| San Felice Circeo to Oberkirch | 560.47 mi (901.99 km) |
| San Felice Circeo to Obernburg am Main | 624.33 mi (1,004.77 km) |
| San Felice Circeo to Obernkirchen | 784.78 mi (1,262.98 km) |
| San Felice Circeo to Oberschleissheim | 490.41 mi (789.24 km) |
| San Felice Circeo to Oberstdorf | 448.67 mi (722.06 km) |
| San Felice Circeo to Obertraubling | 536.03 mi (862.66 km) |
| San Felice Circeo to Obertshausen | 643.70 mi (1,035.94 km) |
| San Felice Circeo to Oberursel | 656.53 mi (1,056.59 km) |
| San Felice Circeo to Ochsenfurt | 599.52 mi (964.83 km) |
| San Felice Circeo to Ochsenhausen | 496.96 mi (799.77 km) |
| San Felice Circeo to Ochtrup | 807.27 mi (1,299.17 km) |
| San Felice Circeo to Odenthal | 734.41 mi (1,181.92 km) |
| San Felice Circeo to Oelde | 768.60 mi (1,236.94 km) |
| San Felice Circeo to Oelsnitz | 635.93 mi (1,023.44 km) |
| San Felice Circeo to Oer-Erkenschwick | 770.40 mi (1,239.84 km) |
