| Gallup to Orbetello | 5,853.26 mi (9,419.91 km) |
| Gallup to Oria | 6,177.89 mi (9,942.35 km) |
| Gallup to Oristano | 5,877.52 mi (9,458.95 km) |
| Gallup to Orta Nova | 6,068.37 mi (9,766.09 km) |
| Gallup to Orte | 5,894.33 mi (9,486.02 km) |
| Gallup to Ortona | 5,970.84 mi (9,609.14 km) |
| Gallup to Orvieto | 5,871.78 mi (9,449.72 km) |
| Gallup to Orzinuovi | 5,664.68 mi (9,116.42 km) |
| Gallup to Osimo | 5,882.07 mi (9,466.28 km) |
| Gallup to Ospitaletto | 5,662.13 mi (9,112.31 km) |
| Gallup to Ostuni | 6,164.00 mi (9,920.00 km) |
| Gallup to Ottaviano | 6,049.35 mi (9,735.49 km) |
| Gallup to Ovada | 5,655.24 mi (9,101.23 km) |
| Gallup to Ozieri | 5,860.91 mi (9,432.22 km) |
| Gallup to Paceco | 6,122.11 mi (9,852.59 km) |
