| Ardea to Nottingham | 1,009.30 mi (1,624.31 km) |
| Ardea to Nuneaton | 997.99 mi (1,606.11 km) |
| Ardea to Oadby | 989.79 mi (1,592.92 km) |
| Ardea to Oakengates | 1,036.42 mi (1,667.95 km) |
| Ardea to Oakham | 983.17 mi (1,582.25 km) |
| Ardea to Oldbury | 1,014.06 mi (1,631.97 km) |
| Ardea to Oldham | 1,066.44 mi (1,716.28 km) |
| Ardea to Ollerton | 1,017.79 mi (1,637.97 km) |
| Ardea to Olton | 1,004.38 mi (1,616.40 km) |
| Ardea to Omagh | 1,272.73 mi (2,048.27 km) |
| Ardea to Ormesby | 1,091.34 mi (1,756.35 km) |
| Ardea to Ormskirk | 1,090.31 mi (1,754.68 km) |
| Ardea to Orpington | 894.91 mi (1,440.22 km) |
| Ardea to Ossett | 1,057.69 mi (1,702.18 km) |
| Ardea to Oswaldtwistle | 1,084.13 mi (1,744.74 km) |
