| Montlouis-sur-Loire to Oria | 959.13 mi (1,543.57 km) |
| Montlouis-sur-Loire to Oristano | 645.80 mi (1,039.32 km) |
| Montlouis-sur-Loire to Orta Nova | 844.01 mi (1,358.30 km) |
| Montlouis-sur-Loire to Orte | 659.06 mi (1,060.66 km) |
| Montlouis-sur-Loire to Ortona | 748.84 mi (1,205.13 km) |
| Montlouis-sur-Loire to Orvieto | 637.39 mi (1,025.77 km) |
| Montlouis-sur-Loire to Orzinuovi | 454.84 mi (732.00 km) |
| Montlouis-sur-Loire to Osimo | 669.28 mi (1,077.11 km) |
| Montlouis-sur-Loire to Ospitaletto | 457.52 mi (736.31 km) |
| Montlouis-sur-Loire to Ostuni | 947.74 mi (1,525.24 km) |
| Montlouis-sur-Loire to Ottaviano | 812.13 mi (1,307.00 km) |
| Montlouis-sur-Loire to Ovada | 420.27 mi (676.36 km) |
| Montlouis-sur-Loire to Ozieri | 620.73 mi (998.96 km) |
| Montlouis-sur-Loire to Paceco | 879.41 mi (1,415.27 km) |
| Montlouis-sur-Loire to Pachino | 1,035.98 mi (1,667.26 km) |
