| Rancho Santa Margarita to Orbetello | 6,263.42 mi (10,080.00 km) |
| Rancho Santa Margarita to Oria | 6,574.36 mi (10,580.41 km) |
| Rancho Santa Margarita to Oristano | 6,304.78 mi (10,146.57 km) |
| Rancho Santa Margarita to Orta Nova | 6,468.36 mi (10,409.81 km) |
| Rancho Santa Margarita to Orte | 6,300.82 mi (10,140.18 km) |
| Rancho Santa Margarita to Ortona | 6,371.34 mi (10,253.68 km) |
| Rancho Santa Margarita to Orvieto | 6,278.14 mi (10,103.69 km) |
| Rancho Santa Margarita to Orzinuovi | 6,067.12 mi (9,764.09 km) |
| Rancho Santa Margarita to Osimo | 6,281.20 mi (10,108.61 km) |
| Rancho Santa Margarita to Ospitaletto | 6,063.54 mi (9,758.33 km) |
| Rancho Santa Margarita to Ostuni | 6,559.79 mi (10,556.96 km) |
| Rancho Santa Margarita to Ottaviano | 6,455.20 mi (10,388.65 km) |
| Rancho Santa Margarita to Ovada | 6,064.43 mi (9,759.76 km) |
| Rancho Santa Margarita to Ozieri | 6,284.52 mi (10,113.96 km) |
| Rancho Santa Margarita to Paceco | 6,544.49 mi (10,532.34 km) |
