| N | Manchester |
| NA | Manchester |
| NB | Manchester |
| NC | Manchester |
| ND | Manchester |
| NE | Manchester |
| NF | Manchester |
| NG | Norwich |
| NH | Northampton |
| NJ | Brighton |
| NK | Luton (Hertfordshire until 1974) |
| NL | Newcastle upon Tyne |
| NM | Luton |
| NN | Nottingham |
| NO | Chelmsford |
| NP | Worcester |
| NR | Leicester |
| NS | Glasgow (Sutherland until 1974) |
| NT | Shrewsbury |
| NU | Nottingham |
| NV | Northampton |
| NW | Leeds |
| NX | Dudley |
| NY | Cardiff |