| Santa Maria to Orbetello | 6,280.61 mi (10,107.67 km) |
| Santa Maria to Oria | 6,582.88 mi (10,594.12 km) |
| Santa Maria to Oristano | 6,332.08 mi (10,190.49 km) |
| Santa Maria to Orta Nova | 6,479.16 mi (10,427.19 km) |
| Santa Maria to Orte | 6,315.79 mi (10,164.28 km) |
| Santa Maria to Ortona | 6,382.72 mi (10,272.00 km) |
| Santa Maria to Orvieto | 6,293.11 mi (10,127.78 km) |
| Santa Maria to Orzinuovi | 6,080.53 mi (9,785.66 km) |
| Santa Maria to Osimo | 6,292.09 mi (10,126.14 km) |
| Santa Maria to Ospitaletto | 6,076.38 mi (9,778.99 km) |
| Santa Maria to Ostuni | 6,567.98 mi (10,570.14 km) |
| Santa Maria to Ottaviano | 6,469.35 mi (10,411.41 km) |
| Santa Maria to Ovada | 6,081.66 mi (9,787.49 km) |
| Santa Maria to Ozieri | 6,309.63 mi (10,154.36 km) |
| Santa Maria to Paceco | 6,568.10 mi (10,570.34 km) |
