Districts in the CH area
| District | Main place | Local authority | Sectors | Postcodes |
|---|---|---|---|---|
| CH1 | Chester | Cheshire West and Chester | 7 | 1,053 |
| CH2 | Chester | Cheshire West and Chester | 4 | 851 |
| CH3 | Chester | Cheshire West and Chester | 5 | 1,112 |
| CH4 | Chester | Cheshire West and Chester | 4 | 922 |
| CH5 | Connah's Quay | Flintshire | 5 | 1,172 |
| CH6 | Flint | Flintshire | 3 | 443 |
| CH7 | Buckley | Flintshire | 7 | 1,586 |
| CH8 | Holywell | Flintshire | 3 | 680 |
| CH25 | Birkenhead | Wirral | 1 | 36 |
| CH26 | Birkenhead | Wirral | 1 | 6 |
| CH27 | Wallasey | Wirral | 1 | 21 |
| CH28 | Wallasey | Wirral | 1 | 4 |
| CH29 | Hoylake | Wirral | 1 | 20 |
| CH30 | Birkenhead | Wirral | 1 | 1 |
| CH31 | Heswall | Wirral | 1 | 7 |
| CH32 | Bebington | Wirral | 1 | 14 |
| CH33 | Neston | Cheshire West and Chester | 1 | 8 |
| CH34 | Ellesmere Port | Cheshire West and Chester | 1 | 60 |
| CH41 | Birkenhead | Wirral | 10 | 789 |
| CH42 | Birkenhead | Wirral | 10 | 688 |
| CH43 | Birkenhead | Wirral | 10 | 934 |
| CH44 | Wallasey | Wirral | 10 | 772 |
| CH45 | Wallasey | Wirral | 10 | 758 |
| CH46 | Wallasey | Wirral | 10 | 593 |
| CH47 | Hoylake | Wirral | 10 | 343 |
| CH48 | West Kirby | Wirral | 10 | 502 |
| CH49 | Birkenhead | Wirral | 10 | 673 |
| CH60 | Heswall | Wirral | 10 | 461 |
| CH61 | Heswall | Wirral | 10 | 418 |
| CH62 | Bebington | Wirral | 10 | 820 |
| CH63 | Bebington | Wirral | 10 | 822 |
| CH64 | Neston | Cheshire West and Chester | 10 | 643 |
| CH65 | Ellesmere Port | Cheshire West and Chester | 10 | 820 |
| CH66 | Ellesmere Port | Cheshire West and Chester | 10 | 997 |
| CH70 | Chester | Cheshire West and Chester | 1 | 42 |
| CH88 | Chester | Cheshire West and Chester | 1 | 1 |
| CH99 | Chester | Cheshire West and Chester | 1 | 17 |