NN postcode area
The NN area holds 19 districts and 17,156 live postcodes; its largest place is Northampton.
| District | Live postcodes | Largest place with its centre there |
|---|---|---|
| NN1 | 830 | Northampton |
| NN2 | 798 | — |
| NN3 | 1,315 | — |
| NN4 | 980 | Hardingstone |
| NN5 | 893 | — |
| NN6 | 1,191 | Earls Barton |
| NN7 | 859 | Weedon Bec |
| NN8 | 1,254 | Wellingborough |
| NN9 | 675 | Raunds |
| NN10 | 859 | Rushden |
| NN11 | 1,182 | Daventry |
| NN12 | 838 | Towcester |
| NN13 | 565 | Brackley |
| NN14 | 1,223 | Desborough |
| NN15 | 950 | Kettering |
| NN16 | 897 | — |
| NN17 | 909 | Corby |
| NN18 | 658 | — |
| NN29 | 280 | Irchester |
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v3.0. Postcode data is the ONS Postcode Directory, August 2026 edition; counts are live postcodes with a usable location. Northern Ireland postcodes carry a separate licence and are not included; Scotland joins when the site's Scottish coverage does.