| Quincy to Oerlinghausen | 3,614.93 mi (5,817.67 km) |
| Quincy to Oestrich-Winkel | 3,642.64 mi (5,862.26 km) |
| Quincy to Offenburg | 3,683.92 mi (5,928.70 km) |
| Quincy to Oftersheim | 3,684.42 mi (5,929.50 km) |
| Quincy to Ohrdruf | 3,728.32 mi (6,000.16 km) |
| Quincy to Ohringen | 3,726.77 mi (5,997.66 km) |
| Quincy to Olbernhau | 3,835.49 mi (6,172.63 km) |
| Quincy to Olching | 3,831.62 mi (6,166.40 km) |
| Quincy to Oldenburg | 3,566.25 mi (5,739.32 km) |
| Quincy to Oldenburg in Holstein | 3,636.82 mi (5,852.90 km) |
| Quincy to Olfen | 3,571.09 mi (5,747.12 km) |
| Quincy to Olpe | 3,607.76 mi (5,806.13 km) |
| Quincy to Olsberg | 3,624.50 mi (5,833.08 km) |
| Quincy to Oranienburg | 3,768.60 mi (6,064.97 km) |
| Quincy to Ortenberg | 3,675.14 mi (5,914.56 km) |
