98 mi (6,524.25 km) |
| Pottstown to Ochtrup | 3,822.57 mi (6,151.83 km) |
| Pottstown to Odenthal | 3,851.71 mi (6,198.73 km) |
| Pottstown to Oelde | 3,870.23 mi (6,228.53 km) |
| Pottstown to Oelsnitz | 4,069.52 mi (6,549.26 km) |
| Pottstown to Oer-Erkenschwick | 3,840.24 mi (6,180.27 km) |
