| Clacton-on-Sea to Orbetello | 799.42 mi (1,286.54 km) |
| Clacton-on-Sea to Oria | 1,104.89 mi (1,778.15 km) |
| Clacton-on-Sea to Oristano | 894.89 mi (1,440.19 km) |
| Clacton-on-Sea to Orta Nova | 997.04 mi (1,604.59 km) |
| Clacton-on-Sea to Orte | 831.66 mi (1,338.43 km) |
| Clacton-on-Sea to Ortona | 899.86 mi (1,448.19 km) |
| Clacton-on-Sea to Orvieto | 809.01 mi (1,301.97 km) |
| Clacton-on-Sea to Orzinuovi | 596.07 mi (959.28 km) |
| Clacton-on-Sea to Osimo | 810.01 mi (1,303.58 km) |
| Clacton-on-Sea to Ospitaletto | 592.12 mi (952.92 km) |
| Clacton-on-Sea to Ostuni | 1,090.83 mi (1,755.52 km) |
| Clacton-on-Sea to Ottaviano | 984.88 mi (1,585.02 km) |
| Clacton-on-Sea to Ovada | 602.20 mi (969.15 km) |
| Clacton-on-Sea to Ozieri | 859.53 mi (1,383.29 km) |
| Clacton-on-Sea to Paceco | 1,102.45 mi (1,774.21 km) |
