CM23 5 postcode sector in the CM23 district

CM23 5 is a sector of the CM23 district: every postcode that starts CM23 5. It has 203 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 5 sector, by flood risk

Map of every postcode in the CM23 5 sector, by flood risk Of the 203 postcodes in the CM23 5 sector that ONS places, 2 have a home or business at high risk, 1 are at medium risk at worst, 7 are at low risk at worst and 193 are not on the Environment Agency's at-risk list. Places named: Bishop's Stortford All Saints, Bishop's Stortford Parsonage. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A120M11A1250 CM23 5AA: not on the flood risk listCM23 5AB: not on the flood risk listCM23 5AD: not on the flood risk listCM23 5AE: not on the flood risk listCM23 5AF: not on the flood risk listCM23 5AG: not on the flood risk listCM23 5AH: not on the flood risk listCM23 5AJ: not on the flood risk listCM23 5AL: not on the flood risk listCM23 5AQ: not on the flood risk listCM23 5AR: not on the flood risk listCM23 5AT: not on the flood risk listCM23 5BA: not on the flood risk listCM23 5BB: not on the flood risk listCM23 5BD: not on the flood risk listCM23 5BE: not on the flood risk listCM23 5BG: not on the flood risk listCM23 5BH: not on the flood risk listCM23 5BL: not on the flood risk listCM23 5BN: not on the flood risk listCM23 5BP: not on the flood risk listCM23 5BQ: not on the flood risk listCM23 5BS: not on the flood risk listCM23 5BT: not on the flood risk listCM23 5BU: not on the flood risk listCM23 5BX: not on the flood risk listCM23 5BY: not on the flood risk listCM23 5BZ: not on the flood risk listCM23 5DA: not on the flood risk listCM23 5DD: not on the flood risk listCM23 5DE: not on the flood risk listCM23 5DF: not on the flood risk listCM23 5DG: not on the flood risk listCM23 5DH: not on the flood risk listCM23 5DJ: not on the flood risk listCM23 5DL: not on the flood risk listCM23 5DN: not on the flood risk listCM23 5DP: not on the flood risk listCM23 5DQ: not on the flood risk listCM23 5DR: not on the flood risk listCM23 5DS: not on the flood risk listCM23 5DT: not on the flood risk listCM23 5DU: not on the flood risk listCM23 5DW: not on the flood risk listCM23 5DX: not on the flood risk listCM23 5DY: not on the flood risk listCM23 5EA: not on the flood risk listCM23 5EB: not on the flood risk listCM23 5EE: not on the flood risk listCM23 5EF: not on the flood risk listCM23 5EG: not on the flood risk listCM23 5EH: not on the flood risk listCM23 5EJ: not on the flood risk listCM23 5EL: not on the flood risk listCM23 5EN: not on the flood risk listCM23 5EP: not on the flood risk listCM23 5ER: not on the flood risk listCM23 5ES: not on the flood risk listCM23 5ET: not on the flood risk listCM23 5EU: not on the flood risk listCM23 5EX: not on the flood risk listCM23 5EY: not on the flood risk listCM23 5FD: not on the flood risk listCM23 5FE: not on the flood risk listCM23 5FF: not on the flood risk listCM23 5FG: not on the flood risk listCM23 5FH: not on the flood risk listCM23 5FL: not on the flood risk listCM23 5FP: not on the flood risk listCM23 5FQ: not on the flood risk listCM23 5FR: not on the flood risk listCM23 5FS: not on the flood risk listCM23 5FT: not on the flood risk listCM23 5FU: not on the flood risk listCM23 5GB: not on the flood risk listCM23 5GN: not on the flood risk listCM23 5GP: not on the flood risk listCM23 5GW: not on the flood risk listCM23 5GY: not on the flood risk listCM23 5HE: not on the flood risk listCM23 5HF: not on the flood risk listCM23 5HH: not on the flood risk listCM23 5HL: not on the flood risk listCM23 5HN: not on the flood risk listCM23 5HP: not on the flood risk listCM23 5HQ: not on the flood risk listCM23 5HR: not on the flood risk listCM23 5HS: not on the flood risk listCM23 5HT: not on the flood risk listCM23 5HU: not on the flood risk listCM23 5HW: not on the flood risk listCM23 5HX: not on the flood risk listCM23 5HY: not on the flood risk listCM23 5JA: not on the flood risk listCM23 5JB: not on the flood risk listCM23 5JD: not on the flood risk listCM23 5JE: not on the flood risk listCM23 5JF: not on the flood risk listCM23 5JG: not on the flood risk listCM23 5JH: not on the flood risk listCM23 5JJ: not on the flood risk listCM23 5JL: not on the flood risk listCM23 5JN: not on the flood risk listCM23 5JP: not on the flood risk listCM23 5JQ: not on the flood risk listCM23 5JR: not on the flood risk listCM23 5JS: not on the flood risk listCM23 5JT: not on the flood risk listCM23 5JU: not on the flood risk listCM23 5JX: not on the flood risk listCM23 5JY: not on the flood risk listCM23 5JZ: not on the flood risk listCM23 5LA: not on the flood risk listCM23 5LB: not on the flood risk listCM23 5LD: not on the flood risk listCM23 5LE: not on the flood risk listCM23 5LF: not on the flood risk listCM23 5LG: not on the flood risk listCM23 5LH: not on the flood risk listCM23 5LJ: not on the flood risk listCM23 5LL: not on the flood risk listCM23 5LN: not on the flood risk listCM23 5LP: not on the flood risk listCM23 5LQ: not on the flood risk listCM23 5LR: not on the flood risk listCM23 5LS: not on the flood risk listCM23 5LT: not on the flood risk listCM23 5LU: not on the flood risk listCM23 5LW: not on the flood risk listCM23 5LX: not on the flood risk listCM23 5LZ: not on the flood risk listCM23 5NA: not on the flood risk listCM23 5ND: not on the flood risk listCM23 5NF: not on the flood risk listCM23 5NG: not on the flood risk listCM23 5NH: not on the flood risk listCM23 5NJ: not on the flood risk listCM23 5NL: not on the flood risk listCM23 5NN: not on the flood risk listCM23 5NP: not on the flood risk listCM23 5NQ: not on the flood risk listCM23 5NR: not on the flood risk listCM23 5NS: not on the flood risk listCM23 5NT: not on the flood risk listCM23 5NU: not on the flood risk listCM23 5NW: not on the flood risk listCM23 5NX: not on the flood risk listCM23 5PA: not on the flood risk listCM23 5PB: not on the flood risk listCM23 5PD: not on the flood risk listCM23 5PE: not on the flood risk listCM23 5PJ: not on the flood risk listCM23 5PP: not on the flood risk listCM23 5PR: not on the flood risk listCM23 5PS: not on the flood risk listCM23 5PT: not on the flood risk listCM23 5PU: not on the flood risk listCM23 5PW: not on the flood risk listCM23 5PX: not on the flood risk listCM23 5PY: not on the flood risk listCM23 5PZ: not on the flood risk listCM23 5QA: not on the flood risk listCM23 5QB: not on the flood risk listCM23 5QD: not on the flood risk listCM23 5QF: not on the flood risk listCM23 5QG: not on the flood risk listCM23 5QH: not on the flood risk listCM23 5QJ: not on the flood risk listCM23 5QL: not on the flood risk listCM23 5QN: not on the flood risk listCM23 5QP: not on the flood risk listCM23 5QQ: not on the flood risk listCM23 5QR: not on the flood risk listCM23 5QS: not on the flood risk listCM23 5QT: not on the flood risk listCM23 5QU: not on the flood risk listCM23 5QX: not on the flood risk listCM23 5QY: not on the flood risk listCM23 5QZ: not on the flood risk listCM23 5RA: not on the flood risk listCM23 5RB: not on the flood risk listCM23 5RD: not on the flood risk listCM23 5RE: not on the flood risk listCM23 5RG: not on the flood risk listCM23 5RN: not on the flood risk listCM23 5RS: not on the flood risk listCM23 5SB: not on the flood risk listCM23 5SH: not on the flood risk listCM23 5SJ: not on the flood risk listCM23 5SN: not on the flood risk listCM23 5SZ: not on the flood risk listCM23 5TB: not on the flood risk listCM23 5YF: not on the flood risk listCM23 5AN: low flood risk at worstCM23 5AP: low flood risk at worstCM23 5FA: low flood risk at worstCM23 5GZ: low flood risk at worstCM23 5NZ: low flood risk at worstCM23 5PN: low flood risk at worstCM23 5TT: low flood risk at worstCM23 5BJ: medium flood risk at worstCM23 5AS: high flood riskCM23 5AZ: high flood risk Bishop's Stortford All SaintsBishop's Stortford Parsonage Map of every postcode in the CM23 5 sector, by flood risk Of the 203 postcodes in the CM23 5 sector that ONS places, 2 have a home or business at high risk, 1 are at medium risk at worst, 7 are at low risk at worst and 193 are not on the Environment Agency's at-risk list. Places named: Bishop's Stortford All Saints, Bishop's Stortford Parsonage. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A120M11 Bishop's Stortford All SaintsBishop's Stortford Parsonage
  • A home or business at high risk: 2
  • At medium risk at worst: 1
  • At low risk at worst: 7
  • At very low risk only: 0
  • Not on the at-risk list: 193

Of the 203 postcodes in the CM23 5 sector that ONS places, 2 have a home or business at high risk, 1 are at medium risk at worst, 7 are at low risk at worst and 193 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. Names in italics are council wards: we hold no town or village names here.

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 5AZ6 at high riskCM23 5AS1 at high risk

What do homes sell for in CM23 5?

Homes in CM23 5 sold for a typical £450,000 in the 12 months to August 2026, across 91 sales, no change on the 12 months before, HM Land Registry's figures show.

£450,000 typical price, the 12 months to August 2026
£450,000 12 months to August 2025
■ no change on the 12 months before
  • Detached £661,250 20 sales
  • Semi-detached £461,250 34 sales
  • Terraced £405,000 20 sales
  • Flat or maisonette £240,000 17 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 5. 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 5

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 5AACM23 5ABCM23 5ADCM23 5AECM23 5AFCM23 5AGCM23 5AHCM23 5AJCM23 5ALCM23 5ANCM23 5APCM23 5AQCM23 5ARCM23 5ASCM23 5ATCM23 5AZCM23 5BACM23 5BBCM23 5BDCM23 5BECM23 5BGCM23 5BHCM23 5BJCM23 5BLCM23 5BNCM23 5BPCM23 5BQCM23 5BSCM23 5BTCM23 5BUCM23 5BXCM23 5BYCM23 5BZCM23 5DACM23 5DDCM23 5DECM23 5DFCM23 5DGCM23 5DHCM23 5DJCM23 5DLCM23 5DNCM23 5DPCM23 5DQCM23 5DRCM23 5DSCM23 5DTCM23 5DUCM23 5DWCM23 5DXCM23 5DYCM23 5EACM23 5EBCM23 5EECM23 5EFCM23 5EGCM23 5EHCM23 5EJCM23 5ELCM23 5ENCM23 5EPCM23 5ERCM23 5ESCM23 5ETCM23 5EUCM23 5EXCM23 5EYCM23 5FACM23 5FDCM23 5FECM23 5FFCM23 5FGCM23 5FHCM23 5FLCM23 5FPCM23 5FQCM23 5FRCM23 5FSCM23 5FTCM23 5FUCM23 5GBCM23 5GNCM23 5GPCM23 5GWCM23 5GYCM23 5GZCM23 5HECM23 5HFCM23 5HHCM23 5HLCM23 5HNCM23 5HPCM23 5HQCM23 5HRCM23 5HSCM23 5HTCM23 5HUCM23 5HWCM23 5HXCM23 5HYCM23 5JACM23 5JBCM23 5JDCM23 5JECM23 5JFCM23 5JGCM23 5JHCM23 5JJCM23 5JLCM23 5JNCM23 5JPCM23 5JQCM23 5JRCM23 5JSCM23 5JTCM23 5JUCM23 5JXCM23 5JYCM23 5JZCM23 5LACM23 5LBCM23 5LDCM23 5LECM23 5LFCM23 5LGCM23 5LHCM23 5LJCM23 5LLCM23 5LNCM23 5LPCM23 5LQCM23 5LRCM23 5LSCM23 5LTCM23 5LUCM23 5LWCM23 5LXCM23 5LZCM23 5NACM23 5NDCM23 5NFCM23 5NGCM23 5NHCM23 5NJCM23 5NLCM23 5NNCM23 5NPCM23 5NQCM23 5NRCM23 5NSCM23 5NTCM23 5NUCM23 5NWCM23 5NXCM23 5NZCM23 5PACM23 5PBCM23 5PDCM23 5PECM23 5PJCM23 5PNCM23 5PPCM23 5PRCM23 5PSCM23 5PTCM23 5PUCM23 5PWCM23 5PXCM23 5PYCM23 5PZCM23 5QACM23 5QBCM23 5QDCM23 5QFCM23 5QGCM23 5QHCM23 5QJCM23 5QLCM23 5QNCM23 5QPCM23 5QQCM23 5QRCM23 5QSCM23 5QTCM23 5QUCM23 5QXCM23 5QYCM23 5QZCM23 5RACM23 5RBCM23 5RDCM23 5RECM23 5RGCM23 5RNCM23 5RSCM23 5SBCM23 5SHCM23 5SJCM23 5SNCM23 5SZCM23 5TBCM23 5TTCM23 5YF

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.