DL - Darlington
The postal area DL (Darlington) comprises of the following post towns; these towns should be written in capital letters when used in addresses.
Postal Districts within DL - Darlington
| Country | Post Town | Postal District |
| England | Darlington | DL1 DL2 DL3 |
| Shildon | DL4 | |
| Newton Aycliffe | DL5 | |
| Northallerton | DL6 DL7 |
|
| Bedale Leyburn Hawes |
DL8 | |
| Catterick Garrison | DL9 | |
| Richmond | DL10 DL11 |
|
| Barnard Castle | DL12 | |
| Bishop Auckland | DL13 DL14 |
|
| Crook | DL15 | |
| Spennymoor | DL16 | |
| Ferryhill | DL17 |
