| Mexborough to Orbetello | 955.23 mi (1,537.29 km) |
| Mexborough to Oria | 1,257.84 mi (2,024.30 km) |
| Mexborough to Oristano | 1,047.02 mi (1,685.01 km) |
| Mexborough to Orta Nova | 1,151.03 mi (1,852.40 km) |
| Mexborough to Orte | 987.19 mi (1,588.74 km) |
| Mexborough to Ortona | 1,054.07 mi (1,696.35 km) |
| Mexborough to Orvieto | 964.55 mi (1,552.29 km) |
| Mexborough to Orzinuovi | 751.24 mi (1,209.01 km) |
| Mexborough to Osimo | 963.87 mi (1,551.20 km) |
| Mexborough to Ospitaletto | 747.01 mi (1,202.20 km) |
| Mexborough to Ostuni | 1,243.57 mi (2,001.32 km) |
| Mexborough to Ottaviano | 1,140.13 mi (1,834.86 km) |
| Mexborough to Ovada | 757.94 mi (1,219.78 km) |
| Mexborough to Ozieri | 1,012.90 mi (1,630.11 km) |
| Mexborough to Paceco | 1,257.67 mi (2,024.03 km) |
