CM20 3 postcode sector in the CM20 district

CM20 3 is a sector of the CM20 district: every postcode that starts CM20 3. It has 195 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 CM20 3 sector, and which are new since 2020

Map of every postcode in the CM20 3 sector, by new since 2020 Of the 195 postcodes in the CM20 3 sector that ONS places, 2 are new since 2020 and 193 were in use before 2020. Places named: Harlow. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A414A1025 CM20 3AB: before 2020CM20 3AF: before 2020CM20 3AG: before 2020CM20 3AH: before 2020CM20 3AN: before 2020CM20 3AP: before 2020CM20 3AQ: before 2020CM20 3AS: before 2020CM20 3AX: before 2020CM20 3BA: before 2020CM20 3BB: before 2020CM20 3BD: before 2020CM20 3BE: before 2020CM20 3BG: before 2020CM20 3BH: before 2020CM20 3BJ: before 2020CM20 3BL: before 2020CM20 3BN: before 2020CM20 3BQ: before 2020CM20 3BS: before 2020CM20 3BW: before 2020CM20 3BY: before 2020CM20 3DA: before 2020CM20 3DB: before 2020CM20 3DD: before 2020CM20 3DE: before 2020CM20 3DF: before 2020CM20 3DG: before 2020CM20 3DH: before 2020CM20 3DJ: before 2020CM20 3DL: before 2020CM20 3DN: before 2020CM20 3DP: before 2020CM20 3DR: before 2020CM20 3DT: before 2020CM20 3DU: before 2020CM20 3DW: before 2020CM20 3DY: before 2020CM20 3DZ: before 2020CM20 3EA: before 2020CM20 3EB: before 2020CM20 3ED: before 2020CM20 3EE: before 2020CM20 3EF: before 2020CM20 3EG: before 2020CM20 3EH: before 2020CM20 3EJ: before 2020CM20 3EL: before 2020CM20 3EN: before 2020CM20 3EP: before 2020CM20 3ER: before 2020CM20 3ES: before 2020CM20 3ET: before 2020CM20 3EU: before 2020CM20 3EW: before 2020CM20 3EX: before 2020CM20 3EY: before 2020CM20 3EZ: before 2020CM20 3FA: before 2020CM20 3FB: before 2020CM20 3FD: before 2020CM20 3GA: before 2020CM20 3GN: before 2020CM20 3GQ: before 2020CM20 3HB: before 2020CM20 3HD: before 2020CM20 3HE: before 2020CM20 3HF: before 2020CM20 3HG: before 2020CM20 3HH: before 2020CM20 3HJ: before 2020CM20 3HL: before 2020CM20 3HN: before 2020CM20 3HP: before 2020CM20 3HQ: before 2020CM20 3HR: before 2020CM20 3HS: before 2020CM20 3HT: before 2020CM20 3HU: before 2020CM20 3HX: before 2020CM20 3HY: before 2020CM20 3HZ: before 2020CM20 3JA: before 2020CM20 3JB: before 2020CM20 3JD: before 2020CM20 3JE: before 2020CM20 3JF: before 2020CM20 3JH: before 2020CM20 3JJ: before 2020CM20 3JL: before 2020CM20 3JN: before 2020CM20 3JP: before 2020CM20 3JR: before 2020CM20 3JS: before 2020CM20 3JT: before 2020CM20 3JU: before 2020CM20 3JW: before 2020CM20 3JX: before 2020CM20 3JY: before 2020CM20 3LA: before 2020CM20 3LB: before 2020CM20 3LD: before 2020CM20 3LE: before 2020CM20 3LG: before 2020CM20 3LH: before 2020CM20 3LJ: before 2020CM20 3LL: before 2020CM20 3LN: before 2020CM20 3LP: before 2020CM20 3LR: before 2020CM20 3LS: before 2020CM20 3LT: before 2020CM20 3LU: before 2020CM20 3LW: before 2020CM20 3LX: before 2020CM20 3LY: before 2020CM20 3LZ: before 2020CM20 3NA: before 2020CM20 3NB: before 2020CM20 3ND: before 2020CM20 3NE: before 2020CM20 3NG: before 2020CM20 3NH: before 2020CM20 3NJ: before 2020CM20 3NL: before 2020CM20 3NN: before 2020CM20 3NP: before 2020CM20 3NR: before 2020CM20 3NT: before 2020CM20 3NU: before 2020CM20 3NW: before 2020CM20 3NX: before 2020CM20 3PA: before 2020CM20 3PB: before 2020CM20 3PD: before 2020CM20 3PE: before 2020CM20 3PF: before 2020CM20 3PG: before 2020CM20 3PH: before 2020CM20 3PJ: before 2020CM20 3PL: before 2020CM20 3PN: before 2020CM20 3PP: before 2020CM20 3PQ: before 2020CM20 3PR: before 2020CM20 3PS: before 2020CM20 3PT: before 2020CM20 3PU: before 2020CM20 3PX: before 2020CM20 3PY: before 2020CM20 3QA: before 2020CM20 3QB: before 2020CM20 3QD: before 2020CM20 3QE: before 2020CM20 3QF: before 2020CM20 3QG: before 2020CM20 3QH: before 2020CM20 3QJ: before 2020CM20 3QL: before 2020CM20 3QN: before 2020CM20 3QP: before 2020CM20 3QR: before 2020CM20 3QS: before 2020CM20 3QT: before 2020CM20 3QU: before 2020CM20 3QW: before 2020CM20 3QX: before 2020CM20 3QY: before 2020CM20 3RA: before 2020CM20 3RB: before 2020CM20 3RD: before 2020CM20 3RE: before 2020CM20 3RF: before 2020CM20 3RG: before 2020CM20 3RH: before 2020CM20 3RL: before 2020CM20 3RN: before 2020CM20 3RP: before 2020CM20 3RQ: before 2020CM20 3RR: before 2020CM20 3RS: before 2020CM20 3RT: before 2020CM20 3RU: before 2020CM20 3RW: before 2020CM20 3RX: before 2020CM20 3RY: before 2020CM20 3RZ: before 2020CM20 3SA: before 2020CM20 3SD: before 2020CM20 3SX: before 2020CM20 3SY: before 2020CM20 3SZ: before 2020CM20 3FF: new since 2020 Harlow Map of every postcode in the CM20 3 sector, by new since 2020 Of the 195 postcodes in the CM20 3 sector that ONS places, 2 are new since 2020 and 193 were in use before 2020. Places named: Harlow. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Harlow
  • New since 2020: 2
  • In use before 2020: 193

Of the 195 postcodes in the CM20 3 sector that ONS places, 2 are new since 2020 and 193 were in use before 2020.

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. New since 2020 means it came into use in January 2020 or later. 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; when each came into use: the same directory; 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 2 newest postcodes

CM20 3FFMarch 2026CM20 3FGFebruary 2026

What do homes sell for in CM20 3?

Homes in CM20 3 sold for a typical £330,000 in the 12 months to August 2026, across 69 sales, up 4.3% on the 12 months before, HM Land Registry's figures show.

£330,000 typical price, the 12 months to August 2026
£316,250 12 months to August 2025
▲ up 4.3% on the 12 months before
  • Semi-detached £380,000 5 sales
  • Terraced £335,000 55 sales
  • Flat or maisonette £187,500 9 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 CM20 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 CM20 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.

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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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