| Alenquer to Nottingham | 1,030.67 mi (1,658.70 km) |
| Alenquer to Nuneaton | 998.10 mi (1,606.28 km) |
| Alenquer to Oadby | 1,009.71 mi (1,624.98 km) |
| Alenquer to Oakengates | 993.26 mi (1,598.49 km) |
| Alenquer to Oakham | 1,020.40 mi (1,642.18 km) |
| Alenquer to Oldbury | 987.83 mi (1,589.75 km) |
| Alenquer to Oldham | 1,053.03 mi (1,694.68 km) |
| Alenquer to Ollerton | 1,048.42 mi (1,687.27 km) |
| Alenquer to Olton | 986.99 mi (1,588.40 km) |
| Alenquer to Omagh | 1,076.72 mi (1,732.82 km) |
| Alenquer to Ormesby | 1,131.51 mi (1,820.99 km) |
| Alenquer to Ormskirk | 1,043.83 mi (1,679.88 km) |
| Alenquer to Orpington | 958.46 mi (1,542.49 km) |
| Alenquer to Ossett | 1,069.80 mi (1,721.67 km) |
| Alenquer to Oswaldtwistle | 1,061.98 mi (1,709.10 km) |
