| Guastalla to Oberkirch | 278.19 mi (447.70 km) |
| Guastalla to Obernburg am Main | 347.55 mi (559.33 km) |
| Guastalla to Obernkirchen | 512.69 mi (825.10 km) |
| Guastalla to Oberschleissheim | 234.24 mi (376.97 km) |
| Guastalla to Oberstdorf | 173.24 mi (278.81 km) |
| Guastalla to Obertraubling | 288.56 mi (464.39 km) |
| Guastalla to Obertshausen | 365.95 mi (588.94 km) |
| Guastalla to Oberursel | 378.00 mi (608.33 km) |
| Guastalla to Ochsenfurt | 328.24 mi (528.26 km) |
| Guastalla to Ochsenhausen | 220.68 mi (355.16 km) |
| Guastalla to Ochtrup | 527.95 mi (849.65 km) |
| Guastalla to Odenthal | 453.26 mi (729.45 km) |
| Guastalla to Oelde | 491.57 mi (791.11 km) |
| Guastalla to Oelsnitz | 386.35 mi (621.77 km) |
| Guastalla to Oer-Erkenschwick | 490.37 mi (789.18 km) |
