| Monterotondo to Oberkirch | 498.99 mi (803.05 km) |
| Monterotondo to Obernburg am Main | 563.38 mi (906.66 km) |
| Monterotondo to Obernkirchen | 724.55 mi (1,166.05 km) |
| Monterotondo to Oberschleissheim | 431.41 mi (694.29 km) |
| Monterotondo to Oberstdorf | 387.64 mi (623.84 km) |
| Monterotondo to Obertraubling | 478.33 mi (769.80 km) |
| Monterotondo to Obertshausen | 582.65 mi (937.68 km) |
| Monterotondo to Oberursel | 595.40 mi (958.20 km) |
| Monterotondo to Ochsenfurt | 539.17 mi (867.71 km) |
| Monterotondo to Ochsenhausen | 435.93 mi (701.56 km) |
| Monterotondo to Ochtrup | 746.08 mi (1,200.70 km) |
| Monterotondo to Odenthal | 673.01 mi (1,083.10 km) |
| Monterotondo to Oelde | 707.69 mi (1,138.92 km) |
| Monterotondo to Oelsnitz | 578.48 mi (930.97 km) |
| Monterotondo to Oer-Erkenschwick | 709.13 mi (1,141.23 km) |
