Sectors in TS21
| Sector | Main place | Postcodes |
|---|---|---|
| TS21 1 | Stillington | 203 |
| TS21 2 | Sedgefield | 110 |
| TS21 3 | Sedgefield | 150 |
| TS21 4 | Fishburn | 82 |
Places covered by TS21
- Sedgefield County Durham · 151
- Fishburn County Durham · 74
- Stillington Stockton-on-Tees · 34
- Stockton-on-Tees Stockton-on-Tees · 31
- Long Newton Stockton-on-Tees · 25
- Carlton Stockton-on-Tees · 22
- Thorpe Thewles Stockton-on-Tees · 19
- Redmarshall Stockton-on-Tees · 13
- Bishopton Darlington · 11
- Whitton Stockton-on-Tees · 6
- Mordon County Durham · 5
- Butterwick County Durham · 2
- Elton Stockton-on-Tees · 2
- Great Stainton Darlington · 2
- Bradbury County Durham · 1
- Elstob County Durham · 1
- Foxton County Durham · 1
- Grindon Stockton-on-Tees · 1
- Little Stainton Darlington · 1
- Old Stillington Stockton-on-Tees · 1
- Thorpe Larches County Durham · 1