CM1 3 postcode sector in the CM1 district

CM1 3 is a sector of the CM1 district: every postcode that starts CM1 3. It has 225 postcodes in use, 8 of them large-user postcodes. 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 CM1 3 sector, and which are new since 2020

Map of every postcode in the CM1 3 sector, by new since 2020 Of the 225 postcodes in the CM1 3 sector that ONS places, 1 are new since 2020 and 224 were in use before 2020. Places named: Chelmsford, Writtle. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2 km. A1114 CM1 3AA: before 2020CM1 3AE: before 2020CM1 3AF: before 2020CM1 3AG: before 2020CM1 3AR: before 2020CM1 3AX: before 2020CM1 3BB: before 2020CM1 3BH: before 2020CM1 3BJ: before 2020CM1 3BL: before 2020CM1 3BP: before 2020CM1 3BS: before 2020CM1 3BT: before 2020CM1 3BW: before 2020CM1 3BX: before 2020CM1 3BY: before 2020CM1 3BZ: before 2020CM1 3DB: before 2020CM1 3DD: before 2020CM1 3DF: before 2020CM1 3DG: before 2020CM1 3DH: before 2020CM1 3DJ: before 2020CM1 3DL: before 2020CM1 3DN: before 2020CM1 3DP: before 2020CM1 3DQ: before 2020CM1 3DR: before 2020CM1 3DS: before 2020CM1 3DT: before 2020CM1 3DU: before 2020CM1 3DX: before 2020CM1 3DZ: before 2020CM1 3EA: before 2020CM1 3EB: before 2020CM1 3ED: before 2020CM1 3EE: before 2020CM1 3EF: before 2020CM1 3EH: before 2020CM1 3EJ: before 2020CM1 3EN: before 2020CM1 3EP: before 2020CM1 3EQ: before 2020CM1 3ES: before 2020CM1 3ET: before 2020CM1 3EU: before 2020CM1 3EW: before 2020CM1 3EX: before 2020CM1 3EY: before 2020CM1 3EZ: before 2020CM1 3FE: before 2020CM1 3FF: before 2020CM1 3FH: before 2020CM1 3FJ: before 2020CM1 3FL: before 2020CM1 3GA: before 2020CM1 3GD: before 2020CM1 3GF: before 2020CM1 3GH: before 2020CM1 3GJ: before 2020CM1 3GL: before 2020CM1 3GN: before 2020CM1 3GP: before 2020CM1 3GR: before 2020CM1 3GS: before 2020CM1 3GY: before 2020CM1 3HB: before 2020CM1 3HD: before 2020CM1 3HE: before 2020CM1 3HF: before 2020CM1 3HG: before 2020CM1 3HH: before 2020CM1 3HJ: before 2020CM1 3HL: before 2020CM1 3HN: before 2020CM1 3HP: before 2020CM1 3HQ: before 2020CM1 3HT: before 2020CM1 3HY: before 2020CM1 3JA: before 2020CM1 3JB: before 2020CM1 3JE: before 2020CM1 3JF: before 2020CM1 3JG: before 2020CM1 3JH: before 2020CM1 3JJ: before 2020CM1 3JL: before 2020CM1 3JN: before 2020CM1 3JP: before 2020CM1 3JQ: before 2020CM1 3JS: before 2020CM1 3JT: before 2020CM1 3JU: before 2020CM1 3JY: before 2020CM1 3JZ: before 2020CM1 3LE: before 2020CM1 3LF: before 2020CM1 3LG: before 2020CM1 3LH: before 2020CM1 3LJ: before 2020CM1 3LN: before 2020CM1 3LP: before 2020CM1 3LS: before 2020CM1 3LT: before 2020CM1 3LW: before 2020CM1 3LY: before 2020CM1 3NA: before 2020CM1 3NB: before 2020CM1 3ND: before 2020CM1 3NF: before 2020CM1 3NH: before 2020CM1 3NJ: before 2020CM1 3NN: before 2020CM1 3NP: before 2020CM1 3NQ: before 2020CM1 3NR: before 2020CM1 3NT: before 2020CM1 3NU: before 2020CM1 3NW: before 2020CM1 3NX: before 2020CM1 3NY: before 2020CM1 3NZ: before 2020CM1 3PA: before 2020CM1 3PB: before 2020CM1 3PD: before 2020CM1 3PE: before 2020CM1 3PF: before 2020CM1 3PH: before 2020CM1 3PJ: before 2020CM1 3PN: before 2020CM1 3PQ: before 2020CM1 3PR: before 2020CM1 3PS: before 2020CM1 3PU: before 2020CM1 3PX: before 2020CM1 3PZ: before 2020CM1 3QD: before 2020CM1 3QE: before 2020CM1 3QF: before 2020CM1 3QG: before 2020CM1 3QH: before 2020CM1 3QJ: before 2020CM1 3QL: before 2020CM1 3QP: before 2020CM1 3QR: before 2020CM1 3QS: before 2020CM1 3QT: before 2020CM1 3QU: before 2020CM1 3QW: before 2020CM1 3QY: before 2020CM1 3QZ: before 2020CM1 3RA: before 2020CM1 3RB: before 2020CM1 3RD: before 2020CM1 3RE: before 2020CM1 3RF: before 2020CM1 3RG: before 2020CM1 3RH: before 2020CM1 3RL: before 2020CM1 3RN: before 2020CM1 3RP: before 2020CM1 3RR: before 2020CM1 3RS: before 2020CM1 3RT: before 2020CM1 3RU: before 2020CM1 3RY: before 2020CM1 3RZ: before 2020CM1 3SA: before 2020CM1 3SB: before 2020CM1 3SD: before 2020CM1 3SE: before 2020CM1 3SF: before 2020CM1 3SG: before 2020CM1 3SH: before 2020CM1 3SJ: before 2020CM1 3SL: before 2020CM1 3SN: before 2020CM1 3SP: before 2020CM1 3SQ: before 2020CM1 3SR: before 2020CM1 3SS: before 2020CM1 3SU: before 2020CM1 3SX: before 2020CM1 3SY: before 2020CM1 3TF: before 2020CM1 3TH: before 2020CM1 3UB: before 2020CM1 3WR: before 2020CM1 3WS: before 2020CM1 3WT: before 2020CM1 3YA: before 2020CM1 3FN: new since 2020 ChelmsfordWrittle Map of every postcode in the CM1 3 sector, by new since 2020 Of the 225 postcodes in the CM1 3 sector that ONS places, 1 are new since 2020 and 224 were in use before 2020. Places named: Chelmsford, Writtle. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A12 ChelmsfordWrittle
  • New since 2020: 1
  • In use before 2020: 224

Of the 225 postcodes in the CM1 3 sector that ONS places, 1 are new since 2020 and 224 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 newest postcode

CM1 3FNFebruary 2023

What do homes sell for in CM1 3?

Homes in CM1 3 sold for a typical £465,000 in the 12 months to August 2026, across 71 sales, up 9.4% on the 12 months before, HM Land Registry's figures show.

£465,000 typical price, the 12 months to August 2026
£425,000 12 months to August 2025
▲ up 9.4% on the 12 months before
  • Detached £590,000 19 sales
  • Semi-detached £475,000 25 sales
  • Terraced £410,000 13 sales
  • Flat or maisonette £203,750 14 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 CM1 3. 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 CM1 3

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.

CM1 3AACM1 3AECM1 3AFCM1 3AGCM1 3ARCM1 3ATCM1 3AXCM1 3BBCM1 3BHCM1 3BJCM1 3BLCM1 3BPCM1 3BSCM1 3BTCM1 3BUCM1 3BWCM1 3BXCM1 3BYCM1 3BZCM1 3DACM1 3DBCM1 3DDCM1 3DECM1 3DFCM1 3DGCM1 3DHCM1 3DJCM1 3DLCM1 3DNCM1 3DPCM1 3DQCM1 3DRCM1 3DSCM1 3DTCM1 3DUCM1 3DXCM1 3DYCM1 3DZCM1 3EACM1 3EBCM1 3EDCM1 3EECM1 3EFCM1 3EGCM1 3EHCM1 3EJCM1 3ELCM1 3ENCM1 3EPCM1 3EQCM1 3ESCM1 3ETCM1 3EUCM1 3EWCM1 3EXCM1 3EYCM1 3EZCM1 3FDCM1 3FECM1 3FFCM1 3FHCM1 3FJCM1 3FLCM1 3FNCM1 3GACM1 3GDCM1 3GFCM1 3GGCM1 3GHCM1 3GJCM1 3GLCM1 3GNCM1 3GPCM1 3GRCM1 3GSCM1 3GUCM1 3GWCM1 3GYCM1 3GZCM1 3HBCM1 3HDCM1 3HECM1 3HFCM1 3HGCM1 3HHCM1 3HJCM1 3HLCM1 3HNCM1 3HPCM1 3HQCM1 3HRCM1 3HSCM1 3HTCM1 3HWCM1 3HYCM1 3HZCM1 3JACM1 3JBCM1 3JDCM1 3JECM1 3JFCM1 3JGCM1 3JHCM1 3JJCM1 3JLCM1 3JNCM1 3JPCM1 3JQCM1 3JRCM1 3JSCM1 3JTCM1 3JUCM1 3JWCM1 3JXCM1 3JYCM1 3JZCM1 3LECM1 3LFCM1 3LGCM1 3LHCM1 3LJCM1 3LLCM1 3LNCM1 3LPCM1 3LQCM1 3LRCM1 3LSCM1 3LTCM1 3LWCM1 3LYCM1 3NACM1 3NBCM1 3NDCM1 3NECM1 3NFCM1 3NGCM1 3NHCM1 3NJCM1 3NLCM1 3NNCM1 3NPCM1 3NQCM1 3NRCM1 3NSCM1 3NTCM1 3NUCM1 3NWCM1 3NXCM1 3NYCM1 3NZCM1 3PACM1 3PBCM1 3PDCM1 3PECM1 3PFCM1 3PHCM1 3PJCM1 3PNCM1 3PQCM1 3PRCM1 3PSCM1 3PUCM1 3PWCM1 3PXCM1 3PZCM1 3QDCM1 3QECM1 3QFCM1 3QGCM1 3QHCM1 3QJCM1 3QLCM1 3QPCM1 3QRCM1 3QSCM1 3QTCM1 3QUCM1 3QWCM1 3QYCM1 3QZCM1 3RACM1 3RBCM1 3RDCM1 3RECM1 3RFCM1 3RGCM1 3RHCM1 3RLCM1 3RNCM1 3RPCM1 3RQCM1 3RRCM1 3RSCM1 3RTCM1 3RUCM1 3RWCM1 3RYCM1 3RZCM1 3SACM1 3SBCM1 3SDCM1 3SECM1 3SFCM1 3SGCM1 3SHCM1 3SJCM1 3SLCM1 3SNCM1 3SPCM1 3SQCM1 3SRCM1 3SSCM1 3STCM1 3SUCM1 3SXCM1 3SYCM1 3TFCM1 3THCM1 3UBCM1 3USCM1 3WQCM1 3WRCM1 3WSCM1 3WTCM1 3YA

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.

Check a postcode

Something wrong on this page? Report an error and we will check it against the source.