| Guardiagrele to Oerlinghausen | 723.04 mi (1,163.62 km) |
| Guardiagrele to Oestrich-Winkel | 615.24 mi (990.14 km) |
| Guardiagrele to Offenburg | 529.33 mi (851.88 km) |
| Guardiagrele to Oftersheim | 564.51 mi (908.48 km) |
| Guardiagrele to Ohrdruf | 618.55 mi (995.45 km) |
| Guardiagrele to Ohringen | 534.27 mi (859.82 km) |
| Guardiagrele to Olbernhau | 586.49 mi (943.87 km) |
| Guardiagrele to Olching | 437.86 mi (704.66 km) |
| Guardiagrele to Oldenburg | 805.37 mi (1,296.12 km) |
| Guardiagrele to Oldenburg in Holstein | 849.73 mi (1,367.51 km) |
| Guardiagrele to Olfen | 731.49 mi (1,177.22 km) |
| Guardiagrele to Olpe | 679.75 mi (1,093.95 km) |
| Guardiagrele to Olsberg | 687.43 mi (1,106.32 km) |
| Guardiagrele to Oranienburg | 730.65 mi (1,175.87 km) |
| Guardiagrele to Ortenberg | 614.68 mi (989.24 km) |
