| Olgiate Olona to Oberkirch | 203.87 mi (328.10 km) |
| Olgiate Olona to Obernburg am Main | 290.90 mi (468.16 km) |
| Olgiate Olona to Obernkirchen | 458.43 mi (737.76 km) |
| Olgiate Olona to Oberschleissheim | 220.67 mi (355.14 km) |
| Olgiate Olona to Oberstdorf | 139.52 mi (224.54 km) |
| Olgiate Olona to Obertraubling | 276.87 mi (445.57 km) |
| Olgiate Olona to Obertshausen | 306.33 mi (492.99 km) |
| Olgiate Olona to Oberursel | 316.07 mi (508.67 km) |
| Olgiate Olona to Ochsenfurt | 282.93 mi (455.33 km) |
| Olgiate Olona to Ochsenhausen | 175.86 mi (283.02 km) |
| Olgiate Olona to Ochtrup | 460.53 mi (741.15 km) |
| Olgiate Olona to Odenthal | 381.79 mi (614.44 km) |
| Olgiate Olona to Oelde | 429.67 mi (691.49 km) |
| Olgiate Olona to Oelsnitz | 363.57 mi (585.11 km) |
| Olgiate Olona to Oer-Erkenschwick | 421.78 mi (678.79 km) |
