| Piedmont to Olivares | 5,834.66 mi (9,389.98 km) |
| Piedmont to Olivenza | 5,736.43 mi (9,231.90 km) |
| Piedmont to Olot | 5,907.76 mi (9,507.62 km) |
| Piedmont to Onate | 5,696.68 mi (9,167.92 km) |
| Piedmont to Onda | 5,927.85 mi (9,539.95 km) |
| Piedmont to Onteniente | 5,973.79 mi (9,613.89 km) |
| Piedmont to Orihuela | 5,998.93 mi (9,654.35 km) |
| Piedmont to Osuna | 5,884.51 mi (9,470.20 km) |
| Piedmont to Ourense | 5,533.75 mi (8,905.71 km) |
| Piedmont to Oviedo | 5,559.00 mi (8,946.34 km) |
| Piedmont to Paiporta | 5,949.67 mi (9,575.07 km) |
| Piedmont to Pajara | 5,921.73 mi (9,530.11 km) |
| Piedmont to Palafolls | 5,943.43 mi (9,565.03 km) |
| Piedmont to Palafrugell | 5,944.11 mi (9,566.12 km) |
| Piedmont to Palamos | 5,946.75 mi (9,570.37 km) |
