| Grottaferrata to Oerlinghausen | 727.96 mi (1,171.54 km) |
| Grottaferrata to Oestrich-Winkel | 609.92 mi (981.57 km) |
| Grottaferrata to Offenburg | 515.77 mi (830.05 km) |
| Grottaferrata to Oftersheim | 559.71 mi (900.77 km) |
| Grottaferrata to Ohrdruf | 631.35 mi (1,016.06 km) |
| Grottaferrata to Ohringen | 534.51 mi (860.22 km) |
| Grottaferrata to Olbernhau | 614.25 mi (988.53 km) |
| Grottaferrata to Olching | 447.90 mi (720.83 km) |
| Grottaferrata to Oldenburg | 811.35 mi (1,305.74 km) |
| Grottaferrata to Oldenburg in Holstein | 868.34 mi (1,397.46 km) |
| Grottaferrata to Olfen | 729.75 mi (1,174.42 km) |
| Grottaferrata to Olpe | 677.64 mi (1,090.55 km) |
| Grottaferrata to Olsberg | 689.66 mi (1,109.90 km) |
| Grottaferrata to Oranienburg | 758.14 mi (1,220.11 km) |
| Grottaferrata to Ortenberg | 616.62 mi (992.35 km) |
