| Acton to Orbetello | 826.37 mi (1,329.91 km) |
| Acton to Oria | 1,142.19 mi (1,838.18 km) |
| Acton to Oristano | 907.34 mi (1,460.22 km) |
| Acton to Orta Nova | 1,032.41 mi (1,661.50 km) |
| Acton to Orte | 862.02 mi (1,387.28 km) |
| Acton to Ortona | 934.91 mi (1,504.59 km) |
| Acton to Orvieto | 839.34 mi (1,350.78 km) |
| Acton to Orzinuovi | 629.06 mi (1,012.37 km) |
| Acton to Osimo | 846.10 mi (1,361.67 km) |
| Acton to Ospitaletto | 626.20 mi (1,007.77 km) |
| Acton to Ostuni | 1,128.53 mi (1,816.20 km) |
| Acton to Ottaviano | 1,016.39 mi (1,635.72 km) |
| Acton to Ovada | 627.61 mi (1,010.05 km) |
| Acton to Ozieri | 874.74 mi (1,407.77 km) |
| Acton to Paceco | 1,123.22 mi (1,807.65 km) |
