| Meridian to Orbetello | 5,664.88 mi (9,116.74 km) |
| Meridian to Oria | 5,959.69 mi (9,591.20 km) |
| Meridian to Oristano | 5,726.16 mi (9,215.36 km) |
| Meridian to Orta Nova | 5,857.80 mi (9,427.22 km) |
| Meridian to Orte | 5,698.05 mi (9,170.13 km) |
| Meridian to Ortona | 5,761.96 mi (9,272.98 km) |
| Meridian to Orvieto | 5,675.41 mi (9,133.69 km) |
| Meridian to Orzinuovi | 5,461.87 mi (8,790.03 km) |
| Meridian to Osimo | 5,671.09 mi (9,126.74 km) |
| Meridian to Ospitaletto | 5,457.26 mi (8,782.61 km) |
| Meridian to Ostuni | 5,944.58 mi (9,566.87 km) |
| Meridian to Ottaviano | 5,850.67 mi (9,415.74 km) |
| Meridian to Ovada | 5,466.32 mi (8,797.20 km) |
| Meridian to Ozieri | 5,701.45 mi (9,175.60 km) |
| Meridian to Paceco | 5,957.84 mi (9,588.21 km) |
