| Arroyo Grande to Orbetello | 6,274.02 mi (10,097.06 km) |
| Arroyo Grande to Oria | 6,575.61 mi (10,582.43 km) |
| Arroyo Grande to Oristano | 6,326.25 mi (10,181.12 km) |
| Arroyo Grande to Orta Nova | 6,472.06 mi (10,415.78 km) |
| Arroyo Grande to Orte | 6,309.02 mi (10,153.39 km) |
| Arroyo Grande to Ortona | 6,375.68 mi (10,260.67 km) |
| Arroyo Grande to Orvieto | 6,286.34 mi (10,116.89 km) |
| Arroyo Grande to Orzinuovi | 6,073.66 mi (9,774.62 km) |
| Arroyo Grande to Osimo | 6,285.02 mi (10,114.77 km) |
| Arroyo Grande to Ospitaletto | 6,069.47 mi (9,767.87 km) |
| Arroyo Grande to Ostuni | 6,560.69 mi (10,558.41 km) |
| Arroyo Grande to Ottaviano | 6,462.51 mi (10,400.40 km) |
| Arroyo Grande to Ovada | 6,075.09 mi (9,776.91 km) |
| Arroyo Grande to Ozieri | 6,303.63 mi (10,144.72 km) |
| Arroyo Grande to Paceco | 6,561.97 mi (10,560.47 km) |
