| Lake Grove to Orbetello | 4,161.08 mi (6,696.61 km) |
| Lake Grove to Oria | 4,514.11 mi (7,264.75 km) |
| Lake Grove to Oristano | 4,130.26 mi (6,647.01 km) |
| Lake Grove to Orta Nova | 4,398.70 mi (7,079.02 km) |
| Lake Grove to Orte | 4,212.09 mi (6,778.71 km) |
| Lake Grove to Ortona | 4,304.16 mi (6,926.88 km) |
| Lake Grove to Orvieto | 4,190.99 mi (6,744.75 km) |
| Lake Grove to Orzinuovi | 4,006.74 mi (6,448.23 km) |
| Lake Grove to Osimo | 4,224.12 mi (6,798.07 km) |
| Lake Grove to Ospitaletto | 4,007.76 mi (6,449.87 km) |
| Lake Grove to Ostuni | 4,503.00 mi (7,246.87 km) |
| Lake Grove to Ottaviano | 4,362.12 mi (7,020.15 km) |
| Lake Grove to Ovada | 3,975.38 mi (6,397.76 km) |
| Lake Grove to Ozieri | 4,125.69 mi (6,639.66 km) |
| Lake Grove to Paceco | 4,380.98 mi (7,050.51 km) |
