| Rock Ferry to Oberkirch | 586.23 mi (943.44 km) |
| Rock Ferry to Obernburg am Main | 574.69 mi (924.87 km) |
| Rock Ferry to Obernkirchen | 511.41 mi (823.03 km) |
| Rock Ferry to Oberschleissheim | 726.21 mi (1,168.72 km) |
| Rock Ferry to Oberstdorf | 713.98 mi (1,149.03 km) |
| Rock Ferry to Obertraubling | 722.63 mi (1,162.96 km) |
| Rock Ferry to Obertshausen | 555.07 mi (893.31 km) |
| Rock Ferry to Oberursel | 540.59 mi (869.99 km) |
| Rock Ferry to Ochsenfurt | 617.08 mi (993.09 km) |
| Rock Ferry to Ochsenhausen | 673.22 mi (1,083.45 km) |
| Rock Ferry to Ochtrup | 433.30 mi (697.32 km) |
| Rock Ferry to Odenthal | 457.70 mi (736.60 km) |
| Rock Ferry to Oelde | 479.61 mi (771.86 km) |
| Rock Ferry to Oelsnitz | 676.97 mi (1,089.48 km) |
| Rock Ferry to Oer-Erkenschwick | 447.25 mi (719.77 km) |
