CM6 postcode district: Great Dunmow and around, Essex

CM6 is a postcode district in Essex, with 989 postcodes in use in 5 sectors. It has postcodes in Great Dunmow, Thaxted, Takeley and Little Canfield and 2 more places. It is split between 3 councils: Uttlesford (968 postcodes), Braintree (13) and Chelmsford (8).

Postcodes in use: 989
Sectors: 5
Councils: 3 councils
Places: 5 places

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. See all our data sources

Every postcode in CM6, and which are new since 2020

New since 2020: 100
In use before 2020: 889
Outline: where 5 or more new postcodes since 2020 lie together

Of the 989 postcodes in CM6 that ONS places, 100 are new since 2020 and 889 were in use before 2020.

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. New since 2020 means it came into use in January 2020 or later. A dashed outline shows where 5 or more lie within 180 metres of each other. It is not a boundary, and 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 51.8782, longitude 0.3653. Open this area on OpenStreetMap

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; when each came into use: the same directory; roads, rivers and built-up areas: 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. How we use them

The 5 newest postcodes

CM6 3ZPMay 2026 CM6 3ZQMay 2026 CM6 3ZTApril 2026 CM6 2GXMarch 2026 CM6 3ZHFebruary 2026

Where the new postcodes lie together

41 new postcodes since 2020, outlined on the map. CM6 4HE, is the newest of them.
9 new postcodes since 2020, outlined on the map. CM6 9EQ, is the newest of them.
9 new postcodes since 2020, outlined on the map. CM6 3ZP, is the newest of them.

What broadband can you get in CM6?

Ofcom reports on 909 of the 989 postcodes in CM6. At 620 of them every home and business can get gigabit broadband, and at 9 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit620 of 909

Postcodes where every home can get superfast809 of 909

Postcodes where some cannot get decent broadband9 of 909

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 checker

Source: Ofcom, Connected Nations, Spring 2026, data for January 2026, Open Government Licence v3.0. How we use it

Is CM6 at risk of flooding?

64 of the 989 postcodes in CM6 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 136 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 64 of 989 postcodes High: 54Medium: 82Low: 154Very low: 1

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, Risk of Flooding from Rivers and Sea (postcodes in areas at risk), published 6 July 2026, Open Government Licence v3.0. How we use it

What do homes sell for in CM6?

Homes in CM6 sold for a typical £446,250 in the 12 months to August 2026, across 404 sales, down 2.8% on the 12 months before, HM Land Registry's figures show.

£446,250 typical price, the 12 months to August 2026

£458,998 12 months to August 2025

▼ down 2.8% on the 12 months before

Detached £575,000 203 sales
Semi-detached £405,000 91 sales
Terraced £352,500 78 sales
Flat or maisonette £205,000 32 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 September 2026. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0. How we use it