| Great Cornard to Orbetello | 822.59 mi (1,323.84 km) |
| Great Cornard to Oria | 1,128.11 mi (1,815.51 km) |
| Great Cornard to Oristano | 916.84 mi (1,475.52 km) |
| Great Cornard to Orta Nova | 1,020.32 mi (1,642.05 km) |
| Great Cornard to Orte | 854.95 mi (1,375.91 km) |
| Great Cornard to Ortona | 923.15 mi (1,485.67 km) |
| Great Cornard to Orvieto | 832.29 mi (1,339.45 km) |
| Great Cornard to Orzinuovi | 619.38 mi (996.79 km) |
| Great Cornard to Osimo | 833.28 mi (1,341.03 km) |
| Great Cornard to Ospitaletto | 615.43 mi (990.43 km) |
| Great Cornard to Ostuni | 1,114.03 mi (1,792.85 km) |
| Great Cornard to Ottaviano | 1,008.19 mi (1,622.52 km) |
| Great Cornard to Ovada | 625.27 mi (1,006.28 km) |
| Great Cornard to Ozieri | 881.80 mi (1,419.12 km) |
| Great Cornard to Paceco | 1,125.28 mi (1,810.97 km) |
