| Frosinone to Oberkirch | 541.26 mi (871.07 km) |
| Frosinone to Obernburg am Main | 602.00 mi (968.83 km) |
| Frosinone to Obernkirchen | 760.97 mi (1,224.66 km) |
| Frosinone to Oberschleissheim | 465.38 mi (748.95 km) |
| Frosinone to Oberstdorf | 426.73 mi (686.75 km) |
| Frosinone to Obertraubling | 509.86 mi (820.54 km) |
| Frosinone to Obertshausen | 621.62 mi (1,000.40 km) |
| Frosinone to Oberursel | 634.69 mi (1,021.43 km) |
| Frosinone to Ochsenfurt | 576.01 mi (927.00 km) |
| Frosinone to Ochsenhausen | 474.94 mi (764.34 km) |
| Frosinone to Ochtrup | 785.49 mi (1,264.12 km) |
| Frosinone to Odenthal | 713.69 mi (1,148.57 km) |
| Frosinone to Oelde | 746.05 mi (1,200.65 km) |
| Frosinone to Oelsnitz | 609.50 mi (980.90 km) |
| Frosinone to Oer-Erkenschwick | 748.99 mi (1,205.38 km) |
