| Rialto to Orbetello | 6,229.06 mi (10,024.70 km) |
| Rialto to Oria | 6,539.61 mi (10,524.49 km) |
| Rialto to Oristano | 6,271.00 mi (10,092.20 km) |
| Rialto to Orta Nova | 6,433.70 mi (10,354.04 km) |
| Rialto to Orte | 6,266.35 mi (10,084.71 km) |
| Rialto to Ortona | 6,336.70 mi (10,197.94 km) |
| Rialto to Orvieto | 6,243.67 mi (10,048.21 km) |
| Rialto to Orzinuovi | 6,032.57 mi (9,708.48 km) |
| Rialto to Osimo | 6,246.54 mi (10,052.83 km) |
| Rialto to Ospitaletto | 6,028.96 mi (9,702.67 km) |
| Rialto to Ostuni | 6,525.02 mi (10,501.01 km) |
| Rialto to Ottaviano | 6,420.70 mi (10,333.12 km) |
| Rialto to Ovada | 6,030.06 mi (9,704.45 km) |
| Rialto to Ozieri | 6,250.60 mi (10,059.37 km) |
| Rialto to Paceco | 6,510.50 mi (10,477.64 km) |
