DH
12 districts, 9,172 postcodes
County Durham, Sunderland, Gateshead, Northumberland
| District | Postcodes | Local authority |
|---|
| DH1 | 1,332 | County Durham |
| DH2 | 712 | County Durham |
| DH3 | 769 | County Durham |
| DH4 | 963 | Sunderland |
| DH5 | 554 | Sunderland |
| DH6 | 1,039 | County Durham |
| DH7 | 1,261 | County Durham |
| DH8 | 1,328 | County Durham |
| DH9 | 1,209 | County Durham |
| DH97 | 1 | County Durham |
| DH98 | 1 | County Durham |
| DH99 | 3 | County Durham |