Sectors in DL3
| Sector | Main place | Postcodes |
|---|---|---|
| DL3 0 | Darlington | 316 |
| DL3 6 | Darlington | 189 |
| DL3 7 | Darlington | 166 |
| DL3 8 | Darlington | 219 |
| DL3 9 | Darlington | 262 |
Places covered by DL3
- Darlington Darlington · 1,141
- Whessoe Darlington · 2
- Coatham Mundeville Darlington · 1