| Riccione Marina to Oberkirch | 381.53 mi (614.02 km) |
| Riccione Marina to Obernburg am Main | 436.03 mi (701.72 km) |
| Riccione Marina to Obernkirchen | 593.74 mi (955.53 km) |
| Riccione Marina to Oberschleissheim | 298.18 mi (479.88 km) |
| Riccione Marina to Oberstdorf | 261.86 mi (421.42 km) |
| Riccione Marina to Obertraubling | 343.87 mi (553.41 km) |
| Riccione Marina to Obertshausen | 455.92 mi (733.74 km) |
| Riccione Marina to Oberursel | 469.29 mi (755.25 km) |
| Riccione Marina to Ochsenfurt | 408.97 mi (658.17 km) |
| Riccione Marina to Ochsenhausen | 309.72 mi (498.45 km) |
| Riccione Marina to Ochtrup | 619.96 mi (997.73 km) |
| Riccione Marina to Odenthal | 549.92 mi (885.01 km) |
| Riccione Marina to Oelde | 579.67 mi (932.90 km) |
| Riccione Marina to Oelsnitz | 443.93 mi (714.43 km) |
| Riccione Marina to Oer-Erkenschwick | 584.03 mi (939.91 km) |
