| Lake Tapps to Orbetello | 5,617.66 mi (9,040.75 km) |
| Lake Tapps to Oria | 5,892.02 mi (9,482.29 km) |
| Lake Tapps to Oristano | 5,698.93 mi (9,171.54 km) |
| Lake Tapps to Orta Nova | 5,795.68 mi (9,327.25 km) |
| Lake Tapps to Orte | 5,645.97 mi (9,086.31 km) |
| Lake Tapps to Ortona | 5,701.97 mi (9,176.43 km) |
| Lake Tapps to Orvieto | 5,623.56 mi (9,050.24 km) |
| Lake Tapps to Orzinuovi | 5,409.06 mi (8,705.05 km) |
| Lake Tapps to Osimo | 5,611.03 mi (9,030.08 km) |
| Lake Tapps to Ospitaletto | 5,403.35 mi (8,695.85 km) |
| Lake Tapps to Ostuni | 5,876.39 mi (9,457.13 km) |
| Lake Tapps to Ottaviano | 5,795.34 mi (9,326.70 km) |
| Lake Tapps to Ovada | 5,421.32 mi (8,724.78 km) |
| Lake Tapps to Ozieri | 5,670.01 mi (9,125.00 km) |
| Lake Tapps to Paceco | 5,920.48 mi (9,528.09 km) |
