CO3 3 postcode sector in the CO3 district

CO3 3 is a sector of the CO3 district: every postcode that starts CO3 3. It has 231 postcodes in use, 8 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 CO3 3 sector, by flood risk

Map of every postcode in the CO3 3 sector, by flood risk Of the 231 postcodes in the CO3 3 sector that ONS places, 1 have a home or business at high risk, 1 are at medium risk at worst, 3 are at low risk at worst and 226 are not on the Environment Agency's at-risk list. One postcode lies beyond the edge and is listed under the map. Places named: Colchester. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A133 CO3 3AA: not on the flood risk listCO3 3AB: not on the flood risk listCO3 3AD: not on the flood risk listCO3 3AE: not on the flood risk listCO3 3AF: not on the flood risk listCO3 3AG: not on the flood risk listCO3 3AH: not on the flood risk listCO3 3AJ: not on the flood risk listCO3 3AL: not on the flood risk listCO3 3AN: not on the flood risk listCO3 3AP: not on the flood risk listCO3 3AQ: not on the flood risk listCO3 3AR: not on the flood risk listCO3 3AS: not on the flood risk listCO3 3AT: not on the flood risk listCO3 3AU: not on the flood risk listCO3 3AW: not on the flood risk listCO3 3AX: not on the flood risk listCO3 3AY: not on the flood risk listCO3 3AZ: not on the flood risk listCO3 3BA: not on the flood risk listCO3 3BB: not on the flood risk listCO3 3BD: not on the flood risk listCO3 3BE: not on the flood risk listCO3 3BG: not on the flood risk listCO3 3BH: not on the flood risk listCO3 3BJ: not on the flood risk listCO3 3BL: not on the flood risk listCO3 3BN: not on the flood risk listCO3 3BP: not on the flood risk listCO3 3BQ: not on the flood risk listCO3 3BT: not on the flood risk listCO3 3BU: not on the flood risk listCO3 3BW: not on the flood risk listCO3 3BZ: not on the flood risk listCO3 3DA: not on the flood risk listCO3 3DB: not on the flood risk listCO3 3DD: not on the flood risk listCO3 3DE: not on the flood risk listCO3 3DF: not on the flood risk listCO3 3DG: not on the flood risk listCO3 3DH: not on the flood risk listCO3 3DJ: not on the flood risk listCO3 3DL: not on the flood risk listCO3 3DN: not on the flood risk listCO3 3DP: not on the flood risk listCO3 3DQ: not on the flood risk listCO3 3DR: not on the flood risk listCO3 3DS: not on the flood risk listCO3 3DT: not on the flood risk listCO3 3DU: not on the flood risk listCO3 3DW: not on the flood risk listCO3 3DX: not on the flood risk listCO3 3DY: not on the flood risk listCO3 3DZ: not on the flood risk listCO3 3EA: not on the flood risk listCO3 3EB: not on the flood risk listCO3 3ED: not on the flood risk listCO3 3EE: not on the flood risk listCO3 3EJ: not on the flood risk listCO3 3EN: not on the flood risk listCO3 3ES: not on the flood risk listCO3 3EY: not on the flood risk listCO3 3EZ: not on the flood risk listCO3 3FA: not on the flood risk listCO3 3FF: not on the flood risk listCO3 3FG: not on the flood risk listCO3 3FJ: not on the flood risk listCO3 3FL: not on the flood risk listCO3 3FN: not on the flood risk listCO3 3FP: not on the flood risk listCO3 3FQ: not on the flood risk listCO3 3GB: not on the flood risk listCO3 3GE: not on the flood risk listCO3 3GT: not on the flood risk listCO3 3GW: not on the flood risk listCO3 3HA: not on the flood risk listCO3 3HD: not on the flood risk listCO3 3HE: not on the flood risk listCO3 3HF: not on the flood risk listCO3 3HH: not on the flood risk listCO3 3HJ: not on the flood risk listCO3 3HL: not on the flood risk listCO3 3HN: not on the flood risk listCO3 3HP: not on the flood risk listCO3 3HQ: not on the flood risk listCO3 3HR: not on the flood risk listCO3 3HT: not on the flood risk listCO3 3HU: not on the flood risk listCO3 3HW: not on the flood risk listCO3 3HX: not on the flood risk listCO3 3HY: not on the flood risk listCO3 3JA: not on the flood risk listCO3 3JB: not on the flood risk listCO3 3JD: not on the flood risk listCO3 3JE: not on the flood risk listCO3 3JF: not on the flood risk listCO3 3JG: not on the flood risk listCO3 3JH: not on the flood risk listCO3 3JJ: not on the flood risk listCO3 3JN: not on the flood risk listCO3 3JQ: not on the flood risk listCO3 3JR: not on the flood risk listCO3 3JW: not on the flood risk listCO3 3LE: not on the flood risk listCO3 3LF: not on the flood risk listCO3 3LL: not on the flood risk listCO3 3LT: not on the flood risk listCO3 3LU: not on the flood risk listCO3 3LX: not on the flood risk listCO3 3LY: not on the flood risk listCO3 3LZ: not on the flood risk listCO3 3NA: not on the flood risk listCO3 3ND: not on the flood risk listCO3 3NE: not on the flood risk listCO3 3NF: not on the flood risk listCO3 3NG: not on the flood risk listCO3 3NH: not on the flood risk listCO3 3NL: not on the flood risk listCO3 3NN: not on the flood risk listCO3 3NP: not on the flood risk listCO3 3NR: not on the flood risk listCO3 3NS: not on the flood risk listCO3 3NT: not on the flood risk listCO3 3NU: not on the flood risk listCO3 3NX: not on the flood risk listCO3 3NY: not on the flood risk listCO3 3NZ: not on the flood risk listCO3 3PA: not on the flood risk listCO3 3PB: not on the flood risk listCO3 3PD: not on the flood risk listCO3 3PE: not on the flood risk listCO3 3PH: not on the flood risk listCO3 3PJ: not on the flood risk listCO3 3PL: not on the flood risk listCO3 3PN: not on the flood risk listCO3 3PR: not on the flood risk listCO3 3PS: not on the flood risk listCO3 3PT: not on the flood risk listCO3 3PW: not on the flood risk listCO3 3PX: not on the flood risk listCO3 3PY: not on the flood risk listCO3 3PZ: not on the flood risk listCO3 3QA: not on the flood risk listCO3 3QD: not on the flood risk listCO3 3QE: not on the flood risk listCO3 3QF: not on the flood risk listCO3 3QG: not on the flood risk listCO3 3QH: not on the flood risk listCO3 3QJ: not on the flood risk listCO3 3QL: not on the flood risk listCO3 3QN: not on the flood risk listCO3 3QP: not on the flood risk listCO3 3QQ: not on the flood risk listCO3 3QR: not on the flood risk listCO3 3QS: not on the flood risk listCO3 3QT: not on the flood risk listCO3 3QU: not on the flood risk listCO3 3QW: not on the flood risk listCO3 3QX: not on the flood risk listCO3 3QY: not on the flood risk listCO3 3RA: not on the flood risk listCO3 3RB: not on the flood risk listCO3 3RD: not on the flood risk listCO3 3RF: not on the flood risk listCO3 3RG: not on the flood risk listCO3 3RH: not on the flood risk listCO3 3RL: not on the flood risk listCO3 3RN: not on the flood risk listCO3 3RP: not on the flood risk listCO3 3RQ: not on the flood risk listCO3 3RR: not on the flood risk listCO3 3RS: not on the flood risk listCO3 3RT: not on the flood risk listCO3 3RU: not on the flood risk listCO3 3RW: not on the flood risk listCO3 3RX: not on the flood risk listCO3 3RY: not on the flood risk listCO3 3RZ: not on the flood risk listCO3 3SA: not on the flood risk listCO3 3SD: not on the flood risk listCO3 3SE: not on the flood risk listCO3 3SF: not on the flood risk listCO3 3SG: not on the flood risk listCO3 3SH: not on the flood risk listCO3 3SJ: not on the flood risk listCO3 3SP: not on the flood risk listCO3 3SQ: not on the flood risk listCO3 3SR: not on the flood risk listCO3 3SS: not on the flood risk listCO3 3ST: not on the flood risk listCO3 3SU: not on the flood risk listCO3 3SX: not on the flood risk listCO3 3SY: not on the flood risk listCO3 3SZ: not on the flood risk listCO3 3TA: not on the flood risk listCO3 3TB: not on the flood risk listCO3 3TD: not on the flood risk listCO3 3TE: not on the flood risk listCO3 3TF: not on the flood risk listCO3 3TJ: not on the flood risk listCO3 3TL: not on the flood risk listCO3 3TN: not on the flood risk listCO3 3TP: not on the flood risk listCO3 3TR: not on the flood risk listCO3 3TS: not on the flood risk listCO3 3TT: not on the flood risk listCO3 3TU: not on the flood risk listCO3 3TW: not on the flood risk listCO3 3TX: not on the flood risk listCO3 3TY: not on the flood risk listCO3 3TZ: not on the flood risk listCO3 3UA: not on the flood risk listCO3 3UB: not on the flood risk listCO3 3UD: not on the flood risk listCO3 3UE: not on the flood risk listCO3 3UF: not on the flood risk listCO3 3UJ: not on the flood risk listCO3 3UL: not on the flood risk listCO3 3UN: not on the flood risk listCO3 3US: not on the flood risk listCO3 3UZ: not on the flood risk listCO3 3WD: not on the flood risk listCO3 3WL: not on the flood risk listCO3 3LG: low flood risk at worstCO3 3XL: low flood risk at worstCO3 3LD: medium flood risk at worstCO3 3WG: high flood risk Colchester Map of every postcode in the CO3 3 sector, by flood risk Of the 231 postcodes in the CO3 3 sector that ONS places, 1 have a home or business at high risk, 1 are at medium risk at worst, 3 are at low risk at worst and 226 are not on the Environment Agency's at-risk list. One postcode lies beyond the edge and is listed under the map. Places named: Colchester. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A133 Colchester
  • A home or business at high risk: 1
  • At medium risk at worst: 1
  • At low risk at worst: 3
  • At very low risk only: 0
  • Not on the at-risk list: 226

Of the 231 postcodes in the CO3 3 sector that ONS places, 1 have a home or business at high risk, 1 are at medium risk at worst, 3 are at low risk at worst and 226 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.

CO3 3WG2 at high risk

Further out, not drawn

This postcode lies well apart from the rest, so the map is drawn without it to show the rest closer; it is in every count.

CO3 3YB

What do homes sell for in CO3 3?

Homes in CO3 3 sold for a typical £312,500 in the 12 months to August 2026, across 107 sales, up 0.8% on the 12 months before, HM Land Registry's figures show.

£312,500 typical price, the 12 months to August 2026
£310,000 12 months to August 2025
▲ up 0.8% on the 12 months before
  • Detached £581,000 28 sales
  • Semi-detached £386,000 22 sales
  • Terraced £282,500 20 sales
  • Flat or maisonette £175,000 37 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 CO3 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 CO3 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.

CO3 3AACO3 3ABCO3 3ADCO3 3AECO3 3AFCO3 3AGCO3 3AHCO3 3AJCO3 3ALCO3 3ANCO3 3APCO3 3AQCO3 3ARCO3 3ASCO3 3ATCO3 3AUCO3 3AWCO3 3AXCO3 3AYCO3 3AZCO3 3BACO3 3BBCO3 3BDCO3 3BECO3 3BGCO3 3BHCO3 3BJCO3 3BLCO3 3BNCO3 3BPCO3 3BQCO3 3BTCO3 3BUCO3 3BWCO3 3BZCO3 3DACO3 3DBCO3 3DDCO3 3DECO3 3DFCO3 3DGCO3 3DHCO3 3DJCO3 3DLCO3 3DNCO3 3DPCO3 3DQCO3 3DRCO3 3DSCO3 3DTCO3 3DUCO3 3DWCO3 3DXCO3 3DYCO3 3DZCO3 3EACO3 3EBCO3 3EDCO3 3EECO3 3EJCO3 3ENCO3 3ESCO3 3EYCO3 3EZCO3 3FACO3 3FFCO3 3FGCO3 3FJCO3 3FLCO3 3FNCO3 3FPCO3 3FQCO3 3GBCO3 3GECO3 3GTCO3 3GWCO3 3HACO3 3HDCO3 3HECO3 3HFCO3 3HHCO3 3HJCO3 3HLCO3 3HNCO3 3HPCO3 3HQCO3 3HRCO3 3HTCO3 3HUCO3 3HWCO3 3HXCO3 3HYCO3 3JACO3 3JBCO3 3JDCO3 3JECO3 3JFCO3 3JGCO3 3JHCO3 3JJCO3 3JNCO3 3JQCO3 3JRCO3 3JWCO3 3LDCO3 3LECO3 3LFCO3 3LGCO3 3LJCO3 3LLCO3 3LTCO3 3LUCO3 3LXCO3 3LYCO3 3LZCO3 3NACO3 3NDCO3 3NECO3 3NFCO3 3NGCO3 3NHCO3 3NLCO3 3NNCO3 3NPCO3 3NRCO3 3NSCO3 3NTCO3 3NUCO3 3NWCO3 3NXCO3 3NYCO3 3NZCO3 3PACO3 3PBCO3 3PDCO3 3PECO3 3PHCO3 3PJCO3 3PLCO3 3PNCO3 3PRCO3 3PSCO3 3PTCO3 3PWCO3 3PXCO3 3PYCO3 3PZCO3 3QACO3 3QDCO3 3QECO3 3QFCO3 3QGCO3 3QHCO3 3QJCO3 3QLCO3 3QNCO3 3QPCO3 3QQCO3 3QRCO3 3QSCO3 3QTCO3 3QUCO3 3QWCO3 3QXCO3 3QYCO3 3RACO3 3RBCO3 3RDCO3 3RFCO3 3RGCO3 3RHCO3 3RLCO3 3RNCO3 3RPCO3 3RQCO3 3RRCO3 3RSCO3 3RTCO3 3RUCO3 3RWCO3 3RXCO3 3RYCO3 3RZCO3 3SACO3 3SDCO3 3SECO3 3SFCO3 3SGCO3 3SHCO3 3SJCO3 3SPCO3 3SQCO3 3SRCO3 3SSCO3 3STCO3 3SUCO3 3SXCO3 3SYCO3 3SZCO3 3TACO3 3TBCO3 3TDCO3 3TECO3 3TFCO3 3TJCO3 3TLCO3 3TNCO3 3TPCO3 3TRCO3 3TSCO3 3TTCO3 3TUCO3 3TWCO3 3TXCO3 3TYCO3 3TZCO3 3UACO3 3UBCO3 3UDCO3 3UECO3 3UFCO3 3UJCO3 3ULCO3 3UNCO3 3USCO3 3UZCO3 3WDCO3 3WGCO3 3WLCO3 3XLCO3 3YB

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.