CM20 9 postcode sector in the CM20 district

CM20 9 is a sector of the CM20 district: every postcode that starts CM20 9. It has 69 postcodes in use, 58 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 CM20 9 sector, by flood risk

Map of every postcode in the CM20 9 sector, by flood risk Of the 69 postcodes in the CM20 9 sector that ONS places, 69 are not on the Environment Agency's at-risk list. Places named: Harlow. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A1025A1169 CM20 9AH: not on the flood risk listCM20 9SA: not on the flood risk listCM20 9SB: not on the flood risk list Harlow Map of every postcode in the CM20 9 sector, by flood risk Of the 69 postcodes in the CM20 9 sector that ONS places, 69 are not on the Environment Agency's at-risk list. Places named: Harlow. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A1025 Harlow
  • A home or business at high risk: 0
  • At medium risk at worst: 0
  • At low risk at worst: 0
  • At very low risk only: 0
  • Not on the at-risk list: 69

Of the 69 postcodes in the CM20 9 sector that ONS places, 69 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

Postcodes in CM20 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.

CM20 9AHCM20 9AWCM20 9GYCM20 9JGCM20 9LGCM20 9LYCM20 9NACM20 9NGCM20 9NHCM20 9NPCM20 9NRCM20 9NSCM20 9NUCM20 9PPCM20 9PZCM20 9QECM20 9QFCM20 9QHCM20 9QJCM20 9QPCM20 9QQCM20 9QRCM20 9QTCM20 9QXCM20 9QZCM20 9RTCM20 9RWCM20 9RYCM20 9RZCM20 9SACM20 9SBCM20 9SDCM20 9SECM20 9SFCM20 9SGCM20 9SHCM20 9SJCM20 9SLCM20 9SNCM20 9SPCM20 9SQCM20 9SRCM20 9TACM20 9TDCM20 9TECM20 9TFCM20 9TGCM20 9TRCM20 9TTCM20 9UBCM20 9UDCM20 9UFCM20 9UGCM20 9UHCM20 9UJCM20 9ULCM20 9UUCM20 9WACM20 9WHCM20 9WNCM20 9WPCM20 9WSCM20 9WUCM20 9WXCM20 9XECM20 9XFCM20 9XSCM20 9XTCM20 9ZZ

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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