IP
34 districts, 21,928 postcodes
East Suffolk, Mid Suffolk, West Suffolk, Ipswich, Babergh, Breckland, and others
| District | Postcodes | Local authority |
|---|---|---|
| IP1 | 1,111 | Ipswich |
| IP10 | 191 | East Suffolk |
| IP11 | 977 | East Suffolk |
| IP12 | 1,058 | East Suffolk |
| IP13 | 1,183 | East Suffolk |
| IP14 | 1,622 | Mid Suffolk |
| IP15 | 165 | East Suffolk |
| IP16 | 322 | East Suffolk |
| IP17 | 732 | East Suffolk |
| IP18 | 295 | East Suffolk |
| IP19 | 599 | East Suffolk |
| IP2 | 718 | Ipswich |
| IP20 | 324 | South Norfolk |
| IP21 | 530 | Mid Suffolk |
| IP22 | 870 | South Norfolk |
| IP23 | 339 | Mid Suffolk |
| IP24 | 792 | Breckland |
| IP25 | 632 | Breckland |
| IP26 | 339 | King's Lynn and West Norfolk |
| IP27 | 515 | West Suffolk |
| IP28 | 887 | West Suffolk |
| IP29 | 408 | West Suffolk |
| IP3 | 764 | Ipswich |
| IP30 | 601 | Mid Suffolk |
| IP31 | 790 | West Suffolk |
| IP32 | 457 | West Suffolk |
| IP33 | 814 | West Suffolk |
| IP4 | 946 | Ipswich |
| IP5 | 457 | East Suffolk |
| IP6 | 788 | Mid Suffolk |
| IP7 | 716 | Babergh |
| IP8 | 482 | Babergh |
| IP9 | 497 | Babergh |
| IP98 | 7 | South Norfolk |