| Clacton-on-Sea to Nottingham | 125.76 mi (202.39 km) |
| Clacton-on-Sea to Nuneaton | 121.76 mi (195.95 km) |
| Clacton-on-Sea to Oadby | 109.37 mi (176.02 km) |
| Clacton-on-Sea to Oakengates | 164.44 mi (264.64 km) |
| Clacton-on-Sea to Oakham | 100.04 mi (161.00 km) |
| Clacton-on-Sea to Oldbury | 142.80 mi (229.81 km) |
| Clacton-on-Sea to Oldham | 182.59 mi (293.85 km) |
| Clacton-on-Sea to Ollerton | 133.28 mi (214.49 km) |
| Clacton-on-Sea to Olton | 132.93 mi (213.93 km) |
| Clacton-on-Sea to Omagh | 398.79 mi (641.79 km) |
| Clacton-on-Sea to Ormesby | 213.49 mi (343.57 km) |
| Clacton-on-Sea to Ormskirk | 208.69 mi (335.85 km) |
| Clacton-on-Sea to Orpington | 53.42 mi (85.97 km) |
| Clacton-on-Sea to Ossett | 173.25 mi (278.81 km) |
| Clacton-on-Sea to Oswaldtwistle | 200.11 mi (322.04 km) |
