SL3 postcode district
SL3 holds 1,077 live postcodes around Colnbrook, in Slough, Windsor and Maidenhead, Buckinghamshire.
Towns and villages with their centre in SL3
| # | Place | County / council | Population |
|---|---|---|---|
| 1 | Colnbrook | Slough | 5,528 |
| 2 | Datchet | Royal Borough of Windsor and Maidenhead | 4,913 |
| 3 | Horton | Royal Borough of Windsor and Maidenhead | 1,033 |
| 4 | George Green | Buckinghamshire | 990 |
| 5 | Wexham Street | Buckinghamshire | 670 |
| 6 | Fulmer | Buckinghamshire | 230 |
Wards
| Name | Share of postcodes |
|---|---|
| Colnbrook & Poyle | 21% |
| "Datchet | 16% |
| Farnhams & Stoke Poges | 11% |
| Langley Marish | 11% |
| Upton | 10% |
| Langley Foxborough | 10% |
| Langley St Mary's | 9% |
| Langley Meads | 9% |
| Slough Central | 2% |
| Wexham Court | 1% |
And 1 more.
Westminster constituencies
| Name | Share of postcodes |
|---|---|
| Windsor | 57% |
| Slough | 32% |
| Beaconsfield | 12% |
Deprivation
The middle postcode here sits in decile 6 of the English Index of Multiple Deprivation (2021-Census LSOAs), where decile 1 is the most deprived tenth of neighbourhoods and 10 the least. 9% of this district's postcodes sit in the most deprived three deciles, 20% 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 SL area
SL0 · SL1 · SL2 · SL4 · SL5 · SL6 · SL7 · SL8 · SL9 · SL60 · SL95
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.