CO12 4 postcode sector in the CO12 district

CO12 4 is a sector of the CO12 district: every postcode that starts CO12 4. It has 267 postcodes in use, 9 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 CO12 4 sector, by flood risk

Map of every postcode in the CO12 4 sector, by flood risk Of the 267 postcodes in the CO12 4 sector that ONS places, 3 have a home or business at high risk, 1 are at medium risk at worst, 1 are at low risk at worst, 35 are at very low risk only and 227 are not on the Environment Agency's at-risk list. Places named: Harwich. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A120 CO12 4AA: not on the flood risk listCO12 4AB: not on the flood risk listCO12 4AE: not on the flood risk listCO12 4AF: not on the flood risk listCO12 4AG: not on the flood risk listCO12 4AH: not on the flood risk listCO12 4AJ: not on the flood risk listCO12 4AL: not on the flood risk listCO12 4AN: not on the flood risk listCO12 4AP: not on the flood risk listCO12 4AR: not on the flood risk listCO12 4AS: not on the flood risk listCO12 4AT: not on the flood risk listCO12 4AU: not on the flood risk listCO12 4AW: not on the flood risk listCO12 4AX: not on the flood risk listCO12 4AY: not on the flood risk listCO12 4AZ: not on the flood risk listCO12 4BA: not on the flood risk listCO12 4BB: not on the flood risk listCO12 4BE: not on the flood risk listCO12 4BG: not on the flood risk listCO12 4BJ: not on the flood risk listCO12 4BL: not on the flood risk listCO12 4BN: not on the flood risk listCO12 4BQ: not on the flood risk listCO12 4BS: not on the flood risk listCO12 4BT: not on the flood risk listCO12 4BU: not on the flood risk listCO12 4BX: not on the flood risk listCO12 4BY: not on the flood risk listCO12 4DA: not on the flood risk listCO12 4DB: not on the flood risk listCO12 4DD: not on the flood risk listCO12 4DE: not on the flood risk listCO12 4DF: not on the flood risk listCO12 4DH: not on the flood risk listCO12 4DN: not on the flood risk listCO12 4DP: not on the flood risk listCO12 4DR: not on the flood risk listCO12 4DS: not on the flood risk listCO12 4DT: not on the flood risk listCO12 4DU: not on the flood risk listCO12 4DW: not on the flood risk listCO12 4DX: not on the flood risk listCO12 4DY: not on the flood risk listCO12 4EA: not on the flood risk listCO12 4EB: not on the flood risk listCO12 4ED: not on the flood risk listCO12 4EE: not on the flood risk listCO12 4EF: not on the flood risk listCO12 4EG: not on the flood risk listCO12 4EJ: not on the flood risk listCO12 4EP: not on the flood risk listCO12 4EQ: not on the flood risk listCO12 4ER: not on the flood risk listCO12 4ES: not on the flood risk listCO12 4ET: not on the flood risk listCO12 4EX: not on the flood risk listCO12 4EZ: not on the flood risk listCO12 4FB: not on the flood risk listCO12 4FG: not on the flood risk listCO12 4FU: not on the flood risk listCO12 4FX: not on the flood risk listCO12 4FY: not on the flood risk listCO12 4FZ: not on the flood risk listCO12 4GB: not on the flood risk listCO12 4GN: not on the flood risk listCO12 4GT: not on the flood risk listCO12 4GU: not on the flood risk listCO12 4GW: not on the flood risk listCO12 4GX: not on the flood risk listCO12 4GY: not on the flood risk listCO12 4GZ: not on the flood risk listCO12 4HA: not on the flood risk listCO12 4HB: not on the flood risk listCO12 4HD: not on the flood risk listCO12 4HE: not on the flood risk listCO12 4HF: not on the flood risk listCO12 4HG: not on the flood risk listCO12 4HH: not on the flood risk listCO12 4HJ: not on the flood risk listCO12 4HN: not on the flood risk listCO12 4HP: not on the flood risk listCO12 4HR: not on the flood risk listCO12 4HS: not on the flood risk listCO12 4HT: not on the flood risk listCO12 4HX: not on the flood risk listCO12 4HY: not on the flood risk listCO12 4HZ: not on the flood risk listCO12 4JB: not on the flood risk listCO12 4JD: not on the flood risk listCO12 4JE: not on the flood risk listCO12 4JG: not on the flood risk listCO12 4JH: not on the flood risk listCO12 4JJ: not on the flood risk listCO12 4JL: not on the flood risk listCO12 4JN: not on the flood risk listCO12 4JP: not on the flood risk listCO12 4JS: not on the flood risk listCO12 4JT: not on the flood risk listCO12 4JW: not on the flood risk listCO12 4JX: not on the flood risk listCO12 4JY: not on the flood risk listCO12 4JZ: not on the flood risk listCO12 4LA: not on the flood risk listCO12 4LB: not on the flood risk listCO12 4LE: not on the flood risk listCO12 4LG: not on the flood risk listCO12 4LH: not on the flood risk listCO12 4LL: not on the flood risk listCO12 4LN: not on the flood risk listCO12 4LQ: not on the flood risk listCO12 4LS: not on the flood risk listCO12 4LT: not on the flood risk listCO12 4LU: not on the flood risk listCO12 4LW: not on the flood risk listCO12 4LZ: not on the flood risk listCO12 4NA: not on the flood risk listCO12 4NB: not on the flood risk listCO12 4ND: not on the flood risk listCO12 4NE: not on the flood risk listCO12 4NF: not on the flood risk listCO12 4NG: not on the flood risk listCO12 4NH: not on the flood risk listCO12 4NJ: not on the flood risk listCO12 4NL: not on the flood risk listCO12 4NN: not on the flood risk listCO12 4NP: not on the flood risk listCO12 4NR: not on the flood risk listCO12 4NS: not on the flood risk listCO12 4NT: not on the flood risk listCO12 4NU: not on the flood risk listCO12 4NW: not on the flood risk listCO12 4PE: not on the flood risk listCO12 4PG: not on the flood risk listCO12 4PX: not on the flood risk listCO12 4PY: not on the flood risk listCO12 4QA: not on the flood risk listCO12 4QD: not on the flood risk listCO12 4QG: not on the flood risk listCO12 4QP: not on the flood risk listCO12 4QQ: not on the flood risk listCO12 4QR: not on the flood risk listCO12 4QS: not on the flood risk listCO12 4QT: not on the flood risk listCO12 4QU: not on the flood risk listCO12 4QX: not on the flood risk listCO12 4QY: not on the flood risk listCO12 4QZ: not on the flood risk listCO12 4RA: not on the flood risk listCO12 4RB: not on the flood risk listCO12 4RD: not on the flood risk listCO12 4RE: not on the flood risk listCO12 4RF: not on the flood risk listCO12 4RG: not on the flood risk listCO12 4RH: not on the flood risk listCO12 4RJ: not on the flood risk listCO12 4RL: not on the flood risk listCO12 4RN: not on the flood risk listCO12 4RP: not on the flood risk listCO12 4RR: not on the flood risk listCO12 4RS: not on the flood risk listCO12 4RU: not on the flood risk listCO12 4RX: not on the flood risk listCO12 4RZ: not on the flood risk listCO12 4SA: not on the flood risk listCO12 4SB: not on the flood risk listCO12 4TE: not on the flood risk listCO12 4TF: not on the flood risk listCO12 4TH: not on the flood risk listCO12 4TJ: not on the flood risk listCO12 4TL: not on the flood risk listCO12 4TP: not on the flood risk listCO12 4TR: not on the flood risk listCO12 4TS: not on the flood risk listCO12 4TT: not on the flood risk listCO12 4TU: not on the flood risk listCO12 4TX: not on the flood risk listCO12 4TY: not on the flood risk listCO12 4TZ: not on the flood risk listCO12 4UA: not on the flood risk listCO12 4UB: not on the flood risk listCO12 4UD: not on the flood risk listCO12 4UE: not on the flood risk listCO12 4UF: not on the flood risk listCO12 4UG: not on the flood risk listCO12 4UH: not on the flood risk listCO12 4UJ: not on the flood risk listCO12 4UL: not on the flood risk listCO12 4UN: not on the flood risk listCO12 4UP: not on the flood risk listCO12 4UQ: not on the flood risk listCO12 4UR: not on the flood risk listCO12 4US: not on the flood risk listCO12 4UT: not on the flood risk listCO12 4UW: not on the flood risk listCO12 4UX: not on the flood risk listCO12 4UZ: not on the flood risk listCO12 4WE: not on the flood risk listCO12 4WF: not on the flood risk listCO12 4WG: not on the flood risk listCO12 4WH: not on the flood risk listCO12 4WL: not on the flood risk listCO12 4WP: not on the flood risk listCO12 4XA: not on the flood risk listCO12 4XB: not on the flood risk listCO12 4XD: not on the flood risk listCO12 4XE: not on the flood risk listCO12 4XF: not on the flood risk listCO12 4XG: not on the flood risk listCO12 4XH: not on the flood risk listCO12 4XL: not on the flood risk listCO12 4XN: not on the flood risk listCO12 4XP: not on the flood risk listCO12 4XR: not on the flood risk listCO12 4XS: not on the flood risk listCO12 4XT: not on the flood risk listCO12 4XU: not on the flood risk listCO12 4XW: not on the flood risk listCO12 4XX: not on the flood risk listCO12 4YA: not on the flood risk listCO12 4YB: not on the flood risk listCO12 4YD: not on the flood risk listCO12 4YE: not on the flood risk listCO12 4BH: very low flood risk onlyCO12 4BW: very low flood risk onlyCO12 4FE: very low flood risk onlyCO12 4FF: very low flood risk onlyCO12 4FH: very low flood risk onlyCO12 4GA: very low flood risk onlyCO12 4GD: very low flood risk onlyCO12 4GE: very low flood risk onlyCO12 4GF: very low flood risk onlyCO12 4GG: very low flood risk onlyCO12 4GJ: very low flood risk onlyCO12 4GL: very low flood risk onlyCO12 4JU: very low flood risk onlyCO12 4LD: very low flood risk onlyCO12 4LF: very low flood risk onlyCO12 4NX: very low flood risk onlyCO12 4PA: very low flood risk onlyCO12 4PB: very low flood risk onlyCO12 4PD: very low flood risk onlyCO12 4PF: very low flood risk onlyCO12 4PH: very low flood risk onlyCO12 4PL: very low flood risk onlyCO12 4PP: very low flood risk onlyCO12 4PQ: very low flood risk onlyCO12 4PR: very low flood risk onlyCO12 4PS: very low flood risk onlyCO12 4QB: very low flood risk onlyCO12 4SL: very low flood risk onlyCO12 4SP: very low flood risk onlyCO12 4SS: very low flood risk onlyCO12 4SX: very low flood risk onlyCO12 4UU: very low flood risk onlyCO12 4UY: very low flood risk onlyCO12 4XJ: very low flood risk onlyCO12 4EH: low flood risk at worstCO12 4EL: medium flood risk at worstCO12 4EN: high flood riskCO12 4NZ: high flood riskCO12 4PT: high flood risk Harwich Map of every postcode in the CO12 4 sector, by flood risk Of the 267 postcodes in the CO12 4 sector that ONS places, 3 have a home or business at high risk, 1 are at medium risk at worst, 1 are at low risk at worst, 35 are at very low risk only and 227 are not on the Environment Agency's at-risk list. Places named: Harwich. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A120 Harwich
  • A home or business at high risk: 3
  • At medium risk at worst: 1
  • At low risk at worst: 1
  • At very low risk only: 35
  • Not on the at-risk list: 227

Of the 267 postcodes in the CO12 4 sector that ONS places, 3 have a home or business at high risk, 1 are at medium risk at worst, 1 are at low risk at worst, 35 are at very low risk only and 227 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.

CO12 4NZ3 at high riskCO12 4EN1 at high riskCO12 4PT1 at high risk

What do homes sell for in CO12 4?

Homes in CO12 4 sold for a typical £234,000 in the 12 months to August 2026, across 153 sales, down 7.1% on the 12 months before, HM Land Registry's figures show.

£234,000 typical price, the 12 months to August 2026
£252,000 12 months to August 2025
▼ down 7.1% on the 12 months before
  • Detached £316,250 34 sales
  • Semi-detached £237,500 66 sales
  • Terraced £195,500 46 sales
  • Flat or maisonette £122,500 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 CO12 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 CO12 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.

CO12 4AACO12 4ABCO12 4AECO12 4AFCO12 4AGCO12 4AHCO12 4AJCO12 4ALCO12 4ANCO12 4APCO12 4ARCO12 4ASCO12 4ATCO12 4AUCO12 4AWCO12 4AXCO12 4AYCO12 4AZCO12 4BACO12 4BBCO12 4BECO12 4BGCO12 4BHCO12 4BJCO12 4BLCO12 4BNCO12 4BQCO12 4BSCO12 4BTCO12 4BUCO12 4BWCO12 4BXCO12 4BYCO12 4DACO12 4DBCO12 4DDCO12 4DECO12 4DFCO12 4DHCO12 4DNCO12 4DPCO12 4DRCO12 4DSCO12 4DTCO12 4DUCO12 4DWCO12 4DXCO12 4DYCO12 4EACO12 4EBCO12 4EDCO12 4EECO12 4EFCO12 4EGCO12 4EHCO12 4EJCO12 4ELCO12 4ENCO12 4EPCO12 4EQCO12 4ERCO12 4ESCO12 4ETCO12 4EXCO12 4EZCO12 4FBCO12 4FECO12 4FFCO12 4FGCO12 4FHCO12 4FUCO12 4FXCO12 4FYCO12 4FZCO12 4GACO12 4GBCO12 4GDCO12 4GECO12 4GFCO12 4GGCO12 4GJCO12 4GLCO12 4GNCO12 4GTCO12 4GUCO12 4GWCO12 4GXCO12 4GYCO12 4GZCO12 4HACO12 4HBCO12 4HDCO12 4HECO12 4HFCO12 4HGCO12 4HHCO12 4HJCO12 4HNCO12 4HPCO12 4HRCO12 4HSCO12 4HTCO12 4HWCO12 4HXCO12 4HYCO12 4HZCO12 4JBCO12 4JDCO12 4JECO12 4JGCO12 4JHCO12 4JJCO12 4JLCO12 4JNCO12 4JPCO12 4JSCO12 4JTCO12 4JUCO12 4JWCO12 4JXCO12 4JYCO12 4JZCO12 4LACO12 4LBCO12 4LDCO12 4LECO12 4LFCO12 4LGCO12 4LHCO12 4LLCO12 4LNCO12 4LQCO12 4LSCO12 4LTCO12 4LUCO12 4LWCO12 4LZCO12 4NACO12 4NBCO12 4NDCO12 4NECO12 4NFCO12 4NGCO12 4NHCO12 4NJCO12 4NLCO12 4NNCO12 4NPCO12 4NRCO12 4NSCO12 4NTCO12 4NUCO12 4NWCO12 4NXCO12 4NZCO12 4PACO12 4PBCO12 4PDCO12 4PECO12 4PFCO12 4PGCO12 4PHCO12 4PLCO12 4PPCO12 4PQCO12 4PRCO12 4PSCO12 4PTCO12 4PXCO12 4PYCO12 4QACO12 4QBCO12 4QDCO12 4QGCO12 4QPCO12 4QQCO12 4QRCO12 4QSCO12 4QTCO12 4QUCO12 4QXCO12 4QYCO12 4QZCO12 4RACO12 4RBCO12 4RDCO12 4RECO12 4RFCO12 4RGCO12 4RHCO12 4RJCO12 4RLCO12 4RNCO12 4RPCO12 4RRCO12 4RSCO12 4RUCO12 4RXCO12 4RZCO12 4SACO12 4SBCO12 4SDCO12 4SLCO12 4SPCO12 4SRCO12 4SSCO12 4SXCO12 4TECO12 4TFCO12 4THCO12 4TJCO12 4TLCO12 4TPCO12 4TRCO12 4TSCO12 4TTCO12 4TUCO12 4TXCO12 4TYCO12 4TZCO12 4UACO12 4UBCO12 4UDCO12 4UECO12 4UFCO12 4UGCO12 4UHCO12 4UJCO12 4ULCO12 4UNCO12 4UPCO12 4UQCO12 4URCO12 4USCO12 4UTCO12 4UUCO12 4UWCO12 4UXCO12 4UYCO12 4UZCO12 4WECO12 4WFCO12 4WGCO12 4WHCO12 4WLCO12 4WPCO12 4XACO12 4XBCO12 4XDCO12 4XECO12 4XFCO12 4XGCO12 4XHCO12 4XJCO12 4XLCO12 4XNCO12 4XPCO12 4XRCO12 4XSCO12 4XTCO12 4XUCO12 4XWCO12 4XXCO12 4YACO12 4YBCO12 4YDCO12 4YE

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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