| Groves to Orbetello | 5,542.30 mi (8,919.48 km) |
| Groves to Oria | 5,892.72 mi (9,483.42 km) |
| Groves to Oristano | 5,516.88 mi (8,878.56 km) |
| Groves to Orta Nova | 5,777.68 mi (9,298.28 km) |
| Groves to Orte | 5,592.12 mi (8,999.65 km) |
| Groves to Ortona | 5,682.22 mi (9,144.65 km) |
| Groves to Orvieto | 5,570.71 mi (8,965.19 km) |
| Groves to Orzinuovi | 5,381.68 mi (8,660.98 km) |
| Groves to Osimo | 5,600.30 mi (9,012.82 km) |
| Groves to Ospitaletto | 5,382.04 mi (8,661.56 km) |
| Groves to Ostuni | 5,881.12 mi (9,464.75 km) |
| Groves to Ottaviano | 5,743.47 mi (9,243.23 km) |
| Groves to Ovada | 5,353.93 mi (8,616.32 km) |
| Groves to Ozieri | 5,511.49 mi (8,869.88 km) |
| Groves to Paceco | 5,767.62 mi (9,282.09 km) |
