CO3 postcode district: Colchester and around, Essex
CO3 is a postcode district in Essex, with 864 postcodes in use in 5 sectors. It has postcodes in Colchester. Its council is Colchester.
- Postcodes in use
- 864
- Sectors
- 5
- Council
- Colchester
- Places
- Colchester
Source: ONS Postcode Directory, August 2026, loaded 20 October 2026.
Every postcode in CO3, by gigabit broadband
- No home or business can get gigabit: 59
- Some can get gigabit: 123
- Every home and business can get gigabit: 673
- Ofcom gives no figure: 9
Of the 864 postcodes in CO3 that ONS places, 59 have no home or business that can get gigabit, 123 have some that can, 673 can all get it and 9 have no Ofcom figure.
Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. No boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode.
The middle of its postcodes: latitude 51.8847, longitude 0.8555. Open this area on OpenStreetMap
Sources: ONS Postcode Directory, August 2026, loaded 20 October 2026; Ofcom Connected Nations, Connected Nations, Spring 2026; roads, rivers and built-up areas: Ordnance Survey open maps. Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre.
What broadband can you get in CO3?
Ofcom reports on 855 of the 864 postcodes in CO3. At 673 of them every home and business can get gigabit broadband.
Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.
Check one address on Ofcom's checkerSource: Ofcom Connected Nations, Connected Nations, Spring 2026, data for January 2026.
Is CO3 at risk of flooding?
17 of the 864 postcodes in CO3 have a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts 48 homes and businesses in an area at high or medium risk.
High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.
Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.
Source: Environment Agency flood risk, published 6 July 2026.
What do homes sell for in CO3?
Homes in CO3 sold for a typical £350,000 in the 12 months to September 2026, across 439 sales, HM Land Registry's figures show. The 12 months before gave £355,000 from 558 sales: not a change larger than chance would explain, given which homes happened to sell.
- Detached £450,000 161 sales
- Semi-detached £335,000 136 sales
- Terraced £292,750 70 sales
- Flat or maisonette £175,000 72 sales
Each bar is that kind's typical price, against the most expensive kind here.
Standard sales of homes at market value. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.
Source: HM Land Registry Price Paid Data, files dated 28 October 2026.
Postcodes in CO3
Pick a sector, then a postcode. A sector is the district plus the next digit.
UK postcode format explainedPlaces in CO3
Towns and villages with postcodes in CO3, and how many each has here.
Who covers CO3
How many of the district's postcodes in use fall under each council, constituency and police force area.
Councils
- Colchester864
Constituencies
- Colchester524
- Witham301
- Harwich and North Essex39
Police force areas
- Essex864
Next to CO3
"Next to" is by number: the districts before and after CO3 in the CO area.
Check a postcode
Where the facts on this page come from
- Office for National Statistics: ONS Postcode Directory
- Ofcom Connected Nations
- Environment Agency flood risk
- HM Land Registry Price Paid Data
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0.
Licence: Open Government Licence v3.0.
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