CM3 4 postcode sector in the CM3 district

CM3 4 is a sector of the CM3 district: every postcode that starts CM3 4. It has 244 postcodes in use.

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

Every postcode in the CM3 4 sector, and which are new since 2020

Map of every postcode in the CM3 4 sector, by new since 2020 Of the 244 postcodes in the CM3 4 sector that ONS places, 5 are new since 2020 and 239 were in use before 2020. Places named: Chelmsford, South Woodham Ferrers, Danbury, Galleywood. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A130A12A138A132 CM3 4AA: before 2020CM3 4AB: before 2020CM3 4AE: before 2020CM3 4AF: before 2020CM3 4AG: before 2020CM3 4AJ: before 2020CM3 4AL: before 2020CM3 4AN: before 2020CM3 4AP: before 2020CM3 4AQ: before 2020CM3 4AR: before 2020CM3 4AT: before 2020CM3 4AU: before 2020CM3 4AX: before 2020CM3 4AY: before 2020CM3 4AZ: before 2020CM3 4BA: before 2020CM3 4BB: before 2020CM3 4BD: before 2020CM3 4BE: before 2020CM3 4BG: before 2020CM3 4BH: before 2020CM3 4BJ: before 2020CM3 4BL: before 2020CM3 4BN: before 2020CM3 4BP: before 2020CM3 4BQ: before 2020CM3 4BS: before 2020CM3 4BT: before 2020CM3 4BU: before 2020CM3 4BW: before 2020CM3 4BX: before 2020CM3 4BY: before 2020CM3 4BZ: before 2020CM3 4DA: before 2020CM3 4DB: before 2020CM3 4DD: before 2020CM3 4DE: before 2020CM3 4DH: before 2020CM3 4DJ: before 2020CM3 4DL: before 2020CM3 4DN: before 2020CM3 4DP: before 2020CM3 4DR: before 2020CM3 4DS: before 2020CM3 4DT: before 2020CM3 4DU: before 2020CM3 4DW: before 2020CM3 4DX: before 2020CM3 4DY: before 2020CM3 4DZ: before 2020CM3 4EB: before 2020CM3 4ED: before 2020CM3 4EE: before 2020CM3 4EF: before 2020CM3 4EG: before 2020CM3 4EH: before 2020CM3 4EJ: before 2020CM3 4EP: before 2020CM3 4EQ: before 2020CM3 4ER: before 2020CM3 4ES: before 2020CM3 4ET: before 2020CM3 4EU: before 2020CM3 4EX: before 2020CM3 4EY: before 2020CM3 4EZ: before 2020CM3 4FA: before 2020CM3 4FG: before 2020CM3 4FH: before 2020CM3 4FJ: before 2020CM3 4FL: before 2020CM3 4HA: before 2020CM3 4HB: before 2020CM3 4HD: before 2020CM3 4HF: before 2020CM3 4HG: before 2020CM3 4HH: before 2020CM3 4HJ: before 2020CM3 4HL: before 2020CM3 4HN: before 2020CM3 4HP: before 2020CM3 4HQ: before 2020CM3 4HT: before 2020CM3 4HU: before 2020CM3 4HW: before 2020CM3 4HX: before 2020CM3 4HY: before 2020CM3 4HZ: before 2020CM3 4JA: before 2020CM3 4JE: before 2020CM3 4JF: before 2020CM3 4JG: before 2020CM3 4JH: before 2020CM3 4JJ: before 2020CM3 4JL: before 2020CM3 4JN: before 2020CM3 4JP: before 2020CM3 4JQ: before 2020CM3 4JR: before 2020CM3 4JS: before 2020CM3 4JW: before 2020CM3 4LA: before 2020CM3 4LB: before 2020CM3 4LD: before 2020CM3 4LE: before 2020CM3 4LF: before 2020CM3 4LH: before 2020CM3 4LJ: before 2020CM3 4LL: before 2020CM3 4LN: before 2020CM3 4LP: before 2020CM3 4LR: before 2020CM3 4LS: before 2020CM3 4LT: before 2020CM3 4LU: before 2020CM3 4LW: before 2020CM3 4LX: before 2020CM3 4LZ: before 2020CM3 4NA: before 2020CM3 4NB: before 2020CM3 4ND: before 2020CM3 4NE: before 2020CM3 4NG: before 2020CM3 4NL: before 2020CM3 4NN: before 2020CM3 4NP: before 2020CM3 4NQ: before 2020CM3 4NS: before 2020CM3 4NT: before 2020CM3 4NU: before 2020CM3 4NW: before 2020CM3 4NX: before 2020CM3 4NY: before 2020CM3 4NZ: before 2020CM3 4PB: before 2020CM3 4PD: before 2020CM3 4PE: before 2020CM3 4PF: before 2020CM3 4PG: before 2020CM3 4PH: before 2020CM3 4PJ: before 2020CM3 4PL: before 2020CM3 4PN: before 2020CM3 4PP: before 2020CM3 4PQ: before 2020CM3 4PR: before 2020CM3 4PT: before 2020CM3 4QB: before 2020CM3 4QE: before 2020CM3 4QH: before 2020CM3 4QJ: before 2020CM3 4QL: before 2020CM3 4QN: before 2020CM3 4QP: before 2020CM3 4QR: before 2020CM3 4QS: before 2020CM3 4QT: before 2020CM3 4QU: before 2020CM3 4QW: before 2020CM3 4QX: before 2020CM3 4QY: before 2020CM3 4QZ: before 2020CM3 4RA: before 2020CM3 4RB: before 2020CM3 4RD: before 2020CM3 4RE: before 2020CM3 4RF: before 2020CM3 4RH: before 2020CM3 4RJ: before 2020CM3 4RL: before 2020CM3 4RN: before 2020CM3 4RP: before 2020CM3 4RQ: before 2020CM3 4RS: before 2020CM3 4RT: before 2020CM3 4RU: before 2020CM3 4RX: before 2020CM3 4RY: before 2020CM3 4RZ: before 2020CM3 4SA: before 2020CM3 4SB: before 2020CM3 4SD: before 2020CM3 4SE: before 2020CM3 4SF: before 2020CM3 4SG: before 2020CM3 4SH: before 2020CM3 4SN: before 2020CM3 4SP: before 2020CM3 4SQ: before 2020CM3 4SR: before 2020CM3 4SS: before 2020CM3 4ST: before 2020CM3 4SU: before 2020CM3 4SX: before 2020CM3 4SY: before 2020CM3 4SZ: before 2020CM3 4TA: before 2020CM3 4TB: before 2020CM3 4TD: before 2020CM3 4TE: before 2020CM3 4TG: before 2020CM3 4TH: before 2020CM3 4TJ: before 2020CM3 4TL: before 2020CM3 4TN: before 2020CM3 4TP: before 2020CM3 4TQ: before 2020CM3 4TR: before 2020CM3 4TS: before 2020CM3 4TW: before 2020CM3 4UE: before 2020CM3 4UJ: before 2020CM3 4XA: before 2020CM3 4XB: before 2020CM3 4XD: before 2020CM3 4XG: before 2020CM3 4XH: before 2020CM3 4XL: before 2020CM3 4XW: before 2020CM3 4XY: before 2020CM3 4AW: new since 2020CM3 4FP: new since 2020CM3 4FQ: new since 2020CM3 4FS: new since 2020CM3 4JB: new since 2020 ChelmsfordSouth Woodham FerrersDanburyGalleywood Map of every postcode in the CM3 4 sector, by new since 2020 Of the 244 postcodes in the CM3 4 sector that ONS places, 5 are new since 2020 and 239 were in use before 2020. Places named: Chelmsford, South Woodham Ferrers, Danbury. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A130A138 ChelmsfordSouth Woodham FerrersDanbury
  • New since 2020: 5
  • In use before 2020: 239

Of the 244 postcodes in the CM3 4 sector that ONS places, 5 are new since 2020 and 239 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. No boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode.

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

CM3 4AWAugust 2024CM3 4FQOctober 2023CM3 4JBFebruary 2023CM3 4FSOctober 2022CM3 4FPDecember 2021

What do homes sell for in CM3 4?

Homes in CM3 4 sold for a typical £552,500 in the 12 months to August 2026, across 92 sales, down 2.2% on the 12 months before, HM Land Registry's figures show.

£552,500 typical price, the 12 months to August 2026
£565,000 12 months to August 2025
▼ down 2.2% on the 12 months before
  • Detached £650,000 57 sales
  • Semi-detached £437,500 24 sales
  • Terraced £373,000 8 sales
  • Flat or maisonette 3 sales, too few to price

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 4. 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 4

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.

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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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