CM9 4 postcode sector in the CM9 district

CM9 4 is a sector of the CM9 district: every postcode that starts CM9 4. It has 281 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 CM9 4 sector, by flood risk

Map of every postcode in the CM9 4 sector, by flood risk Of the 281 postcodes in the CM9 4 sector that ONS places, 66 have a home or business at high risk, 20 are at medium risk at worst, 26 are at low risk at worst, 35 are at very low risk only and 134 are not on the Environment Agency's at-risk list. 4 groups of postcodes at high or medium risk are outlined: 28 postcodes at high or medium risk; 22 postcodes at high or medium risk; 11 postcodes at high or medium risk; 6 postcodes at high or medium risk. Places named: Maldon. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A414 CM9 4AG: not on the flood risk listCM9 4AH: not on the flood risk listCM9 4AJ: not on the flood risk listCM9 4AL: not on the flood risk listCM9 4AP: not on the flood risk listCM9 4AR: not on the flood risk listCM9 4AS: not on the flood risk listCM9 4AT: not on the flood risk listCM9 4AU: not on the flood risk listCM9 4AW: not on the flood risk listCM9 4AX: not on the flood risk listCM9 4AZ: not on the flood risk listCM9 4BA: not on the flood risk listCM9 4BB: not on the flood risk listCM9 4BD: not on the flood risk listCM9 4BE: not on the flood risk listCM9 4BH: not on the flood risk listCM9 4BJ: not on the flood risk listCM9 4BL: not on the flood risk listCM9 4BN: not on the flood risk listCM9 4BP: not on the flood risk listCM9 4BQ: not on the flood risk listCM9 4BW: not on the flood risk listCM9 4DA: not on the flood risk listCM9 4DE: not on the flood risk listCM9 4DF: not on the flood risk listCM9 4DG: not on the flood risk listCM9 4DH: not on the flood risk listCM9 4DJ: not on the flood risk listCM9 4DN: not on the flood risk listCM9 4DU: not on the flood risk listCM9 4DW: not on the flood risk listCM9 4DX: not on the flood risk listCM9 4DZ: not on the flood risk listCM9 4EA: not on the flood risk listCM9 4EB: not on the flood risk listCM9 4ED: not on the flood risk listCM9 4EE: not on the flood risk listCM9 4EF: not on the flood risk listCM9 4EG: not on the flood risk listCM9 4EH: not on the flood risk listCM9 4EL: not on the flood risk listCM9 4EN: not on the flood risk listCM9 4EP: not on the flood risk listCM9 4ET: not on the flood risk listCM9 4EU: not on the flood risk listCM9 4EX: not on the flood risk listCM9 4EZ: not on the flood risk listCM9 4FA: not on the flood risk listCM9 4FB: not on the flood risk listCM9 4FD: not on the flood risk listCM9 4FE: not on the flood risk listCM9 4FF: not on the flood risk listCM9 4FH: not on the flood risk listCM9 4FN: not on the flood risk listCM9 4FP: not on the flood risk listCM9 4FQ: not on the flood risk listCM9 4FT: not on the flood risk listCM9 4FU: not on the flood risk listCM9 4FW: not on the flood risk listCM9 4FX: not on the flood risk listCM9 4FY: not on the flood risk listCM9 4FZ: not on the flood risk listCM9 4GA: not on the flood risk listCM9 4GF: not on the flood risk listCM9 4GH: not on the flood risk listCM9 4GJ: not on the flood risk listCM9 4GL: not on the flood risk listCM9 4GN: not on the flood risk listCM9 4GP: not on the flood risk listCM9 4GQ: not on the flood risk listCM9 4GS: not on the flood risk listCM9 4GT: not on the flood risk listCM9 4GU: not on the flood risk listCM9 4GW: not on the flood risk listCM9 4GX: not on the flood risk listCM9 4GY: not on the flood risk listCM9 4GZ: not on the flood risk listCM9 4HD: not on the flood risk listCM9 4HE: not on the flood risk listCM9 4HF: not on the flood risk listCM9 4HG: not on the flood risk listCM9 4HJ: not on the flood risk listCM9 4HL: not on the flood risk listCM9 4HN: not on the flood risk listCM9 4HQ: not on the flood risk listCM9 4HS: not on the flood risk listCM9 4HT: not on the flood risk listCM9 4HU: not on the flood risk listCM9 4HW: not on the flood risk listCM9 4HX: not on the flood risk listCM9 4HY: not on the flood risk listCM9 4HZ: not on the flood risk listCM9 4JD: not on the flood risk listCM9 4LG: not on the flood risk listCM9 4PR: not on the flood risk listCM9 4PY: not on the flood risk listCM9 4PZ: not on the flood risk listCM9 4QB: not on the flood risk listCM9 4QD: not on the flood risk listCM9 4QE: not on the flood risk listCM9 4QL: not on the flood risk listCM9 4RE: not on the flood risk listCM9 4RL: not on the flood risk listCM9 4RU: not on the flood risk listCM9 4SH: not on the flood risk listCM9 4SP: not on the flood risk listCM9 4SR: not on the flood risk listCM9 4SU: not on the flood risk listCM9 4SX: not on the flood risk listCM9 4SY: not on the flood risk listCM9 4SZ: not on the flood risk listCM9 4TA: not on the flood risk listCM9 4TH: not on the flood risk listCM9 4TN: not on the flood risk listCM9 4TP: not on the flood risk listCM9 4TS: not on the flood risk listCM9 4TT: not on the flood risk listCM9 4TU: not on the flood risk listCM9 4TW: not on the flood risk listCM9 4TX: not on the flood risk listCM9 4TY: not on the flood risk listCM9 4TZ: not on the flood risk listCM9 4UA: not on the flood risk listCM9 4UB: not on the flood risk listCM9 4UH: not on the flood risk listCM9 4UL: not on the flood risk listCM9 4WF: not on the flood risk listCM9 4YD: not on the flood risk listCM9 4YJ: not on the flood risk listCM9 4YP: not on the flood risk listCM9 4AB: very low flood risk onlyCM9 4AD: very low flood risk onlyCM9 4AN: very low flood risk onlyCM9 4JH: very low flood risk onlyCM9 4LP: very low flood risk onlyCM9 4LZ: very low flood risk onlyCM9 4NR: very low flood risk onlyCM9 4NS: very low flood risk onlyCM9 4NY: very low flood risk onlyCM9 4PD: very low flood risk onlyCM9 4PE: very low flood risk onlyCM9 4PF: very low flood risk onlyCM9 4PH: very low flood risk onlyCM9 4PJ: very low flood risk onlyCM9 4PP: very low flood risk onlyCM9 4PU: very low flood risk onlyCM9 4QA: very low flood risk onlyCM9 4QG: very low flood risk onlyCM9 4QH: very low flood risk onlyCM9 4QN: very low flood risk onlyCM9 4QW: very low flood risk onlyCM9 4QZ: very low flood risk onlyCM9 4TF: very low flood risk onlyCM9 4TJ: very low flood risk onlyCM9 4UD: very low flood risk onlyCM9 4UE: very low flood risk onlyCM9 4UF: very low flood risk onlyCM9 4UJ: very low flood risk onlyCM9 4YA: very low flood risk onlyCM9 4YB: very low flood risk onlyCM9 4YN: very low flood risk onlyCM9 4YR: very low flood risk onlyCM9 4YS: very low flood risk onlyCM9 4YT: very low flood risk onlyCM9 4YW: very low flood risk onlyCM9 4BU: low flood risk at worstCM9 4DT: low flood risk at worstCM9 4DY: low flood risk at worstCM9 4GG: low flood risk at worstCM9 4LS: low flood risk at worstCM9 4ND: low flood risk at worstCM9 4NU: low flood risk at worstCM9 4PW: low flood risk at worstCM9 4PX: low flood risk at worstCM9 4QS: low flood risk at worstCM9 4RB: low flood risk at worstCM9 4RF: low flood risk at worstCM9 4RT: low flood risk at worstCM9 4RW: low flood risk at worstCM9 4RX: low flood risk at worstCM9 4SB: low flood risk at worstCM9 4UG: low flood risk at worstCM9 4UQ: low flood risk at worstCM9 4US: low flood risk at worstCM9 4XL: low flood risk at worstCM9 4YL: low flood risk at worstCM9 4YU: low flood risk at worstCM9 4YX: low flood risk at worstCM9 4YY: low flood risk at worstCM9 4YZ: low flood risk at worstCM9 4DD: medium flood risk at worstCM9 4HH: medium flood risk at worstCM9 4JB: medium flood risk at worstCM9 4LJ: medium flood risk at worstCM9 4LL: medium flood risk at worstCM9 4LQ: medium flood risk at worstCM9 4LT: medium flood risk at worstCM9 4PA: medium flood risk at worstCM9 4PB: medium flood risk at worstCM9 4QF: medium flood risk at worstCM9 4RG: medium flood risk at worstCM9 4RJ: medium flood risk at worstCM9 4RN: medium flood risk at worstCM9 4RQ: medium flood risk at worstCM9 4SN: medium flood risk at worstCM9 4ST: medium flood risk at worstCM9 4UN: medium flood risk at worstCM9 4UR: medium flood risk at worstCM9 4UY: medium flood risk at worstCM9 4XD: medium flood risk at worstCM9 4AA: high flood riskCM9 4BT: high flood riskCM9 4DB: high flood riskCM9 4DR: high flood riskCM9 4EJ: high flood riskCM9 4ER: high flood riskCM9 4GD: high flood riskCM9 4LA: high flood riskCM9 4LB: high flood riskCM9 4LD: high flood riskCM9 4LE: high flood riskCM9 4LF: high flood riskCM9 4LN: high flood riskCM9 4LY: high flood riskCM9 4NA: high flood riskCM9 4NB: high flood riskCM9 4NF: high flood riskCM9 4NG: high flood riskCM9 4NH: high flood riskCM9 4NJ: high flood riskCM9 4NL: high flood riskCM9 4NN: high flood riskCM9 4NP: high flood riskCM9 4NT: high flood riskCM9 4NW: high flood riskCM9 4NX: high flood riskCM9 4PG: high flood riskCM9 4PL: high flood riskCM9 4PN: high flood riskCM9 4PQ: high flood riskCM9 4PS: high flood riskCM9 4PT: high flood riskCM9 4QP: high flood riskCM9 4QR: high flood riskCM9 4QT: high flood riskCM9 4QU: high flood riskCM9 4QX: high flood riskCM9 4QY: high flood riskCM9 4RA: high flood riskCM9 4RD: high flood riskCM9 4RH: high flood riskCM9 4RP: high flood riskCM9 4RR: high flood riskCM9 4RS: high flood riskCM9 4RY: high flood riskCM9 4RZ: high flood riskCM9 4SA: high flood riskCM9 4SD: high flood riskCM9 4SE: high flood riskCM9 4SF: high flood riskCM9 4SG: high flood riskCM9 4SJ: high flood riskCM9 4SL: high flood riskCM9 4SQ: high flood riskCM9 4SS: high flood riskCM9 4SW: high flood riskCM9 4TB: high flood riskCM9 4TD: high flood riskCM9 4TE: high flood riskCM9 4TG: high flood riskCM9 4TL: high flood riskCM9 4UP: high flood riskCM9 4UU: high flood riskCM9 4XB: high flood riskCM9 4XP: high flood risk Maldon 28 postcodes at high or medium risk, outlined: this goes to CM9 4TB, the one with most homes and businesses at high risk28 postcodes at high or medium risk22 postcodes at high or medium risk, outlined: this goes to CM9 4GD, the one with most homes and businesses at high risk22 postcodes at high or medium risk11 postcodes at high or medium risk, outlined: this goes to CM9 4RS, the one with most homes and businesses at high risk11 postcodes at high or medium risk6 postcodes at high or medium risk, outlined: this goes to CM9 4LF, the one with most homes and businesses at high risk6 postcodes at high or medium risk Map of every postcode in the CM9 4 sector, by flood risk Of the 281 postcodes in the CM9 4 sector that ONS places, 66 have a home or business at high risk, 20 are at medium risk at worst, 26 are at low risk at worst, 35 are at very low risk only and 134 are not on the Environment Agency's at-risk list. 4 groups of postcodes at high or medium risk are outlined: 28 postcodes at high or medium risk; 22 postcodes at high or medium risk; 11 postcodes at high or medium risk; 6 postcodes at high or medium risk. Places named: Maldon. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A414 Maldon
  • A home or business at high risk: 66
  • At medium risk at worst: 20
  • At low risk at worst: 26
  • At very low risk only: 35
  • Not on the at-risk list: 134
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 281 postcodes in the CM9 4 sector that ONS places, 66 have a home or business at high risk, 20 are at medium risk at worst, 26 are at low risk at worst, 35 are at very low risk only and 134 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

66 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.

CM9 4RA63 at high riskCM9 4QP43 at high riskCM9 4GD35 at high riskCM9 4TB27 at high riskCM9 4NF24 at high riskCM9 4TG20 at high riskCM9 4NB19 at high riskCM9 4NA19 at high riskCM9 4SQ19 at high riskCM9 4QX18 at high riskCM9 4SW17 at high riskCM9 4NJ16 at high risk

Where the postcodes at high or medium risk lie together

  • 28 postcodes at high or medium risk, outlined on the map. CM9 4TB, is the one with most homes and businesses at high risk.
  • 22 postcodes at high or medium risk, outlined on the map. CM9 4GD, is the one with most homes and businesses at high risk.
  • 11 postcodes at high or medium risk, outlined on the map. CM9 4RS, is the one with most homes and businesses at high risk.
  • 6 postcodes at high or medium risk, outlined on the map. CM9 4LF, is the one with most homes and businesses at high risk.

What do homes sell for in CM9 4?

Homes in CM9 4 sold for a typical £350,000 in the 12 months to August 2026, across 113 sales, down 6.7% on the 12 months before, HM Land Registry's figures show.

£350,000 typical price, the 12 months to August 2026
£375,000 12 months to August 2025
▼ down 6.7% on the 12 months before
  • Detached £463,000 33 sales
  • Semi-detached £350,000 40 sales
  • Terraced £300,000 33 sales
  • Flat or maisonette £190,000 7 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 CM9 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 CM9 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.

CM9 4AACM9 4ABCM9 4ADCM9 4AGCM9 4AHCM9 4AJCM9 4ALCM9 4ANCM9 4APCM9 4ARCM9 4ASCM9 4ATCM9 4AUCM9 4AWCM9 4AXCM9 4AZCM9 4BACM9 4BBCM9 4BDCM9 4BECM9 4BHCM9 4BJCM9 4BLCM9 4BNCM9 4BPCM9 4BQCM9 4BTCM9 4BUCM9 4BWCM9 4DACM9 4DBCM9 4DDCM9 4DECM9 4DFCM9 4DGCM9 4DHCM9 4DJCM9 4DNCM9 4DRCM9 4DTCM9 4DUCM9 4DWCM9 4DXCM9 4DYCM9 4DZCM9 4EACM9 4EBCM9 4EDCM9 4EECM9 4EFCM9 4EGCM9 4EHCM9 4EJCM9 4ELCM9 4ENCM9 4EPCM9 4ERCM9 4ETCM9 4EUCM9 4EXCM9 4EZCM9 4FACM9 4FBCM9 4FDCM9 4FECM9 4FFCM9 4FHCM9 4FNCM9 4FPCM9 4FQCM9 4FTCM9 4FUCM9 4FWCM9 4FXCM9 4FYCM9 4FZCM9 4GACM9 4GDCM9 4GFCM9 4GGCM9 4GHCM9 4GJCM9 4GLCM9 4GNCM9 4GPCM9 4GQCM9 4GRCM9 4GSCM9 4GTCM9 4GUCM9 4GWCM9 4GXCM9 4GYCM9 4GZCM9 4HDCM9 4HECM9 4HFCM9 4HGCM9 4HHCM9 4HJCM9 4HLCM9 4HNCM9 4HQCM9 4HRCM9 4HSCM9 4HTCM9 4HUCM9 4HWCM9 4HXCM9 4HYCM9 4HZCM9 4JBCM9 4JDCM9 4JHCM9 4LACM9 4LBCM9 4LDCM9 4LECM9 4LFCM9 4LGCM9 4LJCM9 4LLCM9 4LNCM9 4LPCM9 4LQCM9 4LSCM9 4LTCM9 4LUCM9 4LYCM9 4LZCM9 4NACM9 4NBCM9 4NDCM9 4NECM9 4NFCM9 4NGCM9 4NHCM9 4NJCM9 4NLCM9 4NNCM9 4NPCM9 4NRCM9 4NSCM9 4NTCM9 4NUCM9 4NWCM9 4NXCM9 4NYCM9 4PACM9 4PBCM9 4PDCM9 4PECM9 4PFCM9 4PGCM9 4PHCM9 4PJCM9 4PLCM9 4PNCM9 4PPCM9 4PQCM9 4PRCM9 4PSCM9 4PTCM9 4PUCM9 4PWCM9 4PXCM9 4PYCM9 4PZCM9 4QACM9 4QBCM9 4QDCM9 4QECM9 4QFCM9 4QGCM9 4QHCM9 4QLCM9 4QNCM9 4QPCM9 4QRCM9 4QSCM9 4QTCM9 4QUCM9 4QWCM9 4QXCM9 4QYCM9 4QZCM9 4RACM9 4RBCM9 4RDCM9 4RECM9 4RFCM9 4RGCM9 4RHCM9 4RJCM9 4RLCM9 4RNCM9 4RPCM9 4RQCM9 4RRCM9 4RSCM9 4RTCM9 4RUCM9 4RWCM9 4RXCM9 4RYCM9 4RZCM9 4SACM9 4SBCM9 4SDCM9 4SECM9 4SFCM9 4SGCM9 4SHCM9 4SJCM9 4SLCM9 4SNCM9 4SPCM9 4SQCM9 4SRCM9 4SSCM9 4STCM9 4SUCM9 4SWCM9 4SXCM9 4SYCM9 4SZCM9 4TACM9 4TBCM9 4TDCM9 4TECM9 4TFCM9 4TGCM9 4THCM9 4TJCM9 4TLCM9 4TNCM9 4TPCM9 4TRCM9 4TSCM9 4TTCM9 4TUCM9 4TWCM9 4TXCM9 4TYCM9 4TZCM9 4UACM9 4UBCM9 4UDCM9 4UECM9 4UFCM9 4UGCM9 4UHCM9 4UJCM9 4ULCM9 4UNCM9 4UPCM9 4UQCM9 4URCM9 4USCM9 4UUCM9 4UYCM9 4WFCM9 4XBCM9 4XDCM9 4XLCM9 4XPCM9 4YACM9 4YBCM9 4YDCM9 4YJCM9 4YLCM9 4YNCM9 4YPCM9 4YRCM9 4YSCM9 4YTCM9 4YUCM9 4YWCM9 4YXCM9 4YYCM9 4YZ

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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