Sectors in DL1
| Sector | Main place | Postcodes |
|---|---|---|
| DL1 1 | Darlington | 238 |
| DL1 2 | Darlington | 290 |
| DL1 3 | Darlington | 236 |
| DL1 4 | Darlington | 283 |
| DL1 5 | Darlington | 178 |
| DL1 9 | Darlington | 186 |
Places covered by DL1
- Darlington Darlington · 1,369
- Coatham Mundeville Darlington · 5
- Beaumont Hill Darlington · 4
- Barmpton Darlington · 2
- Brafferton Darlington · 2
- Newton Ketton Darlington · 1