CM21 9 postcode sector in the CM21 district

CM21 9 is a sector of the CM21 district: every postcode that starts CM21 9. It has 175 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 CM21 9 sector, by flood risk

Map of every postcode in the CM21 9 sector, by flood risk Of the 175 postcodes in the CM21 9 sector that ONS places, 9 have a home or business at high risk, 4 are at medium risk at worst, 8 are at low risk at worst and 154 are not on the Environment Agency's at-risk list. 2 postcodes lie beyond the edge and are listed under the map. Places named: Sawbridgeworth. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A1184 CM21 9AA: not on the flood risk listCM21 9AB: not on the flood risk listCM21 9AD: not on the flood risk listCM21 9AE: not on the flood risk listCM21 9AG: not on the flood risk listCM21 9AH: not on the flood risk listCM21 9AJ: not on the flood risk listCM21 9AN: not on the flood risk listCM21 9AQ: not on the flood risk listCM21 9AR: not on the flood risk listCM21 9AT: not on the flood risk listCM21 9AX: not on the flood risk listCM21 9AY: not on the flood risk listCM21 9AZ: not on the flood risk listCM21 9BA: not on the flood risk listCM21 9BB: not on the flood risk listCM21 9BD: not on the flood risk listCM21 9BE: not on the flood risk listCM21 9BG: not on the flood risk listCM21 9BH: not on the flood risk listCM21 9BJ: not on the flood risk listCM21 9BL: not on the flood risk listCM21 9BN: not on the flood risk listCM21 9BS: not on the flood risk listCM21 9BU: not on the flood risk listCM21 9BW: not on the flood risk listCM21 9BX: not on the flood risk listCM21 9BY: not on the flood risk listCM21 9DA: not on the flood risk listCM21 9DB: not on the flood risk listCM21 9DD: not on the flood risk listCM21 9DE: not on the flood risk listCM21 9DF: not on the flood risk listCM21 9DG: not on the flood risk listCM21 9DH: not on the flood risk listCM21 9DL: not on the flood risk listCM21 9DN: not on the flood risk listCM21 9DP: not on the flood risk listCM21 9DQ: not on the flood risk listCM21 9DR: not on the flood risk listCM21 9DS: not on the flood risk listCM21 9DT: not on the flood risk listCM21 9DU: not on the flood risk listCM21 9DY: not on the flood risk listCM21 9EA: not on the flood risk listCM21 9EB: not on the flood risk listCM21 9ED: not on the flood risk listCM21 9EF: not on the flood risk listCM21 9EH: not on the flood risk listCM21 9EJ: not on the flood risk listCM21 9EL: not on the flood risk listCM21 9EN: not on the flood risk listCM21 9EP: not on the flood risk listCM21 9ER: not on the flood risk listCM21 9ES: not on the flood risk listCM21 9EU: not on the flood risk listCM21 9EW: not on the flood risk listCM21 9EX: not on the flood risk listCM21 9EY: not on the flood risk listCM21 9FA: not on the flood risk listCM21 9FB: not on the flood risk listCM21 9FD: not on the flood risk listCM21 9FF: not on the flood risk listCM21 9FG: not on the flood risk listCM21 9FH: not on the flood risk listCM21 9FQ: not on the flood risk listCM21 9FR: not on the flood risk listCM21 9GY: not on the flood risk listCM21 9GZ: not on the flood risk listCM21 9HA: not on the flood risk listCM21 9HB: not on the flood risk listCM21 9HD: not on the flood risk listCM21 9HE: not on the flood risk listCM21 9HG: not on the flood risk listCM21 9HH: not on the flood risk listCM21 9HJ: not on the flood risk listCM21 9HL: not on the flood risk listCM21 9HN: not on the flood risk listCM21 9HP: not on the flood risk listCM21 9HR: not on the flood risk listCM21 9HS: not on the flood risk listCM21 9HT: not on the flood risk listCM21 9HU: not on the flood risk listCM21 9HZ: not on the flood risk listCM21 9JA: not on the flood risk listCM21 9JF: not on the flood risk listCM21 9JG: not on the flood risk listCM21 9JJ: not on the flood risk listCM21 9JL: not on the flood risk listCM21 9JN: not on the flood risk listCM21 9JP: not on the flood risk listCM21 9JR: not on the flood risk listCM21 9JS: not on the flood risk listCM21 9JT: not on the flood risk listCM21 9JZ: not on the flood risk listCM21 9LD: not on the flood risk listCM21 9LE: not on the flood risk listCM21 9LF: not on the flood risk listCM21 9LG: not on the flood risk listCM21 9LH: not on the flood risk listCM21 9LJ: not on the flood risk listCM21 9LL: not on the flood risk listCM21 9LN: not on the flood risk listCM21 9LP: not on the flood risk listCM21 9LQ: not on the flood risk listCM21 9LW: not on the flood risk listCM21 9LZ: not on the flood risk listCM21 9NA: not on the flood risk listCM21 9NB: not on the flood risk listCM21 9ND: not on the flood risk listCM21 9NE: not on the flood risk listCM21 9NF: not on the flood risk listCM21 9NG: not on the flood risk listCM21 9NH: not on the flood risk listCM21 9NJ: not on the flood risk listCM21 9NL: not on the flood risk listCM21 9NN: not on the flood risk listCM21 9NP: not on the flood risk listCM21 9NQ: not on the flood risk listCM21 9NR: not on the flood risk listCM21 9NT: not on the flood risk listCM21 9NU: not on the flood risk listCM21 9NW: not on the flood risk listCM21 9NX: not on the flood risk listCM21 9PN: not on the flood risk listCM21 9PP: not on the flood risk listCM21 9PR: not on the flood risk listCM21 9PS: not on the flood risk listCM21 9PT: not on the flood risk listCM21 9PU: not on the flood risk listCM21 9PW: not on the flood risk listCM21 9PX: not on the flood risk listCM21 9PY: not on the flood risk listCM21 9PZ: not on the flood risk listCM21 9QA: not on the flood risk listCM21 9QD: not on the flood risk listCM21 9QE: not on the flood risk listCM21 9QG: not on the flood risk listCM21 9QH: not on the flood risk listCM21 9QJ: not on the flood risk listCM21 9QL: not on the flood risk listCM21 9QN: not on the flood risk listCM21 9QP: not on the flood risk listCM21 9QU: not on the flood risk listCM21 9QW: not on the flood risk listCM21 9RA: not on the flood risk listCM21 9RB: not on the flood risk listCM21 9RD: not on the flood risk listCM21 9RE: not on the flood risk listCM21 9RF: not on the flood risk listCM21 9TD: not on the flood risk listCM21 9BQ: low flood risk at worstCM21 9ET: low flood risk at worstCM21 9FJ: low flood risk at worstCM21 9FN: low flood risk at worstCM21 9FP: low flood risk at worstCM21 9JE: low flood risk at worstCM21 9PF: low flood risk at worstCM21 9DX: medium flood risk at worstCM21 9NS: medium flood risk at worstCM21 9NY: medium flood risk at worstCM21 9PE: medium flood risk at worstCM21 9BZ: high flood riskCM21 9DJ: high flood riskCM21 9DW: high flood riskCM21 9FE: high flood riskCM21 9JB: high flood riskCM21 9JX: high flood riskCM21 9JY: high flood riskCM21 9LR: high flood riskCM21 9PL: high flood risk Sawbridgeworth Map of every postcode in the CM21 9 sector, by flood risk Of the 175 postcodes in the CM21 9 sector that ONS places, 9 have a home or business at high risk, 4 are at medium risk at worst, 8 are at low risk at worst and 154 are not on the Environment Agency's at-risk list. 2 postcodes lie beyond the edge and are listed under the map. Places named: Sawbridgeworth. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Sawbridgeworth
  • A home or business at high risk: 9
  • At medium risk at worst: 4
  • At low risk at worst: 8
  • At very low risk only: 0
  • Not on the at-risk list: 154

Of the 175 postcodes in the CM21 9 sector that ONS places, 9 have a home or business at high risk, 4 are at medium risk at worst, 8 are at low risk at worst and 154 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.

CM21 9DJ20 at high riskCM21 9PL8 at high riskCM21 9FE7 at high riskCM21 9DW3 at high riskCM21 9JY3 at high riskCM21 9JX2 at high riskCM21 9BZ1 at high riskCM21 9JB1 at high riskCM21 9LR1 at high risk

2 further out, not drawn

These postcodes lie well apart from the rest, so the map is drawn without them to show the rest closer; they are in every count.

CM21 9HXCM21 9HY

What do homes sell for in CM21 9?

Homes in CM21 9 sold for a typical £375,000 in the 12 months to August 2026, across 84 sales, down 2.7% on the 12 months before, HM Land Registry's figures show.

£375,000 typical price, the 12 months to August 2026
£385,500 12 months to August 2025
▼ down 2.7% on the 12 months before
  • Detached £670,000 17 sales
  • Semi-detached £480,000 20 sales
  • Terraced £330,000 21 sales
  • Flat or maisonette £220,000 26 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 CM21 9. 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 CM21 9

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.

CM21 9AACM21 9ABCM21 9ADCM21 9AECM21 9AGCM21 9AHCM21 9AJCM21 9ANCM21 9AQCM21 9ARCM21 9ATCM21 9AXCM21 9AYCM21 9AZCM21 9BACM21 9BBCM21 9BDCM21 9BECM21 9BGCM21 9BHCM21 9BJCM21 9BLCM21 9BNCM21 9BQCM21 9BSCM21 9BUCM21 9BWCM21 9BXCM21 9BYCM21 9BZCM21 9DACM21 9DBCM21 9DDCM21 9DECM21 9DFCM21 9DGCM21 9DHCM21 9DJCM21 9DLCM21 9DNCM21 9DPCM21 9DQCM21 9DRCM21 9DSCM21 9DTCM21 9DUCM21 9DWCM21 9DXCM21 9DYCM21 9EACM21 9EBCM21 9EDCM21 9EFCM21 9EHCM21 9EJCM21 9ELCM21 9ENCM21 9EPCM21 9ERCM21 9ESCM21 9ETCM21 9EUCM21 9EWCM21 9EXCM21 9EYCM21 9FACM21 9FBCM21 9FDCM21 9FECM21 9FFCM21 9FGCM21 9FHCM21 9FJCM21 9FNCM21 9FPCM21 9FQCM21 9FRCM21 9GYCM21 9GZCM21 9HACM21 9HBCM21 9HDCM21 9HECM21 9HGCM21 9HHCM21 9HJCM21 9HLCM21 9HNCM21 9HPCM21 9HRCM21 9HSCM21 9HTCM21 9HUCM21 9HXCM21 9HYCM21 9HZCM21 9JACM21 9JBCM21 9JECM21 9JFCM21 9JGCM21 9JHCM21 9JJCM21 9JLCM21 9JNCM21 9JPCM21 9JRCM21 9JSCM21 9JTCM21 9JXCM21 9JYCM21 9JZCM21 9LDCM21 9LECM21 9LFCM21 9LGCM21 9LHCM21 9LJCM21 9LLCM21 9LNCM21 9LPCM21 9LQCM21 9LRCM21 9LWCM21 9LZCM21 9NACM21 9NBCM21 9NDCM21 9NECM21 9NFCM21 9NGCM21 9NHCM21 9NJCM21 9NLCM21 9NNCM21 9NPCM21 9NQCM21 9NRCM21 9NSCM21 9NTCM21 9NUCM21 9NWCM21 9NXCM21 9NYCM21 9PECM21 9PFCM21 9PLCM21 9PNCM21 9PPCM21 9PRCM21 9PSCM21 9PTCM21 9PUCM21 9PWCM21 9PXCM21 9PYCM21 9PZCM21 9QACM21 9QDCM21 9QECM21 9QGCM21 9QHCM21 9QJCM21 9QLCM21 9QNCM21 9QPCM21 9QUCM21 9QWCM21 9RACM21 9RBCM21 9RDCM21 9RECM21 9RFCM21 9RGCM21 9TD

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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