| Placentia to Orbetello | 6,257.80 mi (10,070.95 km) |
| Placentia to Oria | 6,567.75 mi (10,569.78 km) |
| Placentia to Oristano | 6,300.38 mi (10,139.48 km) |
| Placentia to Orta Nova | 6,462.00 mi (10,399.59 km) |
| Placentia to Orte | 6,294.93 mi (10,130.72 km) |
| Placentia to Ortona | 6,365.04 mi (10,243.54 km) |
| Placentia to Orvieto | 6,272.25 mi (10,094.22 km) |
| Placentia to Orzinuovi | 6,061.03 mi (9,754.29 km) |
| Placentia to Osimo | 6,274.83 mi (10,098.37 km) |
| Placentia to Ospitaletto | 6,057.38 mi (9,748.41 km) |
| Placentia to Ostuni | 6,553.14 mi (10,546.26 km) |
| Placentia to Ottaviano | 6,449.24 mi (10,379.05 km) |
| Placentia to Ovada | 6,058.79 mi (9,750.68 km) |
| Placentia to Ozieri | 6,279.85 mi (10,106.44 km) |
| Placentia to Paceco | 6,539.67 mi (10,524.58 km) |
