| Monte San Pietro to Oberkirch | 318.14 mi (511.99 km) |
| Monte San Pietro to Obernburg am Main | 384.20 mi (618.30 km) |
| Monte San Pietro to Obernkirchen | 547.85 mi (881.69 km) |
| Monte San Pietro to Oberschleissheim | 262.60 mi (422.62 km) |
| Monte San Pietro to Oberstdorf | 208.69 mi (335.85 km) |
| Monte San Pietro to Obertraubling | 314.82 mi (506.66 km) |
| Monte San Pietro to Obertshausen | 403.04 mi (648.64 km) |
| Monte San Pietro to Oberursel | 415.46 mi (668.62 km) |
| Monte San Pietro to Ochsenfurt | 362.67 mi (583.66 km) |
| Monte San Pietro to Ochsenhausen | 256.77 mi (413.23 km) |
| Monte San Pietro to Ochtrup | 565.88 mi (910.70 km) |
| Monte San Pietro to Odenthal | 492.13 mi (792.00 km) |
| Monte San Pietro to Oelde | 528.50 mi (850.54 km) |
| Monte San Pietro to Oelsnitz | 414.19 mi (666.57 km) |
| Monte San Pietro to Oer-Erkenschwick | 528.63 mi (850.75 km) |
