TS21 postcode district
TS21 holds 545 live postcodes around Sedgefield, in County Durham, Stockton-on-Tees, Darlington.
Towns and villages with their centre in TS21
| # | Place | County / council | Population |
|---|---|---|---|
| 1 | Sedgefield | County Durham | 4,456 |
| 2 | Fishburn | County Durham | 2,588 |
| 3 | Stillington | Stockton-on-Tees | 1,210 |
| 4 | Carlton | Stockton-on-Tees | 726 |
Wards
| Name | Share of postcodes |
|---|---|
| Sedgefield | 55% |
| Northern Parishes | 23% |
| Eaglescliffe West | 8% |
| Sadberge & Middleton St George | 6% |
| Hartburn | 3% |
| Hardwick & Salters Lane | 1% |
| Roseworth | 1% |
| Fairfield | 1% |
| Bishopsgarth & Elm Tree | 0% |
| Newtown | 0% |
And 1 more.
Westminster constituencies
| Name | Share of postcodes |
|---|---|
| Newton Aycliffe and Spennymoor | 56% |
| Stockton West | 35% |
| Stockton North | 9% |
Deprivation
The middle postcode here sits in decile 7 of the English Index of Multiple Deprivation (2021-Census LSOAs), where decile 1 is the most deprived tenth of neighbourhoods and 10 the least. 24% of this district's postcodes sit in the most deprived three deciles, 39% in the least deprived three.
Deprivation deciles describe the LSOA neighbourhood each postcode sits in, weighted by postcodes rather than by people, because the postcode file carries no population. A district where the deprived neighbourhoods are densely populated will read better here than it would per resident.
Neighbouring districts in the TS area
TS1 · TS2 · TS3 · TS4 · TS5 · TS6 · TS7 · TS8 · TS9 · TS10 · TS11 · TS12 · TS13 · TS14 · TS15 · TS16 · TS17 · TS18 · TS19 · TS20 · TS22 · TS23 · TS24 · TS25 · TS26 · TS27 · TS28 · TS29
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v3.0. Postcode data is the ONS Postcode Directory, August 2026 edition; counts are live postcodes with a usable location. Northern Ireland postcodes carry a separate licence and are not included; Scotland joins when the site's Scottish coverage does.