| Clay to Orbetello | 5,050.28 mi (8,127.65 km) |
| Clay to Oria | 5,402.48 mi (8,694.46 km) |
| Clay to Oristano | 5,020.28 mi (8,079.36 km) |
| Clay to Orta Nova | 5,287.18 mi (8,508.90 km) |
| Clay to Orte | 5,100.91 mi (8,209.13 km) |
| Clay to Ortona | 5,192.29 mi (8,356.18 km) |
| Clay to Orvieto | 5,079.70 mi (8,174.99 km) |
| Clay to Orzinuovi | 4,893.54 mi (7,875.40 km) |
| Clay to Osimo | 5,111.50 mi (8,226.17 km) |
| Clay to Ospitaletto | 4,894.28 mi (7,876.59 km) |
| Clay to Ostuni | 5,391.19 mi (8,676.29 km) |
| Clay to Ottaviano | 5,251.39 mi (8,451.29 km) |
| Clay to Ovada | 4,863.63 mi (7,827.25 km) |
| Clay to Ozieri | 5,015.81 mi (8,072.17 km) |
| Clay to Paceco | 5,270.99 mi (8,482.83 km) |
