| Phoenixville to Oberkirch | 3,962.86 mi (6,377.61 km) |
| Phoenixville to Obernburg am Main | 3,967.18 mi (6,384.57 km) |
| Phoenixville to Obernkirchen | 3,896.27 mi (6,270.44 km) |
| Phoenixville to Oberschleissheim | 4,114.52 mi (6,621.68 km) |
| Phoenixville to Oberstdorf | 4,088.39 mi (6,579.62 km) |
| Phoenixville to Obertraubling | 4,115.86 mi (6,623.83 km) |
| Phoenixville to Obertshausen | 3,948.12 mi (6,353.88 km) |
| Phoenixville to Oberursel | 3,933.84 mi (6,330.90 km) |
| Phoenixville to Ochsenfurt | 4,010.10 mi (6,453.63 km) |
| Phoenixville to Ochsenhausen | 4,053.83 mi (6,524.01 km) |
| Phoenixville to Ochtrup | 3,823.06 mi (6,152.62 km) |
| Phoenixville to Odenthal | 3,851.96 mi (6,199.14 km) |
| Phoenixville to Oelde | 3,870.70 mi (6,229.29 km) |
| Phoenixville to Oelsnitz | 4,069.95 mi (6,549.95 km) |
| Phoenixville to Oer-Erkenschwick | 3,840.63 mi (6,180.89 km) |
