| Calexico to Oberkirch | 5,836.11 mi (9,392.32 km) |
| Calexico to Obernburg am Main | 5,805.14 mi (9,342.47 km) |
| Calexico to Obernkirchen | 5,684.31 mi (9,148.01 km) |
| Calexico to Oberschleissheim | 5,960.40 mi (9,592.33 km) |
| Calexico to Oberstdorf | 5,962.50 mi (9,595.72 km) |
| Calexico to Obertraubling | 5,942.09 mi (9,562.87 km) |
| Calexico to Obertshausen | 5,784.36 mi (9,309.03 km) |
| Calexico to Oberursel | 5,769.67 mi (9,285.39 km) |
| Calexico to Ochsenfurt | 5,843.21 mi (9,403.73 km) |
| Calexico to Ochsenhausen | 5,918.64 mi (9,525.14 km) |
| Calexico to Ochtrup | 5,629.56 mi (9,059.90 km) |
| Calexico to Odenthal | 5,683.85 mi (9,147.28 km) |
| Calexico to Oelde | 5,676.67 mi (9,135.72 km) |
| Calexico to Oelsnitz | 5,867.52 mi (9,442.86 km) |
| Calexico to Oer-Erkenschwick | 5,658.59 mi (9,106.62 km) |
