| Area/District | Active Postcodes |
| YO1 | 2,279 |
| YO10 | 776 |
| YO11 | 1,164 |
| YO12 | 1,111 |
| YO13 | 459 |
| YO14 | 506 |
| YO15 | 697 |
| YO16 | 1,135 |
| YO17 | 1,285 |
| YO18 | 532 |
| YO19 | 566 |
| YO2 | 1,699 |
| YO21 | 796 |
| YO22 | 476 |
| YO23 | 691 |
| YO24 | 833 |
| YO25 | 2,225 |
| YO26 | 1,167 |
| YO3 | 2,400 |
| YO30 | 865 |
| YO31 | 1,039 |
| YO32 | 911 |
| YO4 | 1,571 |
| YO41 | 512 |
| YO42 | 815 |
| YO43 | 535 |
| YO5 | 531 |
| YO51 | 324 |
| YO6 | 1,580 |
| YO60 | 311 |
| YO61 | 745 |
| YO62 | 694 |
| YO7 | 1,145 |
| YO8 | 2,226 |
| YO90 | 18 |
| YO91 | 10 |
| YO95 | 1 |