| Guymon to Orbetello | 5,522.36 mi (8,887.38 km) |
| Guymon to Oria | 5,856.08 mi (9,424.45 km) |
| Guymon to Oristano | 5,533.18 mi (8,904.79 km) |
| Guymon to Orta Nova | 5,744.37 mi (9,244.68 km) |
| Guymon to Orte | 5,566.12 mi (8,957.81 km) |
| Guymon to Ortona | 5,646.93 mi (9,087.85 km) |
| Guymon to Orvieto | 5,543.78 mi (8,921.85 km) |
| Guymon to Orzinuovi | 5,340.74 mi (8,595.08 km) |
| Guymon to Osimo | 5,559.67 mi (8,947.42 km) |
| Guymon to Ospitaletto | 5,339.01 mi (8,592.31 km) |
| Guymon to Ostuni | 5,842.78 mi (9,403.05 km) |
| Guymon to Ottaviano | 5,720.91 mi (9,206.91 km) |
| Guymon to Ovada | 5,326.02 mi (8,571.40 km) |
| Guymon to Ozieri | 5,519.48 mi (8,882.74 km) |
| Guymon to Paceco | 5,780.59 mi (9,302.96 km) |
