| Castelo Branco to Nottingham | 955.85 mi (1,538.29 km) |
| Castelo Branco to Nuneaton | 923.34 mi (1,485.97 km) |
| Castelo Branco to Oadby | 934.12 mi (1,503.31 km) |
| Castelo Branco to Oakengates | 921.34 mi (1,482.75 km) |
| Castelo Branco to Oakham | 944.11 mi (1,519.40 km) |
| Castelo Branco to Oldbury | 914.45 mi (1,471.66 km) |
| Castelo Branco to Oldham | 981.51 mi (1,579.58 km) |
| Castelo Branco to Ollerton | 973.70 mi (1,567.01 km) |
| Castelo Branco to Olton | 912.94 mi (1,469.24 km) |
| Castelo Branco to Omagh | 1,020.78 mi (1,642.79 km) |
| Castelo Branco to Ormesby | 1,059.22 mi (1,704.65 km) |
| Castelo Branco to Ormskirk | 974.33 mi (1,568.03 km) |
| Castelo Branco to Orpington | 877.85 mi (1,412.77 km) |
| Castelo Branco to Ossett | 997.16 mi (1,604.77 km) |
| Castelo Branco to Oswaldtwistle | 991.44 mi (1,595.57 km) |
