| Zionsville to Orbetello | 4,762.36 mi (7,664.28 km) |
| Zionsville to Oria | 5,107.69 mi (8,220.03 km) |
| Zionsville to Oristano | 4,752.13 mi (7,647.81 km) |
| Zionsville to Orta Nova | 4,993.49 mi (8,036.25 km) |
| Zionsville to Orte | 4,810.04 mi (7,741.01 km) |
| Zionsville to Ortona | 4,897.03 mi (7,881.01 km) |
| Zionsville to Orvieto | 4,788.21 mi (7,705.89 km) |
| Zionsville to Orzinuovi | 4,593.61 mi (7,392.70 km) |
| Zionsville to Osimo | 4,813.00 mi (7,745.77 km) |
| Zionsville to Ospitaletto | 4,593.26 mi (7,392.14 km) |
| Zionsville to Ostuni | 5,095.45 mi (8,200.34 km) |
| Zionsville to Ottaviano | 4,963.16 mi (7,987.43 km) |
| Zionsville to Ovada | 4,570.39 mi (7,355.34 km) |
| Zionsville to Ozieri | 4,742.99 mi (7,633.10 km) |
| Zionsville to Paceco | 5,002.18 mi (8,050.23 km) |
