| Area/District | Active Postcodes |
| CF1 | 2,303 |
| CF10 | 1,174 |
| CF11 | 1,453 |
| CF14 | 2,210 |
| CF15 | 650 |
| CF2 | 1,899 |
| CF21 | 1 |
| CF23 | 1,233 |
| CF24 | 1,445 |
| CF3 | 1,947 |
| CF30 | 95 |
| CF31 | 1,522 |
| CF32 | 902 |
| CF33 | 355 |
| CF34 | 492 |
| CF35 | 545 |
| CF36 | 553 |
| CF37 | 1,199 |
| CF38 | 525 |
| CF39 | 657 |
| CF4 | 2,324 |
| CF40 | 638 |
| CF41 | 281 |
| CF42 | 382 |
| CF43 | 319 |
| CF44 | 1,202 |
| CF45 | 491 |
| CF46 | 399 |
| CF47 | 816 |
| CF48 | 892 |
| CF5 | 1,884 |
| CF6 | 2,264 |
| CF61 | 267 |
| CF62 | 1,104 |
| CF63 | 701 |
| CF64 | 1,261 |
| CF7 | 791 |
| CF71 | 410 |
| CF72 | 832 |
| CF8 | 1,660 |
| CF81 | 427 |
| CF82 | 591 |
| CF83 | 1,480 |
| CF91 | 20 |
| CF95 | 7 |
| CF99 | 2 |