| Warren to Orbetello | 4,521.62 mi (7,276.85 km) |
| Warren to Oria | 4,866.12 mi (7,831.27 km) |
| Warren to Oristano | 4,513.92 mi (7,264.46 km) |
| Warren to Orta Nova | 4,752.07 mi (7,647.72 km) |
| Warren to Orte | 4,568.97 mi (7,353.04 km) |
| Warren to Ortona | 4,655.50 mi (7,492.30 km) |
| Warren to Orvieto | 4,547.09 mi (7,317.83 km) |
| Warren to Orzinuovi | 4,351.77 mi (7,003.50 km) |
| Warren to Osimo | 4,571.21 mi (7,356.65 km) |
| Warren to Ospitaletto | 4,351.34 mi (7,002.80 km) |
| Warren to Ostuni | 4,853.81 mi (7,811.46 km) |
| Warren to Ottaviano | 4,722.30 mi (7,599.80 km) |
| Warren to Ovada | 4,329.18 mi (6,967.14 km) |
| Warren to Ozieri | 4,504.12 mi (7,248.68 km) |
| Warren to Paceco | 4,763.71 mi (7,666.45 km) |
