| Gretz-Armainvilliers to Oria | 925.19 mi (1,488.95 km) |
| Gretz-Armainvilliers to Oristano | 675.14 mi (1,086.53 km) |
| Gretz-Armainvilliers to Orta Nova | 812.72 mi (1,307.95 km) |
| Gretz-Armainvilliers to Orte | 636.29 mi (1,024.01 km) |
| Gretz-Armainvilliers to Ortona | 715.35 mi (1,151.25 km) |
| Gretz-Armainvilliers to Orvieto | 613.71 mi (987.68 km) |
| Gretz-Armainvilliers to Orzinuovi | 409.68 mi (659.32 km) |
| Gretz-Armainvilliers to Osimo | 629.18 mi (1,012.57 km) |
| Gretz-Armainvilliers to Ospitaletto | 408.85 mi (657.99 km) |
| Gretz-Armainvilliers to Ostuni | 912.35 mi (1,468.28 km) |
| Gretz-Armainvilliers to Ottaviano | 791.29 mi (1,273.45 km) |
| Gretz-Armainvilliers to Ovada | 398.31 mi (641.02 km) |
| Gretz-Armainvilliers to Ozieri | 641.73 mi (1,032.76 km) |
| Gretz-Armainvilliers to Paceco | 890.33 mi (1,432.85 km) |
| Gretz-Armainvilliers to Pachino | 1,038.40 mi (1,671.14 km) |
