| Quincy to Orbetello | 4,018.38 mi (6,466.96 km) |
| Quincy to Oria | 4,370.97 mi (7,034.40 km) |
| Quincy to Oristano | 3,989.51 mi (6,420.50 km) |
| Quincy to Orta Nova | 4,255.61 mi (6,848.74 km) |
| Quincy to Orte | 4,069.17 mi (6,548.69 km) |
| Quincy to Ortona | 4,160.92 mi (6,696.35 km) |
| Quincy to Orvieto | 4,048.00 mi (6,514.63 km) |
| Quincy to Orzinuovi | 3,863.06 mi (6,216.99 km) |
| Quincy to Osimo | 4,080.61 mi (6,567.11 km) |
| Quincy to Ospitaletto | 3,864.00 mi (6,218.51 km) |
| Quincy to Ostuni | 4,359.79 mi (7,016.40 km) |
| Quincy to Ottaviano | 4,219.46 mi (6,790.57 km) |
| Quincy to Ovada | 3,832.18 mi (6,167.29 km) |
| Quincy to Ozieri | 3,984.43 mi (6,412.32 km) |
| Quincy to Paceco | 4,240.26 mi (6,824.03 km) |
