| Great Harwood to Orbetello | 1,001.13 mi (1,611.17 km) |
| Great Harwood to Oria | 1,306.53 mi (2,102.65 km) |
| Great Harwood to Oristano | 1,087.95 mi (1,750.89 km) |
| Great Harwood to Orta Nova | 1,199.24 mi (1,930.00 km) |
| Great Harwood to Orte | 1,034.07 mi (1,664.18 km) |
| Great Harwood to Ortona | 1,102.16 mi (1,773.75 km) |
| Great Harwood to Orvieto | 1,011.41 mi (1,627.71 km) |
| Great Harwood to Orzinuovi | 798.59 mi (1,285.21 km) |
| Great Harwood to Osimo | 1,012.14 mi (1,628.87 km) |
| Great Harwood to Ospitaletto | 794.61 mi (1,278.81 km) |
| Great Harwood to Ostuni | 1,292.33 mi (2,079.80 km) |
| Great Harwood to Ottaviano | 1,187.40 mi (1,910.93 km) |
| Great Harwood to Ovada | 803.27 mi (1,292.74 km) |
| Great Harwood to Ozieri | 1,054.91 mi (1,697.71 km) |
| Great Harwood to Paceco | 1,301.69 mi (2,094.87 km) |
