| Middlesex to Norwich | 3,520.01 mi (5,664.91 km) |
| Middlesex to Nottingham | 3,415.95 mi (5,497.43 km) |
| Middlesex to Nuneaton | 3,411.78 mi (5,490.73 km) |
| Middlesex to Oadby | 3,426.00 mi (5,513.61 km) |
| Middlesex to Oakengates | 3,368.86 mi (5,421.66 km) |
| Middlesex to Oakham | 3,438.29 mi (5,533.39 km) |
| Middlesex to Oldbury | 3,390.07 mi (5,455.79 km) |
| Middlesex to Oldham | 3,366.20 mi (5,417.38 km) |
| Middlesex to Ollerton | 3,416.24 mi (5,497.90 km) |
| Middlesex to Olton | 3,399.87 mi (5,471.56 km) |
| Middlesex to Omagh | 3,145.51 mi (5,062.20 km) |
| Middlesex to Ormesby | 3,384.27 mi (5,446.46 km) |
| Middlesex to Ormskirk | 3,335.31 mi (5,367.67 km) |
| Middlesex to Orpington | 3,499.56 mi (5,632.00 km) |
| Middlesex to Ossett | 3,384.86 mi (5,447.40 km) |
