CM3 7 postcode sector in the CM3 district

CM3 7 is a sector of the CM3 district: every postcode that starts CM3 7. It has 25 postcodes in use, one of them a large-user postcode. A large-user postcode is one Royal Mail gives to a single address that gets a lot of mail.

Not sure what a sector is? UK postcode format explained.

Every postcode in the CM3 7 sector, by flood risk

Map of every postcode in the CM3 7 sector, by flood risk Of the 25 postcodes in the CM3 7 sector that ONS places, 3 have a home or business at high risk, 1 are at medium risk at worst, 1 are at low risk at worst and 20 are not on the Environment Agency's at-risk list. One postcode lies beyond the edge and is listed under the map. Places named: South Woodham-Chetwood and Collingwood. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. CM3 7AB: not on the flood risk listCM3 7AE: not on the flood risk listCM3 7AF: not on the flood risk listCM3 7AG: not on the flood risk listCM3 7AH: not on the flood risk listCM3 7AJ: not on the flood risk listCM3 7AN: not on the flood risk listCM3 7AP: not on the flood risk listCM3 7AQ: not on the flood risk listCM3 7AR: not on the flood risk listCM3 7AS: not on the flood risk listCM3 7AU: not on the flood risk listCM3 7AY: not on the flood risk listCM3 7BB: not on the flood risk listCM3 7BD: not on the flood risk listCM3 7BE: not on the flood risk listCM3 7BF: not on the flood risk listCM3 7BL: not on the flood risk listCM3 7BR: not on the flood risk listCM3 7AZ: low flood risk at worstCM3 7AW: medium flood risk at worstCM3 7AD: high flood riskCM3 7AL: high flood riskCM3 7BG: high flood risk South Woodham-Chetwood and Collingwood Map of every postcode in the CM3 7 sector, by flood risk Of the 25 postcodes in the CM3 7 sector that ONS places, 3 have a home or business at high risk, 1 are at medium risk at worst, 1 are at low risk at worst and 20 are not on the Environment Agency's at-risk list. One postcode lies beyond the edge and is listed under the map. Places named: South Woodham-Chetwood and Collingwood. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. South Woodham-Chetwood and Collingwood
  • A home or business at high risk: 3
  • At medium risk at worst: 1
  • At low risk at worst: 1
  • At very low risk only: 0
  • Not on the at-risk list: 20

Of the 25 postcodes in the CM3 7 sector that ONS places, 3 have a home or business at high risk, 1 are at medium risk at worst, 1 are at low risk at worst and 20 are not on the Environment Agency's at-risk list.

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. Names in italics are council wards: we hold no town or village names here.

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; flood risk: Environment Agency, published 6 July 2026; 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 postcodes at high risk

Beside each: how many of its homes and businesses the Environment Agency puts at that risk.

CM3 7AL2 at high riskCM3 7AD1 at high riskCM3 7BG1 at high risk

Further out, not drawn

This postcode lies well apart from the rest, so the map is drawn without it to show the rest closer; it is in every count.

CM3 7AT

What do homes sell for in CM3 7?

Homes in CM3 7 sold for a typical £430,000 in the 12 months to August 2026, across 13 sales, down 9.5% on the 12 months before, HM Land Registry's figures show.

£430,000 typical price, the 12 months to August 2026
£475,000 12 months to August 2025
▼ down 9.5% on the 12 months before
  • Detached £545,000 7 sales
  • Terraced £355,000 6 sales

Each bar is that kind's typical price, against the most expensive kind here.

Standard sales of homes at market value at the postcodes that start CM3 7. A typical price is the median, the middle sale, given from 5 sales or more.

How we work this out: house prices by postcode

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

Postcodes in CM3 7

Pick a postcode to see its council and MP, broadband, flood risk, what homes sell for, council tax, the nearest schools and stations, and crime around it.

CM3 7ABCM3 7ADCM3 7AECM3 7AFCM3 7AGCM3 7AHCM3 7AJCM3 7ALCM3 7ANCM3 7APCM3 7AQCM3 7ARCM3 7ASCM3 7ATCM3 7AUCM3 7AWCM3 7AYCM3 7AZCM3 7BBCM3 7BDCM3 7BECM3 7BFCM3 7BGCM3 7BLCM3 7BR

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. Postcodes that have ended are not listed. See all our data sources

What council am I in? The council, borough or local authority for a postcode, and the county council where there is one. What ward am I in? The ward for a postcode, with its council, constituency and parish.

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