| Waterville to Orbetello | 3,880.80 mi (6,245.55 km) |
| Waterville to Oria | 4,231.32 mi (6,809.66 km) |
| Waterville to Oristano | 3,859.14 mi (6,210.69 km) |
| Waterville to Orta Nova | 4,116.23 mi (6,624.43 km) |
| Waterville to Orte | 3,930.59 mi (6,325.67 km) |
| Waterville to Ortona | 4,020.89 mi (6,470.99 km) |
| Waterville to Orvieto | 3,909.18 mi (6,291.22 km) |
| Waterville to Orzinuovi | 3,721.02 mi (5,988.40 km) |
| Waterville to Osimo | 3,939.35 mi (6,339.78 km) |
| Waterville to Ospitaletto | 3,721.58 mi (5,989.31 km) |
| Waterville to Ostuni | 4,219.80 mi (6,791.11 km) |
| Waterville to Ottaviano | 4,081.97 mi (6,569.30 km) |
| Waterville to Ovada | 3,692.49 mi (5,942.49 km) |
| Waterville to Ozieri | 3,852.33 mi (6,199.72 km) |
| Waterville to Paceco | 4,109.77 mi (6,614.03 km) |
