| District | Post Town | Coverage | Postcodes |
|---|---|---|---|
| DT1 | Dorchester | Dorchester | 781 |
| DT2 | Dorchester | Dorchester | 1,134 |
| DT3 | Weymouth | Weymouth | 699 |
| DT4 | Weymouth | Weymouth | 996 |
| DT5 | Portland | Portland | 318 |
| DT6 | Bridport | Bridport | 1,004 |
| DT7 | Lyme Regis | Lyme Regis | 284 |
| DT8 | Beaminster | Beaminster | 234 |
| DT9 | Sherborne | Sherborne | 915 |
| DT10 | Sturminster Newton | Sturminster Newton | 470 |
| DT11 | Blandford Forum | Blandford Forum | 1,079 |