County Durham has been allocated the following number ranges to use for Unique Street Reference Numbers
| USRN From |
USRN To |
| 11000000 |
11099999 |
| 11600000 |
11699999 |
| 11700000 |
11799999 |
| 11900000 |
11999999 |
| 33900000 |
33999999 |
| 39700000 |
39799999 |
| 42800000 |
42899999 |
| 7000000 |
7099999 |
| 81200000 |
81299999 |
Streets within the area of County Durham fall within the following post towns.
Click a town to expand the list of streets. Click again to close. Use the Search Box to filter the list.