| Rocky River to Oberkirch | 4,160.25 mi (6,695.27 km) |
| Rocky River to Obernburg am Main | 4,155.99 mi (6,688.42 km) |
| Rocky River to Obernkirchen | 4,072.20 mi (6,553.58 km) |
| Rocky River to Oberschleissheim | 4,306.92 mi (6,931.31 km) |
| Rocky River to Oberstdorf | 4,287.33 mi (6,899.80 km) |
| Rocky River to Obertraubling | 4,303.58 mi (6,925.94 km) |
| Rocky River to Obertshausen | 4,136.28 mi (6,656.71 km) |
| Rocky River to Oberursel | 4,121.74 mi (6,633.29 km) |
| Rocky River to Ochsenfurt | 4,198.24 mi (6,756.41 km) |
| Rocky River to Ochsenhausen | 4,250.14 mi (6,839.93 km) |
| Rocky River to Ochtrup | 4,002.48 mi (6,441.37 km) |
| Rocky River to Odenthal | 4,037.92 mi (6,498.40 km) |
| Rocky River to Oelde | 4,050.60 mi (6,518.81 km) |
| Rocky River to Oelsnitz | 4,250.34 mi (6,840.25 km) |
| Rocky River to Oer-Erkenschwick | 4,023.05 mi (6,474.47 km) |
