| Rio Grande City to Oberkirch | 5,580.42 mi (8,980.82 km) |
| Rio Grande City to Obernburg am Main | 5,576.65 mi (8,974.75 km) |
| Rio Grande City to Obernkirchen | 5,491.69 mi (8,838.02 km) |
| Rio Grande City to Oberschleissheim | 5,727.53 mi (9,217.57 km) |
| Rio Grande City to Oberstdorf | 5,707.35 mi (9,185.10 km) |
| Rio Grande City to Obertraubling | 5,724.21 mi (9,212.23 km) |
| Rio Grande City to Obertshausen | 5,556.94 mi (8,943.03 km) |
| Rio Grande City to Oberursel | 5,542.39 mi (8,919.61 km) |
| Rio Grande City to Ochsenfurt | 5,618.89 mi (9,042.73 km) |
| Rio Grande City to Ochsenhausen | 5,670.46 mi (9,125.73 km) |
| Rio Grande City to Ochtrup | 5,422.55 mi (8,726.75 km) |
| Rio Grande City to Odenthal | 5,458.52 mi (8,784.64 km) |
| Rio Grande City to Oelde | 5,470.70 mi (8,804.25 km) |
| Rio Grande City to Oelsnitz | 5,670.39 mi (9,125.62 km) |
| Rio Grande City to Oer-Erkenschwick | 5,443.43 mi (8,760.36 km) |
