| Piedmont to Orbetello | 6,167.12 mi (9,925.02 km) |
| Piedmont to Oria | 6,459.85 mi (10,396.12 km) |
| Piedmont to Oristano | 6,229.14 mi (10,024.83 km) |
| Piedmont to Orta Nova | 6,358.65 mi (10,233.26 km) |
| Piedmont to Orte | 6,199.91 mi (9,977.79 km) |
| Piedmont to Ortona | 6,263.02 mi (10,079.36 km) |
| Piedmont to Orvieto | 6,177.28 mi (9,941.37 km) |
| Piedmont to Orzinuovi | 5,963.57 mi (9,597.44 km) |
| Piedmont to Osimo | 6,172.10 mi (9,933.04 km) |
| Piedmont to Ospitaletto | 5,958.85 mi (9,589.85 km) |
| Piedmont to Ostuni | 6,444.65 mi (10,371.66 km) |
| Piedmont to Ottaviano | 6,352.28 mi (10,223.00 km) |
| Piedmont to Ovada | 5,968.66 mi (9,605.64 km) |
| Piedmont to Ozieri | 6,204.40 mi (9,985.02 km) |
| Piedmont to Paceco | 6,460.67 mi (10,397.44 km) |
