CM20 3 postcode sector in the CM20 district

CM20 3 is a sector of the CM20 district: every postcode that starts CM20 3. It has 195 postcodes in use, 4 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 CM20 3 sector, by flood risk

Map of every postcode in the CM20 3 sector, by flood risk Of the 195 postcodes in the CM20 3 sector that ONS places, 195 are not on the Environment Agency's at-risk list. Places named: Harlow. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A414A1025 CM20 3AB: not on the flood risk listCM20 3AF: not on the flood risk listCM20 3AG: not on the flood risk listCM20 3AH: not on the flood risk listCM20 3AN: not on the flood risk listCM20 3AP: not on the flood risk listCM20 3AQ: not on the flood risk listCM20 3AS: not on the flood risk listCM20 3AX: not on the flood risk listCM20 3BA: not on the flood risk listCM20 3BB: not on the flood risk listCM20 3BD: not on the flood risk listCM20 3BE: not on the flood risk listCM20 3BG: not on the flood risk listCM20 3BH: not on the flood risk listCM20 3BJ: not on the flood risk listCM20 3BL: not on the flood risk listCM20 3BN: not on the flood risk listCM20 3BQ: not on the flood risk listCM20 3BS: not on the flood risk listCM20 3BW: not on the flood risk listCM20 3BY: not on the flood risk listCM20 3DA: not on the flood risk listCM20 3DB: not on the flood risk listCM20 3DD: not on the flood risk listCM20 3DE: not on the flood risk listCM20 3DF: not on the flood risk listCM20 3DG: not on the flood risk listCM20 3DH: not on the flood risk listCM20 3DJ: not on the flood risk listCM20 3DL: not on the flood risk listCM20 3DN: not on the flood risk listCM20 3DP: not on the flood risk listCM20 3DR: not on the flood risk listCM20 3DT: not on the flood risk listCM20 3DU: not on the flood risk listCM20 3DW: not on the flood risk listCM20 3DY: not on the flood risk listCM20 3DZ: not on the flood risk listCM20 3EA: not on the flood risk listCM20 3EB: not on the flood risk listCM20 3ED: not on the flood risk listCM20 3EE: not on the flood risk listCM20 3EF: not on the flood risk listCM20 3EG: not on the flood risk listCM20 3EH: not on the flood risk listCM20 3EJ: not on the flood risk listCM20 3EL: not on the flood risk listCM20 3EN: not on the flood risk listCM20 3EP: not on the flood risk listCM20 3ER: not on the flood risk listCM20 3ES: not on the flood risk listCM20 3ET: not on the flood risk listCM20 3EU: not on the flood risk listCM20 3EW: not on the flood risk listCM20 3EX: not on the flood risk listCM20 3EY: not on the flood risk listCM20 3EZ: not on the flood risk listCM20 3FA: not on the flood risk listCM20 3FB: not on the flood risk listCM20 3FD: not on the flood risk listCM20 3FF: not on the flood risk listCM20 3GA: not on the flood risk listCM20 3GN: not on the flood risk listCM20 3GQ: not on the flood risk listCM20 3HB: not on the flood risk listCM20 3HD: not on the flood risk listCM20 3HE: not on the flood risk listCM20 3HF: not on the flood risk listCM20 3HG: not on the flood risk listCM20 3HH: not on the flood risk listCM20 3HJ: not on the flood risk listCM20 3HL: not on the flood risk listCM20 3HN: not on the flood risk listCM20 3HP: not on the flood risk listCM20 3HQ: not on the flood risk listCM20 3HR: not on the flood risk listCM20 3HS: not on the flood risk listCM20 3HT: not on the flood risk listCM20 3HU: not on the flood risk listCM20 3HX: not on the flood risk listCM20 3HY: not on the flood risk listCM20 3HZ: not on the flood risk listCM20 3JA: not on the flood risk listCM20 3JB: not on the flood risk listCM20 3JD: not on the flood risk listCM20 3JE: not on the flood risk listCM20 3JF: not on the flood risk listCM20 3JH: not on the flood risk listCM20 3JJ: not on the flood risk listCM20 3JL: not on the flood risk listCM20 3JN: not on the flood risk listCM20 3JP: not on the flood risk listCM20 3JR: not on the flood risk listCM20 3JS: not on the flood risk listCM20 3JT: not on the flood risk listCM20 3JU: not on the flood risk listCM20 3JW: not on the flood risk listCM20 3JX: not on the flood risk listCM20 3JY: not on the flood risk listCM20 3LA: not on the flood risk listCM20 3LB: not on the flood risk listCM20 3LD: not on the flood risk listCM20 3LE: not on the flood risk listCM20 3LG: not on the flood risk listCM20 3LH: not on the flood risk listCM20 3LJ: not on the flood risk listCM20 3LL: not on the flood risk listCM20 3LN: not on the flood risk listCM20 3LP: not on the flood risk listCM20 3LR: not on the flood risk listCM20 3LS: not on the flood risk listCM20 3LT: not on the flood risk listCM20 3LU: not on the flood risk listCM20 3LW: not on the flood risk listCM20 3LX: not on the flood risk listCM20 3LY: not on the flood risk listCM20 3LZ: not on the flood risk listCM20 3NA: not on the flood risk listCM20 3NB: not on the flood risk listCM20 3ND: not on the flood risk listCM20 3NE: not on the flood risk listCM20 3NG: not on the flood risk listCM20 3NH: not on the flood risk listCM20 3NJ: not on the flood risk listCM20 3NL: not on the flood risk listCM20 3NN: not on the flood risk listCM20 3NP: not on the flood risk listCM20 3NR: not on the flood risk listCM20 3NT: not on the flood risk listCM20 3NU: not on the flood risk listCM20 3NW: not on the flood risk listCM20 3NX: not on the flood risk listCM20 3PA: not on the flood risk listCM20 3PB: not on the flood risk listCM20 3PD: not on the flood risk listCM20 3PE: not on the flood risk listCM20 3PF: not on the flood risk listCM20 3PG: not on the flood risk listCM20 3PH: not on the flood risk listCM20 3PJ: not on the flood risk listCM20 3PL: not on the flood risk listCM20 3PN: not on the flood risk listCM20 3PP: not on the flood risk listCM20 3PQ: not on the flood risk listCM20 3PR: not on the flood risk listCM20 3PS: not on the flood risk listCM20 3PT: not on the flood risk listCM20 3PU: not on the flood risk listCM20 3PX: not on the flood risk listCM20 3PY: not on the flood risk listCM20 3QA: not on the flood risk listCM20 3QB: not on the flood risk listCM20 3QD: not on the flood risk listCM20 3QE: not on the flood risk listCM20 3QF: not on the flood risk listCM20 3QG: not on the flood risk listCM20 3QH: not on the flood risk listCM20 3QJ: not on the flood risk listCM20 3QL: not on the flood risk listCM20 3QN: not on the flood risk listCM20 3QP: not on the flood risk listCM20 3QR: not on the flood risk listCM20 3QS: not on the flood risk listCM20 3QT: not on the flood risk listCM20 3QU: not on the flood risk listCM20 3QW: not on the flood risk listCM20 3QX: not on the flood risk listCM20 3QY: not on the flood risk listCM20 3RA: not on the flood risk listCM20 3RB: not on the flood risk listCM20 3RD: not on the flood risk listCM20 3RE: not on the flood risk listCM20 3RF: not on the flood risk listCM20 3RG: not on the flood risk listCM20 3RH: not on the flood risk listCM20 3RL: not on the flood risk listCM20 3RN: not on the flood risk listCM20 3RP: not on the flood risk listCM20 3RQ: not on the flood risk listCM20 3RR: not on the flood risk listCM20 3RS: not on the flood risk listCM20 3RT: not on the flood risk listCM20 3RU: not on the flood risk listCM20 3RW: not on the flood risk listCM20 3RX: not on the flood risk listCM20 3RY: not on the flood risk listCM20 3RZ: not on the flood risk listCM20 3SA: not on the flood risk listCM20 3SD: not on the flood risk listCM20 3SX: not on the flood risk listCM20 3SY: not on the flood risk listCM20 3SZ: not on the flood risk list Harlow Map of every postcode in the CM20 3 sector, by flood risk Of the 195 postcodes in the CM20 3 sector that ONS places, 195 are not on the Environment Agency's at-risk list. Places named: Harlow. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Harlow
  • A home or business at high risk: 0
  • At medium risk at worst: 0
  • At low risk at worst: 0
  • At very low risk only: 0
  • Not on the at-risk list: 195

Of the 195 postcodes in the CM20 3 sector that ONS places, 195 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.

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

What do homes sell for in CM20 3?

Homes in CM20 3 sold for a typical £330,000 in the 12 months to August 2026, across 69 sales, up 4.3% on the 12 months before, HM Land Registry's figures show.

£330,000 typical price, the 12 months to August 2026
£316,250 12 months to August 2025
▲ up 4.3% on the 12 months before
  • Semi-detached £380,000 5 sales
  • Terraced £335,000 55 sales
  • Flat or maisonette £187,500 9 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 CM20 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 CM20 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.

CM20 3ABCM20 3AFCM20 3AGCM20 3AHCM20 3ANCM20 3APCM20 3AQCM20 3ASCM20 3AXCM20 3BACM20 3BBCM20 3BDCM20 3BECM20 3BGCM20 3BHCM20 3BJCM20 3BLCM20 3BNCM20 3BQCM20 3BSCM20 3BWCM20 3BYCM20 3DACM20 3DBCM20 3DDCM20 3DECM20 3DFCM20 3DGCM20 3DHCM20 3DJCM20 3DLCM20 3DNCM20 3DPCM20 3DRCM20 3DTCM20 3DUCM20 3DWCM20 3DYCM20 3DZCM20 3EACM20 3EBCM20 3EDCM20 3EECM20 3EFCM20 3EGCM20 3EHCM20 3EJCM20 3ELCM20 3ENCM20 3EPCM20 3ERCM20 3ESCM20 3ETCM20 3EUCM20 3EWCM20 3EXCM20 3EYCM20 3EZCM20 3FACM20 3FBCM20 3FDCM20 3FFCM20 3FGCM20 3GACM20 3GNCM20 3GQCM20 3HBCM20 3HDCM20 3HECM20 3HFCM20 3HGCM20 3HHCM20 3HJCM20 3HLCM20 3HNCM20 3HPCM20 3HQCM20 3HRCM20 3HSCM20 3HTCM20 3HUCM20 3HXCM20 3HYCM20 3HZCM20 3JACM20 3JBCM20 3JDCM20 3JECM20 3JFCM20 3JHCM20 3JJCM20 3JLCM20 3JNCM20 3JPCM20 3JRCM20 3JSCM20 3JTCM20 3JUCM20 3JWCM20 3JXCM20 3JYCM20 3LACM20 3LBCM20 3LDCM20 3LECM20 3LGCM20 3LHCM20 3LJCM20 3LLCM20 3LNCM20 3LPCM20 3LRCM20 3LSCM20 3LTCM20 3LUCM20 3LWCM20 3LXCM20 3LYCM20 3LZCM20 3NACM20 3NBCM20 3NDCM20 3NECM20 3NGCM20 3NHCM20 3NJCM20 3NLCM20 3NNCM20 3NPCM20 3NRCM20 3NSCM20 3NTCM20 3NUCM20 3NWCM20 3NXCM20 3PACM20 3PBCM20 3PDCM20 3PECM20 3PFCM20 3PGCM20 3PHCM20 3PJCM20 3PLCM20 3PNCM20 3PPCM20 3PQCM20 3PRCM20 3PSCM20 3PTCM20 3PUCM20 3PXCM20 3PYCM20 3QACM20 3QBCM20 3QDCM20 3QECM20 3QFCM20 3QGCM20 3QHCM20 3QJCM20 3QLCM20 3QNCM20 3QPCM20 3QRCM20 3QSCM20 3QTCM20 3QUCM20 3QWCM20 3QXCM20 3QYCM20 3RACM20 3RBCM20 3RDCM20 3RECM20 3RFCM20 3RGCM20 3RHCM20 3RLCM20 3RNCM20 3RPCM20 3RQCM20 3RRCM20 3RSCM20 3RTCM20 3RUCM20 3RWCM20 3RXCM20 3RYCM20 3RZCM20 3SACM20 3SDCM20 3SXCM20 3SYCM20 3SZ

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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