| Harborne to Orbetello | 923.19 mi (1,485.72 km) |
| Harborne to Oria | 1,238.10 mi (1,992.52 km) |
| Harborne to Oristano | 1,000.99 mi (1,610.94 km) |
| Harborne to Orta Nova | 1,128.71 mi (1,816.48 km) |
| Harborne to Orte | 958.84 mi (1,543.11 km) |
| Harborne to Ortona | 1,031.25 mi (1,659.63 km) |
| Harborne to Orvieto | 936.16 mi (1,506.61 km) |
| Harborne to Orzinuovi | 725.61 mi (1,167.75 km) |
| Harborne to Osimo | 942.21 mi (1,516.34 km) |
| Harborne to Ospitaletto | 722.58 mi (1,162.89 km) |
| Harborne to Ostuni | 1,224.33 mi (1,970.37 km) |
| Harborne to Ottaviano | 1,113.17 mi (1,791.47 km) |
| Harborne to Ovada | 724.39 mi (1,165.79 km) |
| Harborne to Ozieri | 969.39 mi (1,560.08 km) |
| Harborne to Paceco | 1,219.16 mi (1,962.05 km) |
