| Buckeye to Orbetello | 6,104.89 mi (9,824.87 km) |
| Buckeye to Oria | 6,426.10 mi (10,341.80 km) |
| Buckeye to Oristano | 6,133.35 mi (9,870.67 km) |
| Buckeye to Orta Nova | 6,317.45 mi (10,166.96 km) |
| Buckeye to Orte | 6,145.03 mi (9,889.48 km) |
| Buckeye to Ortona | 6,220.00 mi (10,010.12 km) |
| Buckeye to Orvieto | 6,122.44 mi (9,853.11 km) |
| Buckeye to Orzinuovi | 5,914.15 mi (9,517.90 km) |
| Buckeye to Osimo | 6,130.79 mi (9,866.56 km) |
| Buckeye to Ospitaletto | 5,911.32 mi (9,513.35 km) |
| Buckeye to Ostuni | 6,412.01 mi (10,319.13 km) |
| Buckeye to Ottaviano | 6,299.99 mi (10,138.85 km) |
| Buckeye to Ovada | 5,906.50 mi (9,505.59 km) |
| Buckeye to Ozieri | 6,115.88 mi (9,842.55 km) |
| Buckeye to Paceco | 6,376.93 mi (10,262.67 km) |
