| Castelletto sopra Ticino to Oberkirch | 196.32 mi (315.94 km) |
| Castelletto sopra Ticino to Obernburg am Main | 285.87 mi (460.06 km) |
| Castelletto sopra Ticino to Obernkirchen | 453.07 mi (729.15 km) |
| Castelletto sopra Ticino to Oberschleissheim | 223.02 mi (358.92 km) |
| Castelletto sopra Ticino to Oberstdorf | 140.69 mi (226.42 km) |
| Castelletto sopra Ticino to Obertraubling | 278.80 mi (448.69 km) |
| Castelletto sopra Ticino to Obertshausen | 300.70 mi (483.93 km) |
| Castelletto sopra Ticino to Oberursel | 310.00 mi (498.90 km) |
| Castelletto sopra Ticino to Ochsenfurt | 279.81 mi (450.31 km) |
| Castelletto sopra Ticino to Ochsenhausen | 174.18 mi (280.31 km) |
| Castelletto sopra Ticino to Ochtrup | 453.07 mi (729.14 km) |
| Castelletto sopra Ticino to Odenthal | 373.86 mi (601.66 km) |
| Castelletto sopra Ticino to Oelde | 423.19 mi (681.05 km) |
| Castelletto sopra Ticino to Oelsnitz | 363.31 mi (584.70 km) |
| Castelletto sopra Ticino to Oer-Erkenschwick | 414.22 mi (666.62 km) |
