| Mablethorpe to Orbetello | 905.94 mi (1,457.96 km) |
| Mablethorpe to Oria | 1,201.68 mi (1,933.91 km) |
| Mablethorpe to Oristano | 1,007.32 mi (1,621.12 km) |
| Mablethorpe to Orta Nova | 1,096.16 mi (1,764.10 km) |
| Mablethorpe to Orte | 935.70 mi (1,505.86 km) |
| Mablethorpe to Ortona | 999.59 mi (1,608.69 km) |
| Mablethorpe to Orvieto | 913.13 mi (1,469.54 km) |
| Mablethorpe to Orzinuovi | 699.00 mi (1,124.93 km) |
| Mablethorpe to Osimo | 909.03 mi (1,462.94 km) |
| Mablethorpe to Ospitaletto | 694.15 mi (1,117.13 km) |
| Mablethorpe to Ostuni | 1,187.20 mi (1,910.61 km) |
| Mablethorpe to Ottaviano | 1,087.58 mi (1,750.29 km) |
| Mablethorpe to Ovada | 710.27 mi (1,143.07 km) |
| Mablethorpe to Ozieri | 971.30 mi (1,563.15 km) |
| Mablethorpe to Paceco | 1,211.87 mi (1,950.32 km) |
