CO3 postcode district
CO3 holds 864 live postcodes around Colchester, in Colchester.
No listed town or village has its centre in CO3; the nearest are on the neighbouring districts below.
Wards
| Name | Share of postcodes |
|---|---|
| Prettygate | 29% |
| Stanway | 27% |
| Lexden and Braiswick | 16% |
| New Town and Christ Church | 12% |
| Marks Tey and Layer | 8% |
| Castle | 7% |
| Shrub End | 1% |
Westminster constituencies
| Name | Share of postcodes |
|---|---|
| Colchester | 61% |
| Witham | 35% |
| Harwich and North Essex | 5% |
Deprivation
The middle postcode here sits in decile 8 of the English Index of Multiple Deprivation (2021-Census LSOAs), where decile 1 is the most deprived tenth of neighbourhoods and 10 the least. 2% of this district's postcodes sit in the most deprived three deciles, 58% 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 CO area
CO1 · CO2 · CO4 · CO5 · CO6 · CO7 · CO8 · CO9 · CO10 · CO11 · CO12 · CO13 · CO14 · CO15 · CO16
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.