| Negresti-Oas to Orbetello | 702.18 mi (1,130.04 km) |
| Negresti-Oas to Oria | 584.05 mi (939.94 km) |
| Negresti-Oas to Oristano | 918.42 mi (1,478.05 km) |
| Negresti-Oas to Orta Nova | 589.37 mi (948.50 km) |
| Negresti-Oas to Orte | 653.84 mi (1,052.26 km) |
| Negresti-Oas to Ortona | 581.61 mi (936.00 km) |
| Negresti-Oas to Orvieto | 654.03 mi (1,052.55 km) |
| Negresti-Oas to Orzinuovi | 661.43 mi (1,064.47 km) |
| Negresti-Oas to Osimo | 566.91 mi (912.36 km) |
| Negresti-Oas to Ospitaletto | 651.47 mi (1,048.44 km) |
| Negresti-Oas to Ostuni | 571.03 mi (918.98 km) |
| Negresti-Oas to Ottaviano | 655.29 mi (1,054.59 km) |
| Negresti-Oas to Ovada | 739.09 mi (1,189.45 km) |
| Negresti-Oas to Ozieri | 871.29 mi (1,402.21 km) |
| Negresti-Oas to Paceco | 875.28 mi (1,408.63 km) |
