CT21 4 postcode sector in the CT21 district

CT21 4 is a sector of the CT21 district: every postcode that starts CT21 4. It has 197 postcodes in use, 5 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 CT21 4 sector, by flood risk

Map of every postcode in the CT21 4 sector, by flood risk Of the 197 postcodes in the CT21 4 sector that ONS places, 6 have a home or business at high risk, 1 are at medium risk at worst, 6 are at low risk at worst, 27 are at very low risk only and 157 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 5 postcodes at high or medium risk. Places named: Hythe, Sellindge. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. M20A20 CT21 4AB: not on the flood risk listCT21 4AD: not on the flood risk listCT21 4AE: not on the flood risk listCT21 4AF: not on the flood risk listCT21 4AG: not on the flood risk listCT21 4AJ: not on the flood risk listCT21 4AL: not on the flood risk listCT21 4AN: not on the flood risk listCT21 4AR: not on the flood risk listCT21 4AS: not on the flood risk listCT21 4AT: not on the flood risk listCT21 4AU: not on the flood risk listCT21 4BB: not on the flood risk listCT21 4BD: not on the flood risk listCT21 4BE: not on the flood risk listCT21 4BG: not on the flood risk listCT21 4BH: not on the flood risk listCT21 4BJ: not on the flood risk listCT21 4BL: not on the flood risk listCT21 4BP: not on the flood risk listCT21 4BS: not on the flood risk listCT21 4BU: not on the flood risk listCT21 4BX: not on the flood risk listCT21 4BY: not on the flood risk listCT21 4DG: not on the flood risk listCT21 4DH: not on the flood risk listCT21 4DJ: not on the flood risk listCT21 4DL: not on the flood risk listCT21 4DN: not on the flood risk listCT21 4DP: not on the flood risk listCT21 4DQ: not on the flood risk listCT21 4DS: not on the flood risk listCT21 4DU: not on the flood risk listCT21 4DW: not on the flood risk listCT21 4EE: not on the flood risk listCT21 4EG: not on the flood risk listCT21 4EH: not on the flood risk listCT21 4EJ: not on the flood risk listCT21 4EL: not on the flood risk listCT21 4EN: not on the flood risk listCT21 4EP: not on the flood risk listCT21 4EQ: not on the flood risk listCT21 4ES: not on the flood risk listCT21 4ET: not on the flood risk listCT21 4EU: not on the flood risk listCT21 4EW: not on the flood risk listCT21 4EX: not on the flood risk listCT21 4EY: not on the flood risk listCT21 4EZ: not on the flood risk listCT21 4FA: not on the flood risk listCT21 4FE: not on the flood risk listCT21 4FJ: not on the flood risk listCT21 4FL: not on the flood risk listCT21 4FN: not on the flood risk listCT21 4FP: not on the flood risk listCT21 4FR: not on the flood risk listCT21 4FS: not on the flood risk listCT21 4FW: not on the flood risk listCT21 4FX: not on the flood risk listCT21 4GP: not on the flood risk listCT21 4HA: not on the flood risk listCT21 4HB: not on the flood risk listCT21 4HD: not on the flood risk listCT21 4HE: not on the flood risk listCT21 4HG: not on the flood risk listCT21 4HJ: not on the flood risk listCT21 4HL: not on the flood risk listCT21 4HN: not on the flood risk listCT21 4HP: not on the flood risk listCT21 4HR: not on the flood risk listCT21 4HS: not on the flood risk listCT21 4HT: not on the flood risk listCT21 4HU: not on the flood risk listCT21 4HX: not on the flood risk listCT21 4HY: not on the flood risk listCT21 4JB: not on the flood risk listCT21 4JD: not on the flood risk listCT21 4JE: not on the flood risk listCT21 4JF: not on the flood risk listCT21 4JG: not on the flood risk listCT21 4JH: not on the flood risk listCT21 4JJ: not on the flood risk listCT21 4JL: not on the flood risk listCT21 4JN: not on the flood risk listCT21 4JP: not on the flood risk listCT21 4JQ: not on the flood risk listCT21 4JR: not on the flood risk listCT21 4JS: not on the flood risk listCT21 4JT: not on the flood risk listCT21 4JU: not on the flood risk listCT21 4JW: not on the flood risk listCT21 4JX: not on the flood risk listCT21 4JY: not on the flood risk listCT21 4JZ: not on the flood risk listCT21 4LA: not on the flood risk listCT21 4LB: not on the flood risk listCT21 4LD: not on the flood risk listCT21 4LE: not on the flood risk listCT21 4LF: not on the flood risk listCT21 4LG: not on the flood risk listCT21 4LJ: not on the flood risk listCT21 4LL: not on the flood risk listCT21 4LN: not on the flood risk listCT21 4LP: not on the flood risk listCT21 4LQ: not on the flood risk listCT21 4LR: not on the flood risk listCT21 4LW: not on the flood risk listCT21 4LX: not on the flood risk listCT21 4LY: not on the flood risk listCT21 4NX: not on the flood risk listCT21 4NY: not on the flood risk listCT21 4PA: not on the flood risk listCT21 4PB: not on the flood risk listCT21 4PD: not on the flood risk listCT21 4PE: not on the flood risk listCT21 4PF: not on the flood risk listCT21 4PH: not on the flood risk listCT21 4PL: not on the flood risk listCT21 4PP: not on the flood risk listCT21 4PQ: not on the flood risk listCT21 4PS: not on the flood risk listCT21 4PT: not on the flood risk listCT21 4PU: not on the flood risk listCT21 4PW: not on the flood risk listCT21 4PX: not on the flood risk listCT21 4QA: not on the flood risk listCT21 4QE: not on the flood risk listCT21 4QG: not on the flood risk listCT21 4QH: not on the flood risk listCT21 4QJ: not on the flood risk listCT21 4QN: not on the flood risk listCT21 4QP: not on the flood risk listCT21 4QU: not on the flood risk listCT21 4QX: not on the flood risk listCT21 4QY: not on the flood risk listCT21 4QZ: not on the flood risk listCT21 4RA: not on the flood risk listCT21 4SE: not on the flood risk listCT21 4SF: not on the flood risk listCT21 4AA: very low flood risk onlyCT21 4AP: very low flood risk onlyCT21 4AW: very low flood risk onlyCT21 4AY: very low flood risk onlyCT21 4AZ: very low flood risk onlyCT21 4BF: very low flood risk onlyCT21 4BN: very low flood risk onlyCT21 4BQ: very low flood risk onlyCT21 4BZ: very low flood risk onlyCT21 4DB: very low flood risk onlyCT21 4NA: very low flood risk onlyCT21 4NB: very low flood risk onlyCT21 4NE: very low flood risk onlyCT21 4NH: very low flood risk onlyCT21 4NJ: very low flood risk onlyCT21 4NN: very low flood risk onlyCT21 4NP: very low flood risk onlyCT21 4NQ: very low flood risk onlyCT21 4NR: very low flood risk onlyCT21 4NS: very low flood risk onlyCT21 4NT: very low flood risk onlyCT21 4NU: very low flood risk onlyCT21 4NW: very low flood risk onlyCT21 4PJ: very low flood risk onlyCT21 4DF: low flood risk at worstCT21 4DZ: low flood risk at worstCT21 4EB: low flood risk at worstCT21 4ND: low flood risk at worstCT21 4NG: low flood risk at worstCT21 4NL: low flood risk at worstCT21 4SG: medium flood risk at worstCT21 4DD: high flood riskCT21 4DE: high flood riskCT21 4DY: high flood riskCT21 4EA: high flood riskCT21 4NF: high flood riskCT21 4QS: high flood risk HytheSellindge 5 postcodes at high or medium risk, outlined: this goes to CT21 4EA, the one with most homes and businesses at high risk5 postcodes at high or medium risk Map of every postcode in the CT21 4 sector, by flood risk Of the 197 postcodes in the CT21 4 sector that ONS places, 6 have a home or business at high risk, 1 are at medium risk at worst, 6 are at low risk at worst, 27 are at very low risk only and 157 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 5 postcodes at high or medium risk. Places named: Hythe, Sellindge. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2 km. A259 HytheSellindge
  • A home or business at high risk: 6
  • At medium risk at worst: 1
  • At low risk at worst: 6
  • At very low risk only: 27
  • Not on the at-risk list: 157
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 197 postcodes in the CT21 4 sector that ONS places, 6 have a home or business at high risk, 1 are at medium risk at worst, 6 are at low risk at worst, 27 are at very low risk only and 157 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 210 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

Beside each: how many of its homes and businesses the Environment Agency puts at that risk.

CT21 4EA9 at high riskCT21 4DY4 at high riskCT21 4NF3 at high riskCT21 4DE3 at high riskCT21 4DD2 at high riskCT21 4QS2 at high risk

Where the postcodes at high or medium risk lie together

  • 5 postcodes at high or medium risk, outlined on the map. CT21 4EA, is the one with most homes and businesses at high risk.

What do homes sell for in CT21 4?

Homes in CT21 4 sold for a typical £460,000 in the 12 months to August 2026, across 73 sales, up 21.1% on the 12 months before, HM Land Registry's figures show.

£460,000 typical price, the 12 months to August 2026
£380,000 12 months to August 2025
▲ up 21.1% on the 12 months before
  • Detached £501,000 42 sales
  • Semi-detached £397,500 17 sales
  • Terraced £270,000 11 sales
  • Flat or maisonette 3 sales, too few to price

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 CT21 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 CT21 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.

CT21 4AACT21 4ABCT21 4ADCT21 4AECT21 4AFCT21 4AGCT21 4AJCT21 4ALCT21 4ANCT21 4APCT21 4ARCT21 4ASCT21 4ATCT21 4AUCT21 4AWCT21 4AXCT21 4AYCT21 4AZCT21 4BBCT21 4BDCT21 4BECT21 4BFCT21 4BGCT21 4BHCT21 4BJCT21 4BLCT21 4BNCT21 4BPCT21 4BQCT21 4BSCT21 4BTCT21 4BUCT21 4BXCT21 4BYCT21 4BZCT21 4DACT21 4DBCT21 4DDCT21 4DECT21 4DFCT21 4DGCT21 4DHCT21 4DJCT21 4DLCT21 4DNCT21 4DPCT21 4DQCT21 4DRCT21 4DSCT21 4DTCT21 4DUCT21 4DWCT21 4DYCT21 4DZCT21 4EACT21 4EBCT21 4EECT21 4EFCT21 4EGCT21 4EHCT21 4EJCT21 4ELCT21 4ENCT21 4EPCT21 4EQCT21 4ESCT21 4ETCT21 4EUCT21 4EWCT21 4EXCT21 4EYCT21 4EZCT21 4FACT21 4FBCT21 4FDCT21 4FECT21 4FFCT21 4FGCT21 4FHCT21 4FJCT21 4FLCT21 4FNCT21 4FPCT21 4FQCT21 4FRCT21 4FSCT21 4FTCT21 4FWCT21 4FXCT21 4FYCT21 4GPCT21 4HACT21 4HBCT21 4HDCT21 4HECT21 4HGCT21 4HJCT21 4HLCT21 4HNCT21 4HPCT21 4HRCT21 4HSCT21 4HTCT21 4HUCT21 4HXCT21 4HYCT21 4JBCT21 4JDCT21 4JECT21 4JFCT21 4JGCT21 4JHCT21 4JJCT21 4JLCT21 4JNCT21 4JPCT21 4JQCT21 4JRCT21 4JSCT21 4JTCT21 4JUCT21 4JWCT21 4JXCT21 4JYCT21 4JZCT21 4LACT21 4LBCT21 4LDCT21 4LECT21 4LFCT21 4LGCT21 4LHCT21 4LJCT21 4LLCT21 4LNCT21 4LPCT21 4LQCT21 4LRCT21 4LWCT21 4LXCT21 4LYCT21 4NACT21 4NBCT21 4NDCT21 4NECT21 4NFCT21 4NGCT21 4NHCT21 4NJCT21 4NLCT21 4NNCT21 4NPCT21 4NQCT21 4NRCT21 4NSCT21 4NTCT21 4NUCT21 4NWCT21 4NXCT21 4NYCT21 4PACT21 4PBCT21 4PDCT21 4PECT21 4PFCT21 4PHCT21 4PJCT21 4PLCT21 4PPCT21 4PQCT21 4PSCT21 4PTCT21 4PUCT21 4PWCT21 4PXCT21 4PYCT21 4PZCT21 4QACT21 4QBCT21 4QECT21 4QGCT21 4QHCT21 4QJCT21 4QNCT21 4QPCT21 4QQCT21 4QSCT21 4QUCT21 4QXCT21 4QYCT21 4QZCT21 4RACT21 4SECT21 4SFCT21 4SGCT21 4WXCT21 4WY

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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