| Area/District | Active Postcodes |
| S1 | 1,446 |
| S10 | 1,462 |
| S11 | 1,079 |
| S12 | 838 |
| S13 | 692 |
| S14 | 208 |
| S17 | 547 |
| S18 | 1,375 |
| S19 | 567 |
| S2 | 1,500 |
| S20 | 847 |
| S21 | 508 |
| S25 | 633 |
| S26 | 606 |
| S3 | 833 |
| S30 | 1,717 |
| S31 | 1,253 |
| S32 | 268 |
| S33 | 211 |
| S35 | 1,037 |
| S36 | 904 |
| S4 | 454 |
| S40 | 1,639 |
| S41 | 1,237 |
| S42 | 906 |
| S43 | 1,266 |
| S44 | 718 |
| S45 | 534 |
| S49 | 29 |
| S5 | 1,244 |
| S6 | 1,742 |
| S60 | 1,602 |
| S61 | 1,005 |
| S62 | 736 |
| S63 | 1,431 |
| S64 | 811 |
| S65 | 990 |
| S66 | 1,632 |
| S69 | 1 |
| S7 | 450 |
| S70 | 1,827 |
| S71 | 1,400 |
| S72 | 827 |
| S73 | 898 |
| S74 | 580 |
| S75 | 1,547 |
| S8 | 1,302 |
| S80 | 1,334 |
| S81 | 1,240 |
| S9 | 1,240 |
| S94 | 2 |
| S95 | 45 |
| S96 | 30 |
| S97 | 48 |
| S98 | 322 |
| S99 | 43 |