| Norco to Orbetello | 6,245.22 mi (10,050.71 km) |
| Norco to Oria | 6,555.76 mi (10,550.47 km) |
| Norco to Oristano | 6,287.13 mi (10,118.15 km) |
| Norco to Orta Nova | 6,449.85 mi (10,380.03 km) |
| Norco to Orte | 6,282.51 mi (10,110.72 km) |
| Norco to Ortona | 6,352.86 mi (10,223.94 km) |
| Norco to Orvieto | 6,259.83 mi (10,074.22 km) |
| Norco to Orzinuovi | 6,048.73 mi (9,734.48 km) |
| Norco to Osimo | 6,262.69 mi (10,078.83 km) |
| Norco to Ospitaletto | 6,045.12 mi (9,728.67 km) |
| Norco to Ostuni | 6,541.17 mi (10,527.00 km) |
| Norco to Ottaviano | 6,436.86 mi (10,359.13 km) |
| Norco to Ovada | 6,046.22 mi (9,730.45 km) |
| Norco to Ozieri | 6,266.74 mi (10,085.34 km) |
| Norco to Paceco | 6,526.64 mi (10,503.62 km) |
