CM23 3 postcode sector in the CM23 district

CM23 3 is a sector of the CM23 district: every postcode that starts CM23 3. It has 265 postcodes in use, 5 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 3 sector, by flood risk

Map of every postcode in the CM23 3 sector, by flood risk Of the 265 postcodes in the CM23 3 sector that ONS places, 25 have a home or business at high risk, 5 are at medium risk at worst, 33 are at low risk at worst and 202 are not on the Environment Agency's at-risk list. 2 groups of postcodes at high or medium risk are outlined: 19 postcodes at high or medium risk; 5 postcodes at high or medium risk. One postcode lies beyond the edge and is listed under the map. Places named: Bishop's Stortford. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A1060 CM23 3AA: not on the flood risk listCM23 3AD: not on the flood risk listCM23 3AJ: not on the flood risk listCM23 3AP: not on the flood risk listCM23 3AW: not on the flood risk listCM23 3BA: not on the flood risk listCM23 3BE: not on the flood risk listCM23 3BN: not on the flood risk listCM23 3BQ: not on the flood risk listCM23 3BS: not on the flood risk listCM23 3DD: not on the flood risk listCM23 3DE: not on the flood risk listCM23 3EB: not on the flood risk listCM23 3EE: not on the flood risk listCM23 3EH: not on the flood risk listCM23 3EJ: not on the flood risk listCM23 3EL: not on the flood risk listCM23 3EN: not on the flood risk listCM23 3EP: not on the flood risk listCM23 3ER: not on the flood risk listCM23 3ES: not on the flood risk listCM23 3ET: not on the flood risk listCM23 3EU: not on the flood risk listCM23 3EX: not on the flood risk listCM23 3EY: not on the flood risk listCM23 3EZ: not on the flood risk listCM23 3FD: not on the flood risk listCM23 3FE: not on the flood risk listCM23 3FL: not on the flood risk listCM23 3FN: not on the flood risk listCM23 3FP: not on the flood risk listCM23 3FQ: not on the flood risk listCM23 3FS: not on the flood risk listCM23 3FU: not on the flood risk listCM23 3FW: not on the flood risk listCM23 3GA: not on the flood risk listCM23 3GB: not on the flood risk listCM23 3GF: not on the flood risk listCM23 3GG: not on the flood risk listCM23 3GH: not on the flood risk listCM23 3GJ: not on the flood risk listCM23 3GL: not on the flood risk listCM23 3GQ: not on the flood risk listCM23 3GR: not on the flood risk listCM23 3GT: not on the flood risk listCM23 3GU: not on the flood risk listCM23 3GW: not on the flood risk listCM23 3GX: not on the flood risk listCM23 3GY: not on the flood risk listCM23 3HA: not on the flood risk listCM23 3HB: not on the flood risk listCM23 3HD: not on the flood risk listCM23 3HE: not on the flood risk listCM23 3HF: not on the flood risk listCM23 3HG: not on the flood risk listCM23 3HJ: not on the flood risk listCM23 3HL: not on the flood risk listCM23 3HN: not on the flood risk listCM23 3HP: not on the flood risk listCM23 3HR: not on the flood risk listCM23 3HS: not on the flood risk listCM23 3HT: not on the flood risk listCM23 3HX: not on the flood risk listCM23 3HZ: not on the flood risk listCM23 3JA: not on the flood risk listCM23 3JD: not on the flood risk listCM23 3JP: not on the flood risk listCM23 3JR: not on the flood risk listCM23 3JS: not on the flood risk listCM23 3JT: not on the flood risk listCM23 3JU: not on the flood risk listCM23 3JW: not on the flood risk listCM23 3JY: not on the flood risk listCM23 3JZ: not on the flood risk listCM23 3LA: not on the flood risk listCM23 3LH: not on the flood risk listCM23 3LN: not on the flood risk listCM23 3LQ: not on the flood risk listCM23 3LR: not on the flood risk listCM23 3LS: not on the flood risk listCM23 3LU: not on the flood risk listCM23 3LY: not on the flood risk listCM23 3LZ: not on the flood risk listCM23 3NB: not on the flood risk listCM23 3ND: not on the flood risk listCM23 3NF: not on the flood risk listCM23 3NG: not on the flood risk listCM23 3NH: not on the flood risk listCM23 3NJ: not on the flood risk listCM23 3NL: not on the flood risk listCM23 3NN: not on the flood risk listCM23 3NP: not on the flood risk listCM23 3NQ: not on the flood risk listCM23 3NR: not on the flood risk listCM23 3NT: not on the flood risk listCM23 3NX: not on the flood risk listCM23 3PA: not on the flood risk listCM23 3PB: not on the flood risk listCM23 3PD: not on the flood risk listCM23 3PE: not on the flood risk listCM23 3PF: not on the flood risk listCM23 3PH: not on the flood risk listCM23 3PJ: not on the flood risk listCM23 3PL: not on the flood risk listCM23 3PN: not on the flood risk listCM23 3PP: not on the flood risk listCM23 3PQ: not on the flood risk listCM23 3PR: not on the flood risk listCM23 3PS: not on the flood risk listCM23 3PT: not on the flood risk listCM23 3PU: not on the flood risk listCM23 3PW: not on the flood risk listCM23 3PX: not on the flood risk listCM23 3PY: not on the flood risk listCM23 3QA: not on the flood risk listCM23 3QB: not on the flood risk listCM23 3QD: not on the flood risk listCM23 3QE: not on the flood risk listCM23 3QF: not on the flood risk listCM23 3QG: not on the flood risk listCM23 3QH: not on the flood risk listCM23 3QJ: not on the flood risk listCM23 3QL: not on the flood risk listCM23 3QN: not on the flood risk listCM23 3QP: not on the flood risk listCM23 3QQ: not on the flood risk listCM23 3QR: not on the flood risk listCM23 3QS: not on the flood risk listCM23 3QT: not on the flood risk listCM23 3QU: not on the flood risk listCM23 3QX: not on the flood risk listCM23 3QY: not on the flood risk listCM23 3QZ: not on the flood risk listCM23 3RA: not on the flood risk listCM23 3RE: not on the flood risk listCM23 3RG: not on the flood risk listCM23 3RH: not on the flood risk listCM23 3RJ: not on the flood risk listCM23 3RL: not on the flood risk listCM23 3RN: not on the flood risk listCM23 3RP: not on the flood risk listCM23 3RQ: not on the flood risk listCM23 3RR: not on the flood risk listCM23 3RS: not on the flood risk listCM23 3RU: not on the flood risk listCM23 3RW: not on the flood risk listCM23 3RX: not on the flood risk listCM23 3SB: not on the flood risk listCM23 3SD: not on the flood risk listCM23 3SE: not on the flood risk listCM23 3SF: not on the flood risk listCM23 3SG: not on the flood risk listCM23 3SH: not on the flood risk listCM23 3SJ: not on the flood risk listCM23 3SL: not on the flood risk listCM23 3SN: not on the flood risk listCM23 3SP: not on the flood risk listCM23 3SQ: not on the flood risk listCM23 3SR: not on the flood risk listCM23 3SS: not on the flood risk listCM23 3ST: not on the flood risk listCM23 3SW: not on the flood risk listCM23 3SX: not on the flood risk listCM23 3SY: not on the flood risk listCM23 3TA: not on the flood risk listCM23 3TB: not on the flood risk listCM23 3TE: not on the flood risk listCM23 3TG: not on the flood risk listCM23 3TJ: not on the flood risk listCM23 3TL: not on the flood risk listCM23 3TN: not on the flood risk listCM23 3TP: not on the flood risk listCM23 3TQ: not on the flood risk listCM23 3TR: not on the flood risk listCM23 3TS: not on the flood risk listCM23 3TT: not on the flood risk listCM23 3TU: not on the flood risk listCM23 3TW: not on the flood risk listCM23 3TX: not on the flood risk listCM23 3TY: not on the flood risk listCM23 3UA: not on the flood risk listCM23 3UB: not on the flood risk listCM23 3UD: not on the flood risk listCM23 3UE: not on the flood risk listCM23 3UJ: not on the flood risk listCM23 3UL: not on the flood risk listCM23 3UP: not on the flood risk listCM23 3UT: not on the flood risk listCM23 3UU: not on the flood risk listCM23 3UZ: not on the flood risk listCM23 3WA: not on the flood risk listCM23 3WB: not on the flood risk listCM23 3WD: not on the flood risk listCM23 3XB: not on the flood risk listCM23 3XH: not on the flood risk listCM23 3YL: not on the flood risk listCM23 3YR: not on the flood risk listCM23 3ZD: not on the flood risk listCM23 3ZF: not on the flood risk listCM23 3ZH: not on the flood risk listCM23 3AG: low flood risk at worstCM23 3AL: low flood risk at worstCM23 3AR: low flood risk at worstCM23 3AT: low flood risk at worstCM23 3AY: low flood risk at worstCM23 3AZ: low flood risk at worstCM23 3BG: low flood risk at worstCM23 3BL: low flood risk at worstCM23 3BP: low flood risk at worstCM23 3BT: low flood risk at worstCM23 3BX: low flood risk at worstCM23 3BY: low flood risk at worstCM23 3EG: low flood risk at worstCM23 3FT: low flood risk at worstCM23 3FX: low flood risk at worstCM23 3GD: low flood risk at worstCM23 3GE: low flood risk at worstCM23 3GN: low flood risk at worstCM23 3HU: low flood risk at worstCM23 3JB: low flood risk at worstCM23 3JL: low flood risk at worstCM23 3LL: low flood risk at worstCM23 3NA: low flood risk at worstCM23 3NE: low flood risk at worstCM23 3NS: low flood risk at worstCM23 3SA: low flood risk at worstCM23 3UH: low flood risk at worstCM23 3US: low flood risk at worstCM23 3YJ: low flood risk at worstCM23 3YN: low flood risk at worstCM23 3YS: low flood risk at worstCM23 3YT: low flood risk at worstCM23 3YW: low flood risk at worstCM23 3AB: medium flood risk at worstCM23 3BJ: medium flood risk at worstCM23 3DA: medium flood risk at worstCM23 3DQ: medium flood risk at worstCM23 3JE: medium flood risk at worstCM23 3AE: high flood riskCM23 3AS: high flood riskCM23 3AX: high flood riskCM23 3BD: high flood riskCM23 3DH: high flood riskCM23 3DP: high flood riskCM23 3DR: high flood riskCM23 3DS: high flood riskCM23 3DT: high flood riskCM23 3DW: high flood riskCM23 3DX: high flood riskCM23 3DY: high flood riskCM23 3FR: high flood riskCM23 3JG: high flood riskCM23 3JH: high flood riskCM23 3JJ: high flood riskCM23 3JN: high flood riskCM23 3JQ: high flood riskCM23 3JX: high flood riskCM23 3LE: high flood riskCM23 3LJ: high flood riskCM23 3RD: high flood riskCM23 3XG: high flood riskCM23 3XQ: high flood riskCM23 3YP: high flood risk Bishop's Stortford 19 postcodes at high or medium risk, outlined: this goes to CM23 3LE, the one with most homes and businesses at high risk19 postcodes at high or medium risk5 postcodes at high or medium risk, outlined: this goes to CM23 3AS, the one with most homes and businesses at high risk5 postcodes at high or medium risk Map of every postcode in the CM23 3 sector, by flood risk Of the 265 postcodes in the CM23 3 sector that ONS places, 25 have a home or business at high risk, 5 are at medium risk at worst, 33 are at low risk at worst and 202 are not on the Environment Agency's at-risk list. 2 groups of postcodes at high or medium risk are outlined: 19 postcodes at high or medium risk; 5 postcodes at high or medium risk. One postcode lies beyond the edge and is listed under the map. Places named: Bishop's Stortford. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. Bishop's Stortford
  • A home or business at high risk: 25
  • At medium risk at worst: 5
  • At low risk at worst: 33
  • At very low risk only: 0
  • Not on the at-risk list: 202
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 265 postcodes in the CM23 3 sector that ONS places, 25 have a home or business at high risk, 5 are at medium risk at worst, 33 are at low risk at worst and 202 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. A dashed outline shows where 5 or more lie within 150 metres of each other. It is not a boundary, and 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

25 postcodes here have a home or business at high risk. These are the 12 with the most homes and businesses at that risk.

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

CM23 3AS30 at high riskCM23 3LE21 at high riskCM23 3DH8 at high riskCM23 3DR6 at high riskCM23 3JH6 at high riskCM23 3JJ6 at high riskCM23 3FR4 at high riskCM23 3JG4 at high riskCM23 3DX4 at high riskCM23 3DY3 at high riskCM23 3BD3 at high riskCM23 3DW3 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.

CM23 3DZ

Where the postcodes at high or medium risk lie together

  • 19 postcodes at high or medium risk, outlined on the map. CM23 3LE, is the one with most homes and businesses at high risk.
  • 5 postcodes at high or medium risk, outlined on the map. CM23 3AS, is the one with most homes and businesses at high risk.

What do homes sell for in CM23 3?

Homes in CM23 3 sold for a typical £352,500 in the 12 months to August 2026, across 116 sales, down 1% on the 12 months before, HM Land Registry's figures show.

£352,500 typical price, the 12 months to August 2026
£356,000 12 months to August 2025
▼ down 1% on the 12 months before
  • Detached £505,000 5 sales
  • Semi-detached £435,000 41 sales
  • Terraced £355,000 25 sales
  • Flat or maisonette £260,000 45 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 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 CM23 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.

CM23 3AACM23 3ABCM23 3ADCM23 3AECM23 3AGCM23 3AJCM23 3ALCM23 3APCM23 3ARCM23 3ASCM23 3ATCM23 3AWCM23 3AXCM23 3AYCM23 3AZCM23 3BACM23 3BDCM23 3BECM23 3BGCM23 3BJCM23 3BLCM23 3BNCM23 3BPCM23 3BQCM23 3BSCM23 3BTCM23 3BXCM23 3BYCM23 3DACM23 3DDCM23 3DECM23 3DHCM23 3DPCM23 3DQCM23 3DRCM23 3DSCM23 3DTCM23 3DWCM23 3DXCM23 3DYCM23 3DZCM23 3EBCM23 3EECM23 3EGCM23 3EHCM23 3EJCM23 3ELCM23 3ENCM23 3EPCM23 3ERCM23 3ESCM23 3ETCM23 3EUCM23 3EXCM23 3EYCM23 3EZCM23 3FDCM23 3FECM23 3FLCM23 3FNCM23 3FPCM23 3FQCM23 3FRCM23 3FSCM23 3FTCM23 3FUCM23 3FWCM23 3FXCM23 3GACM23 3GBCM23 3GDCM23 3GECM23 3GFCM23 3GGCM23 3GHCM23 3GJCM23 3GLCM23 3GNCM23 3GPCM23 3GQCM23 3GRCM23 3GTCM23 3GUCM23 3GWCM23 3GXCM23 3GYCM23 3HACM23 3HBCM23 3HDCM23 3HECM23 3HFCM23 3HGCM23 3HJCM23 3HLCM23 3HNCM23 3HPCM23 3HRCM23 3HSCM23 3HTCM23 3HUCM23 3HXCM23 3HZCM23 3JACM23 3JBCM23 3JDCM23 3JECM23 3JGCM23 3JHCM23 3JJCM23 3JLCM23 3JNCM23 3JPCM23 3JQCM23 3JRCM23 3JSCM23 3JTCM23 3JUCM23 3JWCM23 3JXCM23 3JYCM23 3JZCM23 3LACM23 3LECM23 3LHCM23 3LJCM23 3LLCM23 3LNCM23 3LQCM23 3LRCM23 3LSCM23 3LUCM23 3LYCM23 3LZCM23 3NACM23 3NBCM23 3NDCM23 3NECM23 3NFCM23 3NGCM23 3NHCM23 3NJCM23 3NLCM23 3NNCM23 3NPCM23 3NQCM23 3NRCM23 3NSCM23 3NTCM23 3NXCM23 3PACM23 3PBCM23 3PDCM23 3PECM23 3PFCM23 3PHCM23 3PJCM23 3PLCM23 3PNCM23 3PPCM23 3PQCM23 3PRCM23 3PSCM23 3PTCM23 3PUCM23 3PWCM23 3PXCM23 3PYCM23 3QACM23 3QBCM23 3QDCM23 3QECM23 3QFCM23 3QGCM23 3QHCM23 3QJCM23 3QLCM23 3QNCM23 3QPCM23 3QQCM23 3QRCM23 3QSCM23 3QTCM23 3QUCM23 3QXCM23 3QYCM23 3QZCM23 3RACM23 3RDCM23 3RECM23 3RGCM23 3RHCM23 3RJCM23 3RLCM23 3RNCM23 3RPCM23 3RQCM23 3RRCM23 3RSCM23 3RUCM23 3RWCM23 3RXCM23 3SACM23 3SBCM23 3SDCM23 3SECM23 3SFCM23 3SGCM23 3SHCM23 3SJCM23 3SLCM23 3SNCM23 3SPCM23 3SQCM23 3SRCM23 3SSCM23 3STCM23 3SWCM23 3SXCM23 3SYCM23 3TACM23 3TBCM23 3TECM23 3TGCM23 3TJCM23 3TLCM23 3TNCM23 3TPCM23 3TQCM23 3TRCM23 3TSCM23 3TTCM23 3TUCM23 3TWCM23 3TXCM23 3TYCM23 3UACM23 3UBCM23 3UDCM23 3UECM23 3UHCM23 3UJCM23 3ULCM23 3UPCM23 3USCM23 3UTCM23 3UUCM23 3UZCM23 3WACM23 3WBCM23 3WDCM23 3XBCM23 3XGCM23 3XHCM23 3XQCM23 3YJCM23 3YLCM23 3YNCM23 3YPCM23 3YRCM23 3YSCM23 3YTCM23 3YWCM23 3ZDCM23 3ZFCM23 3ZH

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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