| Clearlake to Orbetello | 6,112.40 mi (9,836.95 km) |
| Clearlake to Oria | 6,402.02 mi (10,303.05 km) |
| Clearlake to Oristano | 6,177.74 mi (9,942.11 km) |
| Clearlake to Orta Nova | 6,301.65 mi (10,141.52 km) |
| Clearlake to Orte | 6,144.43 mi (9,888.50 km) |
| Clearlake to Ortona | 6,206.31 mi (9,988.10 km) |
| Clearlake to Orvieto | 6,121.82 mi (9,852.12 km) |
| Clearlake to Orzinuovi | 5,907.86 mi (9,507.78 km) |
| Clearlake to Osimo | 6,115.34 mi (9,841.69 km) |
| Clearlake to Ospitaletto | 5,902.96 mi (9,499.90 km) |
| Clearlake to Ostuni | 6,386.73 mi (10,278.45 km) |
| Clearlake to Ottaviano | 6,296.34 mi (10,132.99 km) |
| Clearlake to Ovada | 5,914.20 mi (9,517.98 km) |
| Clearlake to Ozieri | 6,152.28 mi (9,901.13 km) |
| Clearlake to Paceco | 6,407.71 mi (10,312.21 km) |
