| Union Hill-Novelty Hill to Orbetello | 5,588.09 mi (8,993.16 km) |
| Union Hill-Novelty Hill to Oria | 5,861.83 mi (9,433.71 km) |
| Union Hill-Novelty Hill to Oristano | 5,669.99 mi (9,124.98 km) |
| Union Hill-Novelty Hill to Orta Nova | 5,765.66 mi (9,278.93 km) |
| Union Hill-Novelty Hill to Orte | 5,616.25 mi (9,038.48 km) |
| Union Hill-Novelty Hill to Ortona | 5,672.01 mi (9,128.22 km) |
| Union Hill-Novelty Hill to Orvieto | 5,593.85 mi (9,002.42 km) |
| Union Hill-Novelty Hill to Orzinuovi | 5,379.36 mi (8,657.24 km) |
| Union Hill-Novelty Hill to Osimo | 5,581.08 mi (8,981.89 km) |
| Union Hill-Novelty Hill to Ospitaletto | 5,373.61 mi (8,647.98 km) |
| Union Hill-Novelty Hill to Ostuni | 5,846.19 mi (9,408.54 km) |
| Union Hill-Novelty Hill to Ottaviano | 5,765.50 mi (9,278.68 km) |
| Union Hill-Novelty Hill to Ovada | 5,391.85 mi (8,677.34 km) |
| Union Hill-Novelty Hill to Ozieri | 5,640.94 mi (9,078.22 km) |
| Union Hill-Novelty Hill to Paceco | 5,891.17 mi (9,480.92 km) |
