| Frosinone to Oerlinghausen | 747.14 mi (1,202.40 km) |
| Frosinone to Oestrich-Winkel | 632.48 mi (1,017.88 km) |
| Frosinone to Offenburg | 540.81 mi (870.34 km) |
| Frosinone to Oftersheim | 581.98 mi (936.60 km) |
| Frosinone to Ohrdruf | 647.39 mi (1,041.87 km) |
| Frosinone to Ohringen | 554.96 mi (893.12 km) |
| Frosinone to Olbernhau | 624.15 mi (1,004.47 km) |
| Frosinone to Olching | 464.45 mi (747.45 km) |
| Frosinone to Oldenburg | 830.26 mi (1,336.17 km) |
| Frosinone to Oldenburg in Holstein | 882.45 mi (1,420.17 km) |
| Frosinone to Olfen | 751.30 mi (1,209.10 km) |
| Frosinone to Olpe | 699.23 mi (1,125.30 km) |
| Frosinone to Olsberg | 709.75 mi (1,142.23 km) |
| Frosinone to Oranienburg | 768.41 mi (1,236.64 km) |
| Frosinone to Ortenberg | 636.67 mi (1,024.62 km) |
