IP postcode area
The IP area holds 34 districts and 21,951 live postcodes; its largest place is Ipswich.
| District | Live postcodes | Largest place with its centre there |
|---|---|---|
| IP1 | 1,111 | Ipswich |
| IP2 | 717 | — |
| IP3 | 765 | — |
| IP4 | 946 | — |
| IP5 | 460 | Kesgrave |
| IP6 | 789 | Needham Market |
| IP7 | 718 | Hadleigh |
| IP8 | 485 | Bramford |
| IP9 | 496 | Capel Saint Mary |
| IP10 | 191 | Bucklesham |
| IP11 | 974 | Felixstowe |
| IP12 | 1,057 | Woodbridge |
| IP13 | 1,183 | Framlingham |
| IP14 | 1,626 | Stowmarket |
| IP15 | 165 | Aldeburgh |
| IP16 | 324 | Leiston |
| IP17 | 733 | Saxmundham |
| IP18 | 295 | Southwold |
| IP19 | 598 | Halesworth |
| IP20 | 323 | Harleston |
| IP21 | 530 | Diss |
| IP22 | 871 | Rickinghall |
| IP23 | 340 | Eye |
| IP24 | 790 | Thetford |
| IP25 | 633 | Watton |
| IP26 | 340 | Feltwell |
| IP27 | 516 | Lakenheath |
| IP28 | 890 | Mildenhall |
| IP29 | 408 | Horringer |
| IP30 | 607 | Elmswell |
| IP31 | 793 | Thurston |
| IP32 | 458 | — |
| IP33 | 812 | Bury St Edmunds |
| IP98 | 7 | — |
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.