Districts in the CB area
| District | Main place | Local authority | Sectors | Postcodes |
|---|---|---|---|---|
| CB1 | Cambridge | Cambridge | 7 | 1,159 |
| CB2 | Cambridge | Cambridge | 6 | 588 |
| CB3 | Cambridge | Cambridge | 3 | 418 |
| CB4 | Cambridge | Cambridge | 4 | 903 |
| CB5 | Cambridge | Cambridge | 1 | 279 |
| CB6 | Ely | East Cambridgeshire | 3 | 923 |
| CB7 | Ely | East Cambridgeshire | 5 | 752 |
| CB8 | Newmarket | West Suffolk | 5 | 1,074 |
| CB9 | Haverhill | West Suffolk | 5 | 843 |
| CB10 | Saffron Walden | Uttlesford | 3 | 577 |
| CB11 | Saffron Walden | Uttlesford | 2 | 550 |
| CB21 | Linton | South Cambridgeshire | 3 | 446 |
| CB22 | Sawston | South Cambridgeshire | 5 | 611 |
| CB23 | Cambourne | South Cambridgeshire | 8 | 883 |
| CB24 | Cottenham | South Cambridgeshire | 7 | 818 |
| CB25 | Burwell | East Cambridgeshire | 2 | 428 |