| Grado to Orbetello | 875.60 mi (1,409.14 km) |
| Grado to Oria | 1,230.26 mi (1,979.92 km) |
| Grado to Oristano | 793.23 mi (1,276.58 km) |
| Grado to Orta Nova | 1,118.04 mi (1,799.31 km) |
| Grado to Orte | 934.23 mi (1,503.50 km) |
| Grado to Ortona | 1,036.63 mi (1,668.30 km) |
| Grado to Orvieto | 917.41 mi (1,476.43 km) |
| Grado to Orzinuovi | 801.00 mi (1,289.08 km) |
| Grado to Osimo | 978.96 mi (1,575.49 km) |
| Grado to Ospitaletto | 808.62 mi (1,301.35 km) |
| Grado to Ostuni | 1,223.09 mi (1,968.38 km) |
| Grado to Ottaviano | 1,064.93 mi (1,713.84 km) |
| Grado to Ovada | 735.51 mi (1,183.68 km) |
| Grado to Ozieri | 796.93 mi (1,282.54 km) |
| Grado to Paceco | 1,041.97 mi (1,676.88 km) |
