Districts in the DL area
| District | Main place | Local authority | Sectors | Postcodes |
|---|---|---|---|---|
| DL1 | Darlington | Darlington | 6 | 1,411 |
| DL2 | Middleton St George | Darlington | 4 | 848 |
| DL3 | Darlington | Darlington | 5 | 1,152 |
| DL4 | Shildon | County Durham | 2 | 302 |
| DL5 | Newton Aycliffe | County Durham | 5 | 802 |
| DL6 | Northallerton | North Yorkshire | 3 | 686 |
| DL7 | Northallerton | North Yorkshire | 4 | 751 |
| DL8 | Bedale | North Yorkshire | 6 | 1,169 |
| DL9 | Catterick Garrison | North Yorkshire | 2 | 398 |
| DL10 | Richmond | North Yorkshire | 5 | 842 |
| DL11 | Reeth | North Yorkshire | 2 | 453 |
| DL12 | Barnard Castle | County Durham | 4 | 726 |
| DL13 | Stanhope | County Durham | 5 | 961 |
| DL14 | Bishop Auckland | County Durham | 6 | 1,189 |
| DL15 | Crook | County Durham | 3 | 708 |
| DL16 | Spennymoor | County Durham | 3 | 612 |
| DL17 | Ferryhill | County Durham | 3 | 539 |
| DL98 | Darlington | Darlington | 1 | 6 |
Main places in the DL area
- Darlington
- Newton Aycliffe
- Bishop Auckland
- Spennymoor
- Northallerton
- Catterick Garrison
- Richmond
- Shildon
- Crook
- Ferryhill
- Barnard Castle
- Middleton St George
- Willington
- Bedale
- Leyburn
- Chilton
- Stanhope
- Hurworth-on-Tees
- Romanby
- Wolsingham
- Cornforth
- Tow Law
- West Auckland
- Coundon
- Catterick
- Leeming Bar
- Aiskew
- Staindrop
- Cockfield
- Evenwood