CO12 3 postcode sector in the CO12 district

CO12 3 is a sector of the CO12 district: every postcode that starts CO12 3. It has 226 postcodes in use, 6 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 3 sector, by flood risk

Map of every postcode in the CO12 3 sector, by flood risk Of the 226 postcodes in the CO12 3 sector that ONS places, 23 have a home or business at high risk, 25 are at medium risk at worst, 47 are at low risk at worst, 20 are at very low risk only and 111 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 44 postcodes at high or medium risk. Places named: Harwich. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A120 CO12 3AA: not on the flood risk listCO12 3AB: not on the flood risk listCO12 3AH: not on the flood risk listCO12 3AJ: not on the flood risk listCO12 3AU: not on the flood risk listCO12 3AX: not on the flood risk listCO12 3BG: not on the flood risk listCO12 3BQ: not on the flood risk listCO12 3DF: not on the flood risk listCO12 3DP: not on the flood risk listCO12 3DU: not on the flood risk listCO12 3EQ: not on the flood risk listCO12 3EY: not on the flood risk listCO12 3FD: not on the flood risk listCO12 3FF: not on the flood risk listCO12 3FG: not on the flood risk listCO12 3FH: not on the flood risk listCO12 3FJ: not on the flood risk listCO12 3FL: not on the flood risk listCO12 3FS: not on the flood risk listCO12 3GT: not on the flood risk listCO12 3HJ: not on the flood risk listCO12 3JR: not on the flood risk listCO12 3JT: not on the flood risk listCO12 3JX: not on the flood risk listCO12 3JY: not on the flood risk listCO12 3JZ: not on the flood risk listCO12 3LA: not on the flood risk listCO12 3LF: not on the flood risk listCO12 3LG: not on the flood risk listCO12 3LL: not on the flood risk listCO12 3LR: not on the flood risk listCO12 3NN: not on the flood risk listCO12 3NP: not on the flood risk listCO12 3NQ: not on the flood risk listCO12 3NS: not on the flood risk listCO12 3NW: not on the flood risk listCO12 3PA: not on the flood risk listCO12 3PB: not on the flood risk listCO12 3PD: not on the flood risk listCO12 3PF: not on the flood risk listCO12 3PH: not on the flood risk listCO12 3PL: not on the flood risk listCO12 3PN: not on the flood risk listCO12 3PP: not on the flood risk listCO12 3PQ: not on the flood risk listCO12 3PR: not on the flood risk listCO12 3PS: not on the flood risk listCO12 3PT: not on the flood risk listCO12 3PU: not on the flood risk listCO12 3PW: not on the flood risk listCO12 3PY: not on the flood risk listCO12 3PZ: not on the flood risk listCO12 3QA: not on the flood risk listCO12 3QB: not on the flood risk listCO12 3QE: not on the flood risk listCO12 3QF: not on the flood risk listCO12 3QG: not on the flood risk listCO12 3QH: not on the flood risk listCO12 3QJ: not on the flood risk listCO12 3QL: not on the flood risk listCO12 3QN: not on the flood risk listCO12 3QP: not on the flood risk listCO12 3QQ: not on the flood risk listCO12 3QT: not on the flood risk listCO12 3QU: not on the flood risk listCO12 3QW: not on the flood risk listCO12 3RA: not on the flood risk listCO12 3RD: not on the flood risk listCO12 3RF: not on the flood risk listCO12 3RG: not on the flood risk listCO12 3RH: not on the flood risk listCO12 3RJ: not on the flood risk listCO12 3RL: not on the flood risk listCO12 3RN: not on the flood risk listCO12 3RP: not on the flood risk listCO12 3RR: not on the flood risk listCO12 3RS: not on the flood risk listCO12 3RW: not on the flood risk listCO12 3RY: not on the flood risk listCO12 3SA: not on the flood risk listCO12 3SB: not on the flood risk listCO12 3SE: not on the flood risk listCO12 3SG: not on the flood risk listCO12 3SH: not on the flood risk listCO12 3SJ: not on the flood risk listCO12 3SP: not on the flood risk listCO12 3SQ: not on the flood risk listCO12 3SR: not on the flood risk listCO12 3SS: not on the flood risk listCO12 3TB: not on the flood risk listCO12 3TD: not on the flood risk listCO12 3TE: not on the flood risk listCO12 3TG: not on the flood risk listCO12 3TH: not on the flood risk listCO12 3TJ: not on the flood risk listCO12 3TL: not on the flood risk listCO12 3TQ: not on the flood risk listCO12 3TX: not on the flood risk listCO12 3UA: not on the flood risk listCO12 3UB: not on the flood risk listCO12 3UD: not on the flood risk listCO12 3UE: not on the flood risk listCO12 3UF: not on the flood risk listCO12 3UH: not on the flood risk listCO12 3UJ: not on the flood risk listCO12 3UL: not on the flood risk listCO12 3AG: very low flood risk onlyCO12 3AL: very low flood risk onlyCO12 3AP: very low flood risk onlyCO12 3AR: very low flood risk onlyCO12 3AS: very low flood risk onlyCO12 3AW: very low flood risk onlyCO12 3BA: very low flood risk onlyCO12 3BB: very low flood risk onlyCO12 3BH: very low flood risk onlyCO12 3EL: very low flood risk onlyCO12 3ET: very low flood risk onlyCO12 3LH: very low flood risk onlyCO12 3LS: very low flood risk onlyCO12 3NR: very low flood risk onlyCO12 3RZ: very low flood risk onlyCO12 3SL: very low flood risk onlyCO12 3TN: very low flood risk onlyCO12 3TP: very low flood risk onlyCO12 3TR: very low flood risk onlyCO12 3TW: very low flood risk onlyCO12 3AT: low flood risk at worstCO12 3BJ: low flood risk at worstCO12 3BZ: low flood risk at worstCO12 3DJ: low flood risk at worstCO12 3DL: low flood risk at worstCO12 3DQ: low flood risk at worstCO12 3DR: low flood risk at worstCO12 3DS: low flood risk at worstCO12 3DX: low flood risk at worstCO12 3EF: low flood risk at worstCO12 3EG: low flood risk at worstCO12 3FQ: low flood risk at worstCO12 3FR: low flood risk at worstCO12 3GS: low flood risk at worstCO12 3HG: low flood risk at worstCO12 3HL: low flood risk at worstCO12 3HP: low flood risk at worstCO12 3HQ: low flood risk at worstCO12 3HR: low flood risk at worstCO12 3HS: low flood risk at worstCO12 3HU: low flood risk at worstCO12 3HX: low flood risk at worstCO12 3HY: low flood risk at worstCO12 3HZ: low flood risk at worstCO12 3JA: low flood risk at worstCO12 3JB: low flood risk at worstCO12 3JD: low flood risk at worstCO12 3JE: low flood risk at worstCO12 3JG: low flood risk at worstCO12 3JQ: low flood risk at worstCO12 3LB: low flood risk at worstCO12 3LD: low flood risk at worstCO12 3LT: low flood risk at worstCO12 3NG: low flood risk at worstCO12 3NH: low flood risk at worstCO12 3SD: low flood risk at worstCO12 3SN: low flood risk at worstCO12 3SU: low flood risk at worstCO12 3SW: low flood risk at worstCO12 3SX: low flood risk at worstCO12 3SZ: low flood risk at worstCO12 3TA: low flood risk at worstCO12 3TS: low flood risk at worstCO12 3TT: low flood risk at worstCO12 3TZ: low flood risk at worstCO12 3BD: medium flood risk at worstCO12 3BN: medium flood risk at worstCO12 3BS: medium flood risk at worstCO12 3BW: medium flood risk at worstCO12 3DA: medium flood risk at worstCO12 3DB: medium flood risk at worstCO12 3DE: medium flood risk at worstCO12 3DT: medium flood risk at worstCO12 3DY: medium flood risk at worstCO12 3EE: medium flood risk at worstCO12 3ER: medium flood risk at worstCO12 3ES: medium flood risk at worstCO12 3EU: medium flood risk at worstCO12 3EX: medium flood risk at worstCO12 3EZ: medium flood risk at worstCO12 3HA: medium flood risk at worstCO12 3HN: medium flood risk at worstCO12 3HT: medium flood risk at worstCO12 3HW: medium flood risk at worstCO12 3LJ: medium flood risk at worstCO12 3LP: medium flood risk at worstCO12 3LZ: medium flood risk at worstCO12 3ND: medium flood risk at worstCO12 3NE: medium flood risk at worstCO12 3RX: medium flood risk at worstCO12 3BP: high flood riskCO12 3DD: high flood riskCO12 3DG: high flood riskCO12 3EA: high flood riskCO12 3ED: high flood riskCO12 3EJ: high flood riskCO12 3EN: high flood riskCO12 3FN: high flood riskCO12 3FP: high flood riskCO12 3HB: high flood riskCO12 3HF: high flood riskCO12 3HH: high flood riskCO12 3JJ: high flood riskCO12 3JW: high flood riskCO12 3LU: high flood riskCO12 3LX: high flood riskCO12 3LY: high flood riskCO12 3NF: high flood riskCO12 3NJ: high flood riskCO12 3NL: high flood riskCO12 3NY: high flood riskCO12 3SF: high flood riskCO12 3ST: high flood risk Harwich 44 postcodes at high or medium risk, outlined: this goes to CO12 3HH, the one with most homes and businesses at high risk44 postcodes at high or medium risk Map of every postcode in the CO12 3 sector, by flood risk Of the 226 postcodes in the CO12 3 sector that ONS places, 23 have a home or business at high risk, 25 are at medium risk at worst, 47 are at low risk at worst, 20 are at very low risk only and 111 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 44 postcodes at high or medium risk. 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: 23
  • At medium risk at worst: 25
  • At low risk at worst: 47
  • At very low risk only: 20
  • Not on the at-risk list: 111
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 226 postcodes in the CO12 3 sector that ONS places, 23 have a home or business at high risk, 25 are at medium risk at worst, 47 are at low risk at worst, 20 are at very low risk only and 111 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

23 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.

CO12 3HH22 at high riskCO12 3LU19 at high riskCO12 3NJ10 at high riskCO12 3FP9 at high riskCO12 3LX8 at high riskCO12 3EA6 at high riskCO12 3ST6 at high riskCO12 3NL5 at high riskCO12 3HF5 at high riskCO12 3EN5 at high riskCO12 3LY4 at high riskCO12 3BP4 at high risk

Where the postcodes at high or medium risk lie together

  • 44 postcodes at high or medium risk, outlined on the map. CO12 3HH, is the one with most homes and businesses at high risk.

What do homes sell for in CO12 3?

Homes in CO12 3 sold for a typical £226,250 in the 12 months to August 2026, across 92 sales, down 3.7% on the 12 months before, HM Land Registry's figures show.

£226,250 typical price, the 12 months to August 2026
£235,000 12 months to August 2025
▼ down 3.7% on the 12 months before
  • Detached £340,000 25 sales
  • Semi-detached £235,000 10 sales
  • Terraced £191,250 42 sales
  • Flat or maisonette £133,000 15 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 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 CO12 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.

CO12 3AACO12 3ABCO12 3AGCO12 3AHCO12 3AJCO12 3ALCO12 3APCO12 3ARCO12 3ASCO12 3ATCO12 3AUCO12 3AWCO12 3AXCO12 3BACO12 3BBCO12 3BDCO12 3BECO12 3BGCO12 3BHCO12 3BJCO12 3BNCO12 3BPCO12 3BQCO12 3BSCO12 3BWCO12 3BZCO12 3DACO12 3DBCO12 3DDCO12 3DECO12 3DFCO12 3DGCO12 3DJCO12 3DLCO12 3DPCO12 3DQCO12 3DRCO12 3DSCO12 3DTCO12 3DUCO12 3DXCO12 3DYCO12 3EACO12 3EBCO12 3EDCO12 3EECO12 3EFCO12 3EGCO12 3EJCO12 3ELCO12 3ENCO12 3EQCO12 3ERCO12 3ESCO12 3ETCO12 3EUCO12 3EXCO12 3EYCO12 3EZCO12 3FDCO12 3FFCO12 3FGCO12 3FHCO12 3FJCO12 3FLCO12 3FNCO12 3FPCO12 3FQCO12 3FRCO12 3FSCO12 3GSCO12 3GTCO12 3HACO12 3HBCO12 3HFCO12 3HGCO12 3HHCO12 3HJCO12 3HLCO12 3HNCO12 3HPCO12 3HQCO12 3HRCO12 3HSCO12 3HTCO12 3HUCO12 3HWCO12 3HXCO12 3HYCO12 3HZCO12 3JACO12 3JBCO12 3JDCO12 3JECO12 3JFCO12 3JGCO12 3JJCO12 3JQCO12 3JRCO12 3JTCO12 3JWCO12 3JXCO12 3JYCO12 3JZCO12 3LACO12 3LBCO12 3LDCO12 3LFCO12 3LGCO12 3LHCO12 3LJCO12 3LLCO12 3LPCO12 3LRCO12 3LSCO12 3LTCO12 3LUCO12 3LXCO12 3LYCO12 3LZCO12 3NDCO12 3NECO12 3NFCO12 3NGCO12 3NHCO12 3NJCO12 3NLCO12 3NNCO12 3NPCO12 3NQCO12 3NRCO12 3NSCO12 3NWCO12 3NYCO12 3PACO12 3PBCO12 3PDCO12 3PECO12 3PFCO12 3PHCO12 3PJCO12 3PLCO12 3PNCO12 3PPCO12 3PQCO12 3PRCO12 3PSCO12 3PTCO12 3PUCO12 3PWCO12 3PXCO12 3PYCO12 3PZCO12 3QACO12 3QBCO12 3QECO12 3QFCO12 3QGCO12 3QHCO12 3QJCO12 3QLCO12 3QNCO12 3QPCO12 3QQCO12 3QTCO12 3QUCO12 3QWCO12 3RACO12 3RDCO12 3RFCO12 3RGCO12 3RHCO12 3RJCO12 3RLCO12 3RNCO12 3RPCO12 3RRCO12 3RSCO12 3RWCO12 3RXCO12 3RYCO12 3RZCO12 3SACO12 3SBCO12 3SDCO12 3SECO12 3SFCO12 3SGCO12 3SHCO12 3SJCO12 3SLCO12 3SNCO12 3SPCO12 3SQCO12 3SRCO12 3SSCO12 3STCO12 3SUCO12 3SWCO12 3SXCO12 3SZCO12 3TACO12 3TBCO12 3TDCO12 3TECO12 3TGCO12 3THCO12 3TJCO12 3TLCO12 3TNCO12 3TPCO12 3TQCO12 3TRCO12 3TSCO12 3TTCO12 3TWCO12 3TXCO12 3TZCO12 3UACO12 3UBCO12 3UDCO12 3UECO12 3UFCO12 3UHCO12 3UJCO12 3UL

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.

Check a postcode

Something wrong on this page? Report an error and we will check it against the source.