| Warrenville to Orbetello | 4,759.84 mi (7,660.23 km) |
| Warrenville to Oria | 5,100.79 mi (8,208.92 km) |
| Warrenville to Oristano | 4,759.20 mi (7,659.19 km) |
| Warrenville to Orta Nova | 4,987.45 mi (8,026.53 km) |
| Warrenville to Orte | 4,805.92 mi (7,734.38 km) |
| Warrenville to Ortona | 4,890.46 mi (7,870.44 km) |
| Warrenville to Orvieto | 4,783.84 mi (7,698.85 km) |
| Warrenville to Orzinuovi | 4,585.50 mi (7,379.64 km) |
| Warrenville to Osimo | 4,805.01 mi (7,732.91 km) |
| Warrenville to Ospitaletto | 4,584.59 mi (7,378.19 km) |
| Warrenville to Ostuni | 5,088.11 mi (8,188.52 km) |
| Warrenville to Ottaviano | 4,959.93 mi (7,982.24 km) |
| Warrenville to Ovada | 4,565.76 mi (7,347.89 km) |
| Warrenville to Ozieri | 4,747.86 mi (7,640.95 km) |
| Warrenville to Paceco | 5,008.23 mi (8,059.97 km) |
