| Chamonix-Mont-Blanc to Oria | 658.02 mi (1,058.98 km) |
| Chamonix-Mont-Blanc to Oristano | 424.70 mi (683.50 km) |
| Chamonix-Mont-Blanc to Orta Nova | 543.73 mi (875.05 km) |
| Chamonix-Mont-Blanc to Orte | 363.05 mi (584.28 km) |
| Chamonix-Mont-Blanc to Ortona | 447.34 mi (719.92 km) |
| Chamonix-Mont-Blanc to Orvieto | 340.65 mi (548.23 km) |
| Chamonix-Mont-Blanc to Orzinuovi | 152.30 mi (245.11 km) |
| Chamonix-Mont-Blanc to Osimo | 365.77 mi (588.65 km) |
| Chamonix-Mont-Blanc to Ospitaletto | 156.58 mi (251.99 km) |
| Chamonix-Mont-Blanc to Ostuni | 646.07 mi (1,039.76 km) |
| Chamonix-Mont-Blanc to Ottaviano | 518.00 mi (833.65 km) |
| Chamonix-Mont-Blanc to Ovada | 123.79 mi (199.22 km) |
| Chamonix-Mont-Blanc to Ozieri | 384.05 mi (618.08 km) |
| Chamonix-Mont-Blanc to Paceco | 620.97 mi (999.35 km) |
| Chamonix-Mont-Blanc to Pachino | 765.21 mi (1,231.48 km) |
