WA
18 districts, 18,334 postcodes
Warrington, St. Helens, Halton, Trafford, Cheshire East, Cheshire West and Chester, and others
| District | Postcodes | Local authority |
|---|---|---|
| WA1 | 775 | Warrington |
| WA10 | 1,274 | St. Helens |
| WA11 | 1,029 | St. Helens |
| WA12 | 647 | St. Helens |
| WA13 | 492 | Warrington |
| WA14 | 1,130 | Trafford |
| WA15 | 1,184 | Trafford |
| WA16 | 1,199 | Cheshire East |
| WA2 | 923 | Warrington |
| WA3 | 1,518 | Warrington |
| WA4 | 1,437 | Warrington |
| WA5 | 1,320 | Warrington |
| WA55 | 8 | Warrington |
| WA6 | 974 | Cheshire West and Chester |
| WA7 | 1,518 | Halton |
| WA8 | 1,587 | Halton |
| WA88 | 13 | Halton |
| WA9 | 1,306 | St. Helens |