CM23 4 postcode sector in the CM23 district

CM23 4 is a sector of the CM23 district: every postcode that starts CM23 4. It has 231 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 CM23 4 sector, by flood risk

Map of every postcode in the CM23 4 sector, by flood risk Of the 231 postcodes in the CM23 4 sector that ONS places, 1 have a home or business at high risk, 1 are at medium risk at worst, 2 are at low risk at worst and 227 are not on the Environment Agency's at-risk list. Places named: Bishop's Stortford. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A1184A1060 CM23 4AA: not on the flood risk listCM23 4AB: not on the flood risk listCM23 4AD: not on the flood risk listCM23 4AE: not on the flood risk listCM23 4AG: not on the flood risk listCM23 4AJ: not on the flood risk listCM23 4AL: not on the flood risk listCM23 4AN: not on the flood risk listCM23 4AP: not on the flood risk listCM23 4AR: not on the flood risk listCM23 4AS: not on the flood risk listCM23 4AT: not on the flood risk listCM23 4AW: not on the flood risk listCM23 4AZ: not on the flood risk listCM23 4BB: not on the flood risk listCM23 4BD: not on the flood risk listCM23 4BE: not on the flood risk listCM23 4BG: not on the flood risk listCM23 4BH: not on the flood risk listCM23 4BJ: not on the flood risk listCM23 4BL: not on the flood risk listCM23 4BN: not on the flood risk listCM23 4BP: not on the flood risk listCM23 4BQ: not on the flood risk listCM23 4BS: not on the flood risk listCM23 4BT: not on the flood risk listCM23 4BU: not on the flood risk listCM23 4BW: not on the flood risk listCM23 4BX: not on the flood risk listCM23 4BY: not on the flood risk listCM23 4BZ: not on the flood risk listCM23 4DA: not on the flood risk listCM23 4DB: not on the flood risk listCM23 4DD: not on the flood risk listCM23 4DE: not on the flood risk listCM23 4DF: not on the flood risk listCM23 4DG: not on the flood risk listCM23 4DH: not on the flood risk listCM23 4DJ: not on the flood risk listCM23 4DL: not on the flood risk listCM23 4DN: not on the flood risk listCM23 4DP: not on the flood risk listCM23 4DQ: not on the flood risk listCM23 4DR: not on the flood risk listCM23 4DS: not on the flood risk listCM23 4DT: not on the flood risk listCM23 4DU: not on the flood risk listCM23 4DW: not on the flood risk listCM23 4DX: not on the flood risk listCM23 4DY: not on the flood risk listCM23 4EA: not on the flood risk listCM23 4EB: not on the flood risk listCM23 4ED: not on the flood risk listCM23 4EE: not on the flood risk listCM23 4EF: not on the flood risk listCM23 4EG: not on the flood risk listCM23 4EH: not on the flood risk listCM23 4EJ: not on the flood risk listCM23 4EL: not on the flood risk listCM23 4EN: not on the flood risk listCM23 4EP: not on the flood risk listCM23 4EQ: not on the flood risk listCM23 4ER: not on the flood risk listCM23 4ES: not on the flood risk listCM23 4ET: not on the flood risk listCM23 4EU: not on the flood risk listCM23 4EW: not on the flood risk listCM23 4EX: not on the flood risk listCM23 4EY: not on the flood risk listCM23 4EZ: not on the flood risk listCM23 4FE: not on the flood risk listCM23 4FF: not on the flood risk listCM23 4FG: not on the flood risk listCM23 4FH: not on the flood risk listCM23 4FJ: not on the flood risk listCM23 4FL: not on the flood risk listCM23 4FN: not on the flood risk listCM23 4FP: not on the flood risk listCM23 4FQ: not on the flood risk listCM23 4FR: not on the flood risk listCM23 4FS: not on the flood risk listCM23 4FT: not on the flood risk listCM23 4FW: not on the flood risk listCM23 4FX: not on the flood risk listCM23 4FY: not on the flood risk listCM23 4FZ: not on the flood risk listCM23 4GA: not on the flood risk listCM23 4GB: not on the flood risk listCM23 4GD: not on the flood risk listCM23 4GF: not on the flood risk listCM23 4GG: not on the flood risk listCM23 4GH: not on the flood risk listCM23 4GJ: not on the flood risk listCM23 4GL: not on the flood risk listCM23 4GP: not on the flood risk listCM23 4GR: not on the flood risk listCM23 4GS: not on the flood risk listCM23 4GU: not on the flood risk listCM23 4GZ: not on the flood risk listCM23 4HB: not on the flood risk listCM23 4HD: not on the flood risk listCM23 4HE: not on the flood risk listCM23 4HF: not on the flood risk listCM23 4HG: not on the flood risk listCM23 4HH: not on the flood risk listCM23 4HJ: not on the flood risk listCM23 4HL: not on the flood risk listCM23 4HN: not on the flood risk listCM23 4HP: not on the flood risk listCM23 4HQ: not on the flood risk listCM23 4HR: not on the flood risk listCM23 4HS: not on the flood risk listCM23 4HT: not on the flood risk listCM23 4HU: not on the flood risk listCM23 4HW: not on the flood risk listCM23 4HX: not on the flood risk listCM23 4HY: not on the flood risk listCM23 4JB: not on the flood risk listCM23 4JD: not on the flood risk listCM23 4JE: not on the flood risk listCM23 4JF: not on the flood risk listCM23 4JG: not on the flood risk listCM23 4JH: not on the flood risk listCM23 4JJ: not on the flood risk listCM23 4JL: not on the flood risk listCM23 4JN: not on the flood risk listCM23 4JP: not on the flood risk listCM23 4JQ: not on the flood risk listCM23 4JR: not on the flood risk listCM23 4JS: not on the flood risk listCM23 4JT: not on the flood risk listCM23 4JU: not on the flood risk listCM23 4JW: not on the flood risk listCM23 4JX: not on the flood risk listCM23 4JY: not on the flood risk listCM23 4JZ: not on the flood risk listCM23 4LE: not on the flood risk listCM23 4LF: not on the flood risk listCM23 4LH: not on the flood risk listCM23 4LL: not on the flood risk listCM23 4LN: not on the flood risk listCM23 4LT: not on the flood risk listCM23 4LU: not on the flood risk listCM23 4LY: not on the flood risk listCM23 4LZ: not on the flood risk listCM23 4NB: not on the flood risk listCM23 4NE: not on the flood risk listCM23 4NG: not on the flood risk listCM23 4NX: not on the flood risk listCM23 4NZ: not on the flood risk listCM23 4PA: not on the flood risk listCM23 4PB: not on the flood risk listCM23 4PD: not on the flood risk listCM23 4PE: not on the flood risk listCM23 4PF: not on the flood risk listCM23 4PG: not on the flood risk listCM23 4PH: not on the flood risk listCM23 4PJ: not on the flood risk listCM23 4PL: not on the flood risk listCM23 4PP: not on the flood risk listCM23 4PQ: not on the flood risk listCM23 4PR: not on the flood risk listCM23 4PT: not on the flood risk listCM23 4PU: not on the flood risk listCM23 4PW: not on the flood risk listCM23 4PX: not on the flood risk listCM23 4PY: not on the flood risk listCM23 4PZ: not on the flood risk listCM23 4QA: not on the flood risk listCM23 4QE: not on the flood risk listCM23 4QF: not on the flood risk listCM23 4QG: not on the flood risk listCM23 4QN: not on the flood risk listCM23 4QQ: not on the flood risk listCM23 4QS: not on the flood risk listCM23 4QT: not on the flood risk listCM23 4QZ: not on the flood risk listCM23 4RB: not on the flood risk listCM23 4RE: not on the flood risk listCM23 4RF: not on the flood risk listCM23 4RG: not on the flood risk listCM23 4RH: not on the flood risk listCM23 4RJ: not on the flood risk listCM23 4RL: not on the flood risk listCM23 4RN: not on the flood risk listCM23 4RP: not on the flood risk listCM23 4RQ: not on the flood risk listCM23 4RR: not on the flood risk listCM23 4RS: not on the flood risk listCM23 4RT: not on the flood risk listCM23 4RU: not on the flood risk listCM23 4RW: not on the flood risk listCM23 4RX: not on the flood risk listCM23 4RY: not on the flood risk listCM23 4SA: not on the flood risk listCM23 4SB: not on the flood risk listCM23 4SD: not on the flood risk listCM23 4SE: not on the flood risk listCM23 4SF: not on the flood risk listCM23 4SG: not on the flood risk listCM23 4SH: not on the flood risk listCM23 4SL: not on the flood risk listCM23 4SN: not on the flood risk listCM23 4SP: not on the flood risk listCM23 4ST: not on the flood risk listCM23 4SU: not on the flood risk listCM23 4SW: not on the flood risk listCM23 4SX: not on the flood risk listCM23 4SY: not on the flood risk listCM23 4SZ: not on the flood risk listCM23 4TA: not on the flood risk listCM23 4TB: not on the flood risk listCM23 4TD: not on the flood risk listCM23 4TE: not on the flood risk listCM23 4TF: not on the flood risk listCM23 4TG: not on the flood risk listCM23 4TH: not on the flood risk listCM23 4TJ: not on the flood risk listCM23 4TL: not on the flood risk listCM23 4TN: not on the flood risk listCM23 4TP: not on the flood risk listCM23 4TQ: not on the flood risk listCM23 4TR: not on the flood risk listCM23 4AU: low flood risk at worstCM23 4AX: low flood risk at worstCM23 4BA: medium flood risk at worstCM23 4AY: high flood risk Bishop's Stortford Map of every postcode in the CM23 4 sector, by flood risk Of the 231 postcodes in the CM23 4 sector that ONS places, 1 have a home or business at high risk, 1 are at medium risk at worst, 2 are at low risk at worst and 227 are not on the Environment Agency's at-risk list. Places named: Bishop's Stortford. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A1250 Bishop's Stortford
  • A home or business at high risk: 1
  • At medium risk at worst: 1
  • At low risk at worst: 2
  • At very low risk only: 0
  • Not on the at-risk list: 227

Of the 231 postcodes in the CM23 4 sector that ONS places, 1 have a home or business at high risk, 1 are at medium risk at worst, 2 are at low risk at worst and 227 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

The postcodes at high risk

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

CM23 4AY1 at high risk

What do homes sell for in CM23 4?

Homes in CM23 4 sold for a typical £469,000 in the 12 months to August 2026, across 148 sales, down 4.3% on the 12 months before, HM Land Registry's figures show.

£469,000 typical price, the 12 months to August 2026
£489,998 12 months to August 2025
▼ down 4.3% on the 12 months before
  • Detached £612,000 65 sales
  • Semi-detached £435,000 31 sales
  • Terraced £350,000 47 sales
  • Flat or maisonette £250,000 5 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 CM23 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 CM23 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.

CM23 4AACM23 4ABCM23 4ADCM23 4AECM23 4AGCM23 4AJCM23 4ALCM23 4ANCM23 4APCM23 4ARCM23 4ASCM23 4ATCM23 4AUCM23 4AWCM23 4AXCM23 4AYCM23 4AZCM23 4BACM23 4BBCM23 4BDCM23 4BECM23 4BGCM23 4BHCM23 4BJCM23 4BLCM23 4BNCM23 4BPCM23 4BQCM23 4BSCM23 4BTCM23 4BUCM23 4BWCM23 4BXCM23 4BYCM23 4BZCM23 4DACM23 4DBCM23 4DDCM23 4DECM23 4DFCM23 4DGCM23 4DHCM23 4DJCM23 4DLCM23 4DNCM23 4DPCM23 4DQCM23 4DRCM23 4DSCM23 4DTCM23 4DUCM23 4DWCM23 4DXCM23 4DYCM23 4EACM23 4EBCM23 4EDCM23 4EECM23 4EFCM23 4EGCM23 4EHCM23 4EJCM23 4ELCM23 4ENCM23 4EPCM23 4EQCM23 4ERCM23 4ESCM23 4ETCM23 4EUCM23 4EWCM23 4EXCM23 4EYCM23 4EZCM23 4FECM23 4FFCM23 4FGCM23 4FHCM23 4FJCM23 4FLCM23 4FNCM23 4FPCM23 4FQCM23 4FRCM23 4FSCM23 4FTCM23 4FWCM23 4FXCM23 4FYCM23 4FZCM23 4GACM23 4GBCM23 4GDCM23 4GFCM23 4GGCM23 4GHCM23 4GJCM23 4GLCM23 4GPCM23 4GRCM23 4GSCM23 4GUCM23 4GZCM23 4HBCM23 4HDCM23 4HECM23 4HFCM23 4HGCM23 4HHCM23 4HJCM23 4HLCM23 4HNCM23 4HPCM23 4HQCM23 4HRCM23 4HSCM23 4HTCM23 4HUCM23 4HWCM23 4HXCM23 4HYCM23 4JBCM23 4JDCM23 4JECM23 4JFCM23 4JGCM23 4JHCM23 4JJCM23 4JLCM23 4JNCM23 4JPCM23 4JQCM23 4JRCM23 4JSCM23 4JTCM23 4JUCM23 4JWCM23 4JXCM23 4JYCM23 4JZCM23 4LECM23 4LFCM23 4LHCM23 4LLCM23 4LNCM23 4LTCM23 4LUCM23 4LYCM23 4LZCM23 4NBCM23 4NECM23 4NGCM23 4NXCM23 4NZCM23 4PACM23 4PBCM23 4PDCM23 4PECM23 4PFCM23 4PGCM23 4PHCM23 4PJCM23 4PLCM23 4PPCM23 4PQCM23 4PRCM23 4PTCM23 4PUCM23 4PWCM23 4PXCM23 4PYCM23 4PZCM23 4QACM23 4QECM23 4QFCM23 4QGCM23 4QNCM23 4QQCM23 4QSCM23 4QTCM23 4QUCM23 4QWCM23 4QZCM23 4RBCM23 4RECM23 4RFCM23 4RGCM23 4RHCM23 4RJCM23 4RLCM23 4RNCM23 4RPCM23 4RQCM23 4RRCM23 4RSCM23 4RTCM23 4RUCM23 4RWCM23 4RXCM23 4RYCM23 4RZCM23 4SACM23 4SBCM23 4SDCM23 4SECM23 4SFCM23 4SGCM23 4SHCM23 4SLCM23 4SNCM23 4SPCM23 4STCM23 4SUCM23 4SWCM23 4SXCM23 4SYCM23 4SZCM23 4TACM23 4TBCM23 4TDCM23 4TECM23 4TFCM23 4TGCM23 4THCM23 4TJCM23 4TLCM23 4TNCM23 4TPCM23 4TQCM23 4TRCM23 4WP

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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