| Alliance to Orbetello | 4,505.84 mi (7,251.45 km) |
| Alliance to Oria | 4,854.00 mi (7,811.76 km) |
| Alliance to Oristano | 4,489.16 mi (7,224.61 km) |
| Alliance to Orta Nova | 4,739.29 mi (7,627.15 km) |
| Alliance to Orte | 4,554.63 mi (7,329.97 km) |
| Alliance to Ortona | 4,643.35 mi (7,472.74 km) |
| Alliance to Orvieto | 4,533.01 mi (7,295.18 km) |
| Alliance to Orzinuovi | 4,341.50 mi (6,986.97 km) |
| Alliance to Osimo | 4,560.51 mi (7,339.43 km) |
| Alliance to Ospitaletto | 4,341.60 mi (6,987.13 km) |
| Alliance to Ostuni | 4,842.12 mi (7,792.64 km) |
| Alliance to Ottaviano | 4,706.92 mi (7,575.05 km) |
| Alliance to Ovada | 4,315.65 mi (6,945.37 km) |
| Alliance to Ozieri | 4,481.42 mi (7,212.15 km) |
| Alliance to Paceco | 4,739.62 mi (7,627.69 km) |
