| Barnsley to Orbetello | 963.47 mi (1,550.56 km) |
| Barnsley to Oria | 1,266.55 mi (2,038.32 km) |
| Barnsley to Oristano | 1,054.40 mi (1,696.90 km) |
| Barnsley to Orta Nova | 1,159.66 mi (1,866.30 km) |
| Barnsley to Orte | 995.61 mi (1,602.27 km) |
| Barnsley to Ortona | 1,062.68 mi (1,710.22 km) |
| Barnsley to Orvieto | 972.96 mi (1,565.83 km) |
| Barnsley to Orzinuovi | 759.73 mi (1,222.66 km) |
| Barnsley to Osimo | 972.51 mi (1,565.11 km) |
| Barnsley to Ospitaletto | 755.54 mi (1,215.92 km) |
| Barnsley to Ostuni | 1,252.29 mi (2,015.37 km) |
| Barnsley to Ottaviano | 1,148.61 mi (1,848.50 km) |
| Barnsley to Ovada | 766.08 mi (1,232.88 km) |
| Barnsley to Ozieri | 1,020.47 mi (1,642.30 km) |
| Barnsley to Paceco | 1,265.60 mi (2,036.79 km) |
