| Mont-Saint-Martin to Oria | 849.68 mi (1,367.43 km) |
| Mont-Saint-Martin to Oristano | 679.73 mi (1,093.92 km) |
| Mont-Saint-Martin to Orta Nova | 742.78 mi (1,195.39 km) |
| Mont-Saint-Martin to Orte | 582.47 mi (937.39 km) |
| Mont-Saint-Martin to Ortona | 645.95 mi (1,039.56 km) |
| Mont-Saint-Martin to Orvieto | 559.98 mi (901.21 km) |
| Mont-Saint-Martin to Orzinuovi | 345.55 mi (556.10 km) |
| Mont-Saint-Martin to Osimo | 555.61 mi (894.17 km) |
| Mont-Saint-Martin to Ospitaletto | 340.35 mi (547.74 km) |
| Mont-Saint-Martin to Ostuni | 835.51 mi (1,344.62 km) |
| Mont-Saint-Martin to Ottaviano | 733.72 mi (1,180.81 km) |
| Mont-Saint-Martin to Ovada | 364.45 mi (586.53 km) |
| Mont-Saint-Martin to Ozieri | 638.31 mi (1,027.26 km) |
| Mont-Saint-Martin to Paceco | 866.19 mi (1,393.99 km) |
| Mont-Saint-Martin to Pachino | 1,001.19 mi (1,611.26 km) |
