CM3 3 postcode sector in the CM3 district

CM3 3 is a sector of the CM3 district: every postcode that starts CM3 3. It has 207 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 CM3 3 sector, by flood risk

Map of every postcode in the CM3 3 sector, by flood risk Of the 207 postcodes in the CM3 3 sector that ONS places, 7 have a home or business at high risk, 2 are at medium risk at worst, 1 are at low risk at worst and 197 are not on the Environment Agency's at-risk list. Places named: Broomfield, Boreham. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A131A138A1016 CM3 3AA: not on the flood risk listCM3 3AB: not on the flood risk listCM3 3AD: not on the flood risk listCM3 3AE: not on the flood risk listCM3 3AG: not on the flood risk listCM3 3AH: not on the flood risk listCM3 3AJ: not on the flood risk listCM3 3AL: not on the flood risk listCM3 3AN: not on the flood risk listCM3 3AR: not on the flood risk listCM3 3AS: not on the flood risk listCM3 3AW: not on the flood risk listCM3 3AX: not on the flood risk listCM3 3AZ: not on the flood risk listCM3 3BA: not on the flood risk listCM3 3BB: not on the flood risk listCM3 3BD: not on the flood risk listCM3 3BE: not on the flood risk listCM3 3BG: not on the flood risk listCM3 3BH: not on the flood risk listCM3 3BN: not on the flood risk listCM3 3BP: not on the flood risk listCM3 3BQ: not on the flood risk listCM3 3BS: not on the flood risk listCM3 3BT: not on the flood risk listCM3 3BU: not on the flood risk listCM3 3BW: not on the flood risk listCM3 3BX: not on the flood risk listCM3 3BZ: not on the flood risk listCM3 3DA: not on the flood risk listCM3 3DB: not on the flood risk listCM3 3DD: not on the flood risk listCM3 3DE: not on the flood risk listCM3 3DG: not on the flood risk listCM3 3DH: not on the flood risk listCM3 3DJ: not on the flood risk listCM3 3DL: not on the flood risk listCM3 3DQ: not on the flood risk listCM3 3DR: not on the flood risk listCM3 3DS: not on the flood risk listCM3 3DT: not on the flood risk listCM3 3DU: not on the flood risk listCM3 3DX: not on the flood risk listCM3 3DY: not on the flood risk listCM3 3DZ: not on the flood risk listCM3 3EA: not on the flood risk listCM3 3EB: not on the flood risk listCM3 3ED: not on the flood risk listCM3 3EE: not on the flood risk listCM3 3EF: not on the flood risk listCM3 3EG: not on the flood risk listCM3 3EH: not on the flood risk listCM3 3EJ: not on the flood risk listCM3 3EN: not on the flood risk listCM3 3EP: not on the flood risk listCM3 3EQ: not on the flood risk listCM3 3ER: not on the flood risk listCM3 3EX: not on the flood risk listCM3 3EY: not on the flood risk listCM3 3EZ: not on the flood risk listCM3 3FA: not on the flood risk listCM3 3FB: not on the flood risk listCM3 3FE: not on the flood risk listCM3 3FG: not on the flood risk listCM3 3FH: not on the flood risk listCM3 3FL: not on the flood risk listCM3 3FN: not on the flood risk listCM3 3FP: not on the flood risk listCM3 3FQ: not on the flood risk listCM3 3FR: not on the flood risk listCM3 3FS: not on the flood risk listCM3 3FT: not on the flood risk listCM3 3FU: not on the flood risk listCM3 3FW: not on the flood risk listCM3 3FX: not on the flood risk listCM3 3FZ: not on the flood risk listCM3 3GA: not on the flood risk listCM3 3GD: not on the flood risk listCM3 3GE: not on the flood risk listCM3 3GF: not on the flood risk listCM3 3GG: not on the flood risk listCM3 3GH: not on the flood risk listCM3 3GJ: not on the flood risk listCM3 3GN: not on the flood risk listCM3 3GP: not on the flood risk listCM3 3GQ: not on the flood risk listCM3 3GR: not on the flood risk listCM3 3GS: not on the flood risk listCM3 3GW: not on the flood risk listCM3 3GX: not on the flood risk listCM3 3GY: not on the flood risk listCM3 3GZ: not on the flood risk listCM3 3HA: not on the flood risk listCM3 3HB: not on the flood risk listCM3 3HD: not on the flood risk listCM3 3HG: not on the flood risk listCM3 3HH: not on the flood risk listCM3 3HJ: not on the flood risk listCM3 3HN: not on the flood risk listCM3 3HQ: not on the flood risk listCM3 3HR: not on the flood risk listCM3 3HS: not on the flood risk listCM3 3HU: not on the flood risk listCM3 3HW: not on the flood risk listCM3 3HY: not on the flood risk listCM3 3HZ: not on the flood risk listCM3 3JA: not on the flood risk listCM3 3JB: not on the flood risk listCM3 3JD: not on the flood risk listCM3 3JF: not on the flood risk listCM3 3JH: not on the flood risk listCM3 3JJ: not on the flood risk listCM3 3JL: not on the flood risk listCM3 3JP: not on the flood risk listCM3 3JQ: not on the flood risk listCM3 3JR: not on the flood risk listCM3 3JS: not on the flood risk listCM3 3JT: not on the flood risk listCM3 3JU: not on the flood risk listCM3 3JW: not on the flood risk listCM3 3JZ: not on the flood risk listCM3 3LA: not on the flood risk listCM3 3LB: not on the flood risk listCM3 3LD: not on the flood risk listCM3 3LE: not on the flood risk listCM3 3LF: not on the flood risk listCM3 3LG: not on the flood risk listCM3 3LH: not on the flood risk listCM3 3LJ: not on the flood risk listCM3 3LL: not on the flood risk listCM3 3LP: not on the flood risk listCM3 3LQ: not on the flood risk listCM3 3LR: not on the flood risk listCM3 3LS: not on the flood risk listCM3 3LT: not on the flood risk listCM3 3LU: not on the flood risk listCM3 3LW: not on the flood risk listCM3 3LX: not on the flood risk listCM3 3LY: not on the flood risk listCM3 3LZ: not on the flood risk listCM3 3NA: not on the flood risk listCM3 3NB: not on the flood risk listCM3 3ND: not on the flood risk listCM3 3NE: not on the flood risk listCM3 3NF: not on the flood risk listCM3 3NG: not on the flood risk listCM3 3NH: not on the flood risk listCM3 3NJ: not on the flood risk listCM3 3NQ: not on the flood risk listCM3 3NX: not on the flood risk listCM3 3NY: not on the flood risk listCM3 3NZ: not on the flood risk listCM3 3PA: not on the flood risk listCM3 3PE: not on the flood risk listCM3 3PF: not on the flood risk listCM3 3PG: not on the flood risk listCM3 3PL: not on the flood risk listCM3 3PN: not on the flood risk listCM3 3PP: not on the flood risk listCM3 3PQ: not on the flood risk listCM3 3PR: not on the flood risk listCM3 3PS: not on the flood risk listCM3 3PT: not on the flood risk listCM3 3PW: not on the flood risk listCM3 3PX: not on the flood risk listCM3 3PZ: not on the flood risk listCM3 3QP: not on the flood risk listCM3 3QQ: not on the flood risk listCM3 3QS: not on the flood risk listCM3 3QT: not on the flood risk listCM3 3QU: not on the flood risk listCM3 3QW: not on the flood risk listCM3 3SA: not on the flood risk listCM3 3WL: not on the flood risk listCM3 3PB: low flood risk at worstCM3 3LN: medium flood risk at worstCM3 3NT: medium flood risk at worstCM3 3AU: high flood riskCM3 3AY: high flood riskCM3 3EW: high flood riskCM3 3FY: high flood riskCM3 3NS: high flood riskCM3 3NU: high flood riskCM3 3PJ: high flood risk BroomfieldBoreham Map of every postcode in the CM3 3 sector, by flood risk Of the 207 postcodes in the CM3 3 sector that ONS places, 7 have a home or business at high risk, 2 are at medium risk at worst, 1 are at low risk at worst and 197 are not on the Environment Agency's at-risk list. Places named: Broomfield, Boreham. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A138 BroomfieldBoreham
  • A home or business at high risk: 7
  • At medium risk at worst: 2
  • At low risk at worst: 1
  • At very low risk only: 0
  • Not on the at-risk list: 197

Of the 207 postcodes in the CM3 3 sector that ONS places, 7 have a home or business at high risk, 2 are at medium risk at worst, 1 are at low risk at worst and 197 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.

CM3 3PJ15 at high riskCM3 3NS4 at high riskCM3 3EW3 at high riskCM3 3AU1 at high riskCM3 3AY1 at high riskCM3 3FY1 at high riskCM3 3NU1 at high risk

What do homes sell for in CM3 3?

Homes in CM3 3 sold for a typical £457,500 in the 12 months to August 2026, across 82 sales, down 2.7% on the 12 months before, HM Land Registry's figures show.

£457,500 typical price, the 12 months to August 2026
£470,000 12 months to August 2025
▼ down 2.7% on the 12 months before
  • Detached £525,000 44 sales
  • Semi-detached £397,500 20 sales
  • Terraced £385,000 17 sales
  • 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 CM3 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 CM3 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.

CM3 3AACM3 3ABCM3 3ADCM3 3AECM3 3AFCM3 3AGCM3 3AHCM3 3AJCM3 3ALCM3 3ANCM3 3AQCM3 3ARCM3 3ASCM3 3AUCM3 3AWCM3 3AXCM3 3AYCM3 3AZCM3 3BACM3 3BBCM3 3BDCM3 3BECM3 3BGCM3 3BHCM3 3BNCM3 3BPCM3 3BQCM3 3BSCM3 3BTCM3 3BUCM3 3BWCM3 3BXCM3 3BYCM3 3BZCM3 3DACM3 3DBCM3 3DDCM3 3DECM3 3DFCM3 3DGCM3 3DHCM3 3DJCM3 3DLCM3 3DNCM3 3DPCM3 3DQCM3 3DRCM3 3DSCM3 3DTCM3 3DUCM3 3DXCM3 3DYCM3 3DZCM3 3EACM3 3EBCM3 3EDCM3 3EECM3 3EFCM3 3EGCM3 3EHCM3 3EJCM3 3ENCM3 3EPCM3 3EQCM3 3ERCM3 3EWCM3 3EXCM3 3EYCM3 3EZCM3 3FACM3 3FBCM3 3FECM3 3FFCM3 3FGCM3 3FHCM3 3FLCM3 3FNCM3 3FPCM3 3FQCM3 3FRCM3 3FSCM3 3FTCM3 3FUCM3 3FWCM3 3FXCM3 3FYCM3 3FZCM3 3GACM3 3GDCM3 3GECM3 3GFCM3 3GGCM3 3GHCM3 3GJCM3 3GNCM3 3GPCM3 3GQCM3 3GRCM3 3GSCM3 3GUCM3 3GWCM3 3GXCM3 3GYCM3 3GZCM3 3HACM3 3HBCM3 3HDCM3 3HECM3 3HGCM3 3HHCM3 3HJCM3 3HNCM3 3HQCM3 3HRCM3 3HSCM3 3HTCM3 3HUCM3 3HWCM3 3HXCM3 3HYCM3 3HZCM3 3JACM3 3JBCM3 3JDCM3 3JECM3 3JFCM3 3JGCM3 3JHCM3 3JJCM3 3JLCM3 3JNCM3 3JPCM3 3JQCM3 3JRCM3 3JSCM3 3JTCM3 3JUCM3 3JWCM3 3JZCM3 3LACM3 3LBCM3 3LDCM3 3LECM3 3LFCM3 3LGCM3 3LHCM3 3LJCM3 3LLCM3 3LNCM3 3LPCM3 3LQCM3 3LRCM3 3LSCM3 3LTCM3 3LUCM3 3LWCM3 3LXCM3 3LYCM3 3LZCM3 3NACM3 3NBCM3 3NDCM3 3NECM3 3NFCM3 3NGCM3 3NHCM3 3NJCM3 3NQCM3 3NSCM3 3NTCM3 3NUCM3 3NXCM3 3NYCM3 3NZCM3 3PACM3 3PBCM3 3PDCM3 3PECM3 3PFCM3 3PGCM3 3PHCM3 3PJCM3 3PLCM3 3PNCM3 3PPCM3 3PQCM3 3PRCM3 3PSCM3 3PTCM3 3PWCM3 3PXCM3 3PYCM3 3PZCM3 3QACM3 3QBCM3 3QNCM3 3QPCM3 3QQCM3 3QSCM3 3QTCM3 3QUCM3 3QWCM3 3SACM3 3WLCM3 3WPCM3 3XQCM3 3YA

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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