Districts in the IP area
| District | Main place | Local authority | Sectors | Postcodes |
|---|---|---|---|---|
| IP1 | Ipswich | Ipswich | 7 | 1,111 |
| IP2 | Ipswich | Ipswich | 3 | 717 |
| IP3 | Ipswich | Ipswich | 3 | 765 |
| IP4 | Ipswich | Ipswich | 5 | 946 |
| IP5 | Kesgrave | East Suffolk | 4 | 460 |
| IP6 | Needham Market | Mid Suffolk | 3 | 789 |
| IP7 | Hadleigh | Babergh | 4 | 718 |
| IP8 | Ipswich | Babergh | 2 | 485 |
| IP9 | Capel St Mary | Babergh | 2 | 496 |
| IP10 | Kirton | East Suffolk | 1 | 191 |
| IP11 | Felixstowe | East Suffolk | 8 | 974 |
| IP12 | Woodbridge | East Suffolk | 5 | 1,057 |
| IP13 | Framlingham | East Suffolk | 5 | 1,183 |
| IP14 | Stowmarket | Mid Suffolk | 7 | 1,626 |
| IP15 | Aldeburgh | East Suffolk | 1 | 165 |
| IP16 | Leiston | East Suffolk | 1 | 324 |
| IP17 | Saxmundham | East Suffolk | 4 | 733 |
| IP18 | Southwold | East Suffolk | 1 | 295 |
| IP19 | Halesworth | East Suffolk | 4 | 598 |
| IP20 | Harleston | South Norfolk | 2 | 323 |
| IP21 | Stradbroke | Mid Suffolk | 2 | 530 |
| IP22 | Diss | South Norfolk | 5 | 871 |
| IP23 | Eye | Mid Suffolk | 3 | 340 |
| IP24 | Thetford | Breckland | 4 | 790 |
| IP25 | Watton | Breckland | 3 | 633 |
| IP26 | Feltwell | King's Lynn and West Norfolk | 2 | 340 |
| IP27 | Brandon | West Suffolk | 3 | 516 |
| IP28 | Mildenhall | West Suffolk | 7 | 890 |
| IP29 | Barrow | West Suffolk | 2 | 408 |
| IP30 | Elmswell | Mid Suffolk | 2 | 607 |
| IP31 | Thurston | West Suffolk | 3 | 793 |
| IP32 | Bury St Edmunds | West Suffolk | 2 | 458 |
| IP33 | Bury St Edmunds | West Suffolk | 4 | 812 |
| IP98 | Diss | South Norfolk | 2 | 7 |