CM23 1 postcode sector in the CM23 district

CM23 1 is a sector of the CM23 district: every postcode that starts CM23 1. It has 137 postcodes in use.

Not sure what a sector is? UK postcode format explained.

Every postcode in the CM23 1 sector, by flood risk

Map of every postcode in the CM23 1 sector, by flood risk Of the 137 postcodes in the CM23 1 sector that ONS places, 2 have a home or business at high risk, 9 are at low risk at worst and 126 are not on the Environment Agency's at-risk list. Places named: Stansted Mountfitchet. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A120 CM23 1AA: not on the flood risk listCM23 1AB: not on the flood risk listCM23 1AD: not on the flood risk listCM23 1AE: not on the flood risk listCM23 1AG: not on the flood risk listCM23 1AH: not on the flood risk listCM23 1AJ: not on the flood risk listCM23 1AL: not on the flood risk listCM23 1AN: not on the flood risk listCM23 1AP: not on the flood risk listCM23 1AR: not on the flood risk listCM23 1AS: not on the flood risk listCM23 1AT: not on the flood risk listCM23 1AU: not on the flood risk listCM23 1AW: not on the flood risk listCM23 1AX: not on the flood risk listCM23 1AY: not on the flood risk listCM23 1AZ: not on the flood risk listCM23 1BA: not on the flood risk listCM23 1BB: not on the flood risk listCM23 1BD: not on the flood risk listCM23 1BE: not on the flood risk listCM23 1BJ: not on the flood risk listCM23 1BL: not on the flood risk listCM23 1BN: not on the flood risk listCM23 1BP: not on the flood risk listCM23 1BQ: not on the flood risk listCM23 1BS: not on the flood risk listCM23 1BT: not on the flood risk listCM23 1BW: not on the flood risk listCM23 1BX: not on the flood risk listCM23 1DB: not on the flood risk listCM23 1DD: not on the flood risk listCM23 1DG: not on the flood risk listCM23 1DH: not on the flood risk listCM23 1DL: not on the flood risk listCM23 1DP: not on the flood risk listCM23 1DR: not on the flood risk listCM23 1DS: not on the flood risk listCM23 1DT: not on the flood risk listCM23 1DU: not on the flood risk listCM23 1DZ: not on the flood risk listCM23 1EA: not on the flood risk listCM23 1EF: not on the flood risk listCM23 1EG: not on the flood risk listCM23 1EH: not on the flood risk listCM23 1EL: not on the flood risk listCM23 1EN: not on the flood risk listCM23 1EP: not on the flood risk listCM23 1EQ: not on the flood risk listCM23 1ER: not on the flood risk listCM23 1ES: not on the flood risk listCM23 1ET: not on the flood risk listCM23 1EU: not on the flood risk listCM23 1EX: not on the flood risk listCM23 1EZ: not on the flood risk listCM23 1FA: not on the flood risk listCM23 1FD: not on the flood risk listCM23 1FE: not on the flood risk listCM23 1FF: not on the flood risk listCM23 1FG: not on the flood risk listCM23 1FH: not on the flood risk listCM23 1FJ: not on the flood risk listCM23 1FN: not on the flood risk listCM23 1FP: not on the flood risk listCM23 1FQ: not on the flood risk listCM23 1FR: not on the flood risk listCM23 1FS: not on the flood risk listCM23 1FU: not on the flood risk listCM23 1FW: not on the flood risk listCM23 1FX: not on the flood risk listCM23 1FY: not on the flood risk listCM23 1FZ: not on the flood risk listCM23 1GD: not on the flood risk listCM23 1GE: not on the flood risk listCM23 1GF: not on the flood risk listCM23 1GG: not on the flood risk listCM23 1GJ: not on the flood risk listCM23 1GL: not on the flood risk listCM23 1GN: not on the flood risk listCM23 1GP: not on the flood risk listCM23 1GQ: not on the flood risk listCM23 1GR: not on the flood risk listCM23 1GS: not on the flood risk listCM23 1GU: not on the flood risk listCM23 1GX: not on the flood risk listCM23 1HA: not on the flood risk listCM23 1HB: not on the flood risk listCM23 1HD: not on the flood risk listCM23 1HE: not on the flood risk listCM23 1HG: not on the flood risk listCM23 1HH: not on the flood risk listCM23 1HJ: not on the flood risk listCM23 1HL: not on the flood risk listCM23 1HN: not on the flood risk listCM23 1HP: not on the flood risk listCM23 1HQ: not on the flood risk listCM23 1HR: not on the flood risk listCM23 1HS: not on the flood risk listCM23 1HT: not on the flood risk listCM23 1HU: not on the flood risk listCM23 1HW: not on the flood risk listCM23 1HX: not on the flood risk listCM23 1HY: not on the flood risk listCM23 1HZ: not on the flood risk listCM23 1JA: not on the flood risk listCM23 1JF: not on the flood risk listCM23 1JG: not on the flood risk listCM23 1JJ: not on the flood risk listCM23 1JL: not on the flood risk listCM23 1JR: not on the flood risk listCM23 1JU: not on the flood risk listCM23 1BG: low flood risk at worstCM23 1DA: low flood risk at worstCM23 1DF: low flood risk at worstCM23 1DJ: low flood risk at worstCM23 1DN: low flood risk at worstCM23 1DX: low flood risk at worstCM23 1DY: low flood risk at worstCM23 1JB: low flood risk at worstCM23 1JH: low flood risk at worstCM23 1DE: high flood riskCM23 1DQ: high flood risk Stansted Mountfitchet Map of every postcode in the CM23 1 sector, by flood risk Of the 137 postcodes in the CM23 1 sector that ONS places, 2 have a home or business at high risk, 9 are at low risk at worst and 126 are not on the Environment Agency's at-risk list. Places named: Stort Valley, Bishop's Stortford North. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. Stort ValleyBishop's Stortford North
  • A home or business at high risk: 2
  • At medium risk at worst: 0
  • At low risk at worst: 9
  • At very low risk only: 0
  • Not on the at-risk list: 126

Of the 137 postcodes in the CM23 1 sector that ONS places, 2 have a home or business at high risk, 9 are at low risk at worst and 126 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. 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 1DQ4 at high riskCM23 1DE1 at high risk

What do homes sell for in CM23 1?

Homes in CM23 1 sold for a typical £555,000 in the 12 months to August 2026, across 36 sales, no change on the 12 months before, HM Land Registry's figures show.

£555,000 typical price, the 12 months to August 2026
£555,000 12 months to August 2025
■ no change on the 12 months before
  • Detached £625,000 25 sales
  • Semi-detached £449,000 6 sales
  • Terraced 4 sales, too few to price
  • Flat or maisonette 1 sale, too few to price

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 1. 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 1

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 1AACM23 1ABCM23 1ADCM23 1AECM23 1AGCM23 1AHCM23 1AJCM23 1ALCM23 1ANCM23 1APCM23 1ARCM23 1ASCM23 1ATCM23 1AUCM23 1AWCM23 1AXCM23 1AYCM23 1AZCM23 1BACM23 1BBCM23 1BDCM23 1BECM23 1BGCM23 1BJCM23 1BLCM23 1BNCM23 1BPCM23 1BQCM23 1BSCM23 1BTCM23 1BWCM23 1BXCM23 1BZCM23 1DACM23 1DBCM23 1DDCM23 1DECM23 1DFCM23 1DGCM23 1DHCM23 1DJCM23 1DLCM23 1DNCM23 1DPCM23 1DQCM23 1DRCM23 1DSCM23 1DTCM23 1DUCM23 1DWCM23 1DXCM23 1DYCM23 1DZCM23 1EACM23 1EFCM23 1EGCM23 1EHCM23 1EJCM23 1ELCM23 1ENCM23 1EPCM23 1EQCM23 1ERCM23 1ESCM23 1ETCM23 1EUCM23 1EWCM23 1EXCM23 1EYCM23 1EZCM23 1FACM23 1FBCM23 1FDCM23 1FECM23 1FFCM23 1FGCM23 1FHCM23 1FJCM23 1FLCM23 1FNCM23 1FPCM23 1FQCM23 1FRCM23 1FSCM23 1FTCM23 1FUCM23 1FWCM23 1FXCM23 1FYCM23 1FZCM23 1GACM23 1GBCM23 1GDCM23 1GECM23 1GFCM23 1GGCM23 1GHCM23 1GJCM23 1GLCM23 1GNCM23 1GPCM23 1GQCM23 1GRCM23 1GSCM23 1GTCM23 1GUCM23 1GWCM23 1GXCM23 1GYCM23 1HACM23 1HBCM23 1HDCM23 1HECM23 1HGCM23 1HHCM23 1HJCM23 1HLCM23 1HNCM23 1HPCM23 1HQCM23 1HRCM23 1HSCM23 1HTCM23 1HUCM23 1HWCM23 1HXCM23 1HYCM23 1HZCM23 1JACM23 1JBCM23 1JFCM23 1JGCM23 1JHCM23 1JJCM23 1JLCM23 1JRCM23 1JU

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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