| San Luis Obispo to Orbetello | 6,268.40 mi (10,088.02 km) |
| San Luis Obispo to Oria | 6,569.54 mi (10,572.66 km) |
| San Luis Obispo to Oristano | 6,321.15 mi (10,172.91 km) |
| San Luis Obispo to Orta Nova | 6,466.11 mi (10,406.20 km) |
| San Luis Obispo to Orte | 6,303.29 mi (10,144.16 km) |
| San Luis Obispo to Ortona | 6,369.76 mi (10,251.15 km) |
| San Luis Obispo to Orvieto | 6,280.61 mi (10,107.67 km) |
| San Luis Obispo to Orzinuovi | 6,067.87 mi (9,765.29 km) |
| San Luis Obispo to Osimo | 6,279.09 mi (10,105.22 km) |
| San Luis Obispo to Ospitaletto | 6,063.65 mi (9,758.50 km) |
| San Luis Obispo to Ostuni | 6,554.60 mi (10,548.61 km) |
| San Luis Obispo to Ottaviano | 6,456.73 mi (10,391.09 km) |
| San Luis Obispo to Ovada | 6,069.49 mi (9,767.89 km) |
| San Luis Obispo to Ozieri | 6,298.42 mi (10,136.33 km) |
| San Luis Obispo to Paceco | 6,556.66 mi (10,551.93 km) |
