BN21 3 postcode sector in the BN21 district

BN21 3 is a sector of the BN21 district: every postcode that starts BN21 3. It has 212 postcodes in use, 19 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 BN21 3 sector, by flood risk

Map of every postcode in the BN21 3 sector, by flood risk Of the 212 postcodes in the BN21 3 sector that ONS places, 3 have a home or business at high risk, 5 are at very low risk only and 204 are not on the Environment Agency's at-risk list. Places named: Devonshire, Upperton. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. BN21 3AB: not on the flood risk listBN21 3AE: not on the flood risk listBN21 3AG: not on the flood risk listBN21 3AH: not on the flood risk listBN21 3AJ: not on the flood risk listBN21 3AL: not on the flood risk listBN21 3AN: not on the flood risk listBN21 3AQ: not on the flood risk listBN21 3AR: not on the flood risk listBN21 3AT: not on the flood risk listBN21 3AW: not on the flood risk listBN21 3AX: not on the flood risk listBN21 3AY: not on the flood risk listBN21 3AZ: not on the flood risk listBN21 3BA: not on the flood risk listBN21 3BB: not on the flood risk listBN21 3BE: not on the flood risk listBN21 3BF: not on the flood risk listBN21 3BH: not on the flood risk listBN21 3BJ: not on the flood risk listBN21 3BL: not on the flood risk listBN21 3BN: not on the flood risk listBN21 3BP: not on the flood risk listBN21 3BS: not on the flood risk listBN21 3BT: not on the flood risk listBN21 3BX: not on the flood risk listBN21 3BZ: not on the flood risk listBN21 3DA: not on the flood risk listBN21 3DB: not on the flood risk listBN21 3DD: not on the flood risk listBN21 3DE: not on the flood risk listBN21 3DF: not on the flood risk listBN21 3DH: not on the flood risk listBN21 3DJ: not on the flood risk listBN21 3DL: not on the flood risk listBN21 3DN: not on the flood risk listBN21 3DU: not on the flood risk listBN21 3ED: not on the flood risk listBN21 3EE: not on the flood risk listBN21 3EF: not on the flood risk listBN21 3EG: not on the flood risk listBN21 3EH: not on the flood risk listBN21 3EJ: not on the flood risk listBN21 3EP: not on the flood risk listBN21 3EQ: not on the flood risk listBN21 3ER: not on the flood risk listBN21 3ES: not on the flood risk listBN21 3EU: not on the flood risk listBN21 3EX: not on the flood risk listBN21 3FA: not on the flood risk listBN21 3FD: not on the flood risk listBN21 3FE: not on the flood risk listBN21 3FF: not on the flood risk listBN21 3FG: not on the flood risk listBN21 3FH: not on the flood risk listBN21 3FJ: not on the flood risk listBN21 3FL: not on the flood risk listBN21 3FN: not on the flood risk listBN21 3FP: not on the flood risk listBN21 3GA: not on the flood risk listBN21 3HA: not on the flood risk listBN21 3HD: not on the flood risk listBN21 3HG: not on the flood risk listBN21 3HH: not on the flood risk listBN21 3HJ: not on the flood risk listBN21 3HP: not on the flood risk listBN21 3HQ: not on the flood risk listBN21 3HR: not on the flood risk listBN21 3HS: not on the flood risk listBN21 3HT: not on the flood risk listBN21 3HU: not on the flood risk listBN21 3HX: not on the flood risk listBN21 3HY: not on the flood risk listBN21 3JA: not on the flood risk listBN21 3JB: not on the flood risk listBN21 3JE: not on the flood risk listBN21 3JF: not on the flood risk listBN21 3JG: not on the flood risk listBN21 3JL: not on the flood risk listBN21 3JP: not on the flood risk listBN21 3JT: not on the flood risk listBN21 3JU: not on the flood risk listBN21 3JX: not on the flood risk listBN21 3LA: not on the flood risk listBN21 3LD: not on the flood risk listBN21 3LE: not on the flood risk listBN21 3LF: not on the flood risk listBN21 3LG: not on the flood risk listBN21 3LH: not on the flood risk listBN21 3LP: not on the flood risk listBN21 3LX: not on the flood risk listBN21 3LY: not on the flood risk listBN21 3LZ: not on the flood risk listBN21 3ND: not on the flood risk listBN21 3NE: not on the flood risk listBN21 3NJ: not on the flood risk listBN21 3NL: not on the flood risk listBN21 3NR: not on the flood risk listBN21 3NU: not on the flood risk listBN21 3NW: not on the flood risk listBN21 3NX: not on the flood risk listBN21 3PA: not on the flood risk listBN21 3PB: not on the flood risk listBN21 3PD: not on the flood risk listBN21 3PE: not on the flood risk listBN21 3PF: not on the flood risk listBN21 3PH: not on the flood risk listBN21 3PL: not on the flood risk listBN21 3PN: not on the flood risk listBN21 3PP: not on the flood risk listBN21 3PR: not on the flood risk listBN21 3PS: not on the flood risk listBN21 3PT: not on the flood risk listBN21 3PZ: not on the flood risk listBN21 3QA: not on the flood risk listBN21 3QD: not on the flood risk listBN21 3QE: not on the flood risk listBN21 3QG: not on the flood risk listBN21 3QJ: not on the flood risk listBN21 3QL: not on the flood risk listBN21 3QP: not on the flood risk listBN21 3QR: not on the flood risk listBN21 3QS: not on the flood risk listBN21 3QY: not on the flood risk listBN21 3RB: not on the flood risk listBN21 3RF: not on the flood risk listBN21 3RG: not on the flood risk listBN21 3RH: not on the flood risk listBN21 3RJ: not on the flood risk listBN21 3RL: not on the flood risk listBN21 3RN: not on the flood risk listBN21 3RR: not on the flood risk listBN21 3RT: not on the flood risk listBN21 3RX: not on the flood risk listBN21 3RY: not on the flood risk listBN21 3SA: not on the flood risk listBN21 3SB: not on the flood risk listBN21 3SD: not on the flood risk listBN21 3SE: not on the flood risk listBN21 3SF: not on the flood risk listBN21 3SG: not on the flood risk listBN21 3SH: not on the flood risk listBN21 3SJ: not on the flood risk listBN21 3SL: not on the flood risk listBN21 3SN: not on the flood risk listBN21 3SP: not on the flood risk listBN21 3TB: not on the flood risk listBN21 3TE: not on the flood risk listBN21 3TG: not on the flood risk listBN21 3TH: not on the flood risk listBN21 3TJ: not on the flood risk listBN21 3TN: not on the flood risk listBN21 3TP: not on the flood risk listBN21 3TR: not on the flood risk listBN21 3TT: not on the flood risk listBN21 3TU: not on the flood risk listBN21 3TX: not on the flood risk listBN21 3TY: not on the flood risk listBN21 3TZ: not on the flood risk listBN21 3UA: not on the flood risk listBN21 3UE: not on the flood risk listBN21 3UF: not on the flood risk listBN21 3UG: not on the flood risk listBN21 3UH: not on the flood risk listBN21 3UL: not on the flood risk listBN21 3UN: not on the flood risk listBN21 3UP: not on the flood risk listBN21 3UT: not on the flood risk listBN21 3UU: not on the flood risk listBN21 3UW: not on the flood risk listBN21 3UX: not on the flood risk listBN21 3UY: not on the flood risk listBN21 3WW: not on the flood risk listBN21 3XA: not on the flood risk listBN21 3XB: not on the flood risk listBN21 3XE: not on the flood risk listBN21 3XF: not on the flood risk listBN21 3XG: not on the flood risk listBN21 3XH: not on the flood risk listBN21 3XJ: not on the flood risk listBN21 3XL: not on the flood risk listBN21 3XN: not on the flood risk listBN21 3XP: not on the flood risk listBN21 3XQ: not on the flood risk listBN21 3XR: not on the flood risk listBN21 3XS: not on the flood risk listBN21 3XW: not on the flood risk listBN21 3XY: not on the flood risk listBN21 3XZ: not on the flood risk listBN21 3YA: not on the flood risk listBN21 3YB: not on the flood risk listBN21 3YD: not on the flood risk listBN21 3YE: not on the flood risk listBN21 3YN: not on the flood risk listBN21 3YP: not on the flood risk listBN21 3YQ: not on the flood risk listBN21 3YR: not on the flood risk listBN21 3YT: not on the flood risk listBN21 3ZE: not on the flood risk listBN21 3AD: very low flood risk onlyBN21 3DW: very low flood risk onlyBN21 3ET: very low flood risk onlyBN21 3EY: very low flood risk onlyBN21 3PG: very low flood risk onlyBN21 3DX: high flood riskBN21 3DY: high flood riskBN21 3EL: high flood risk DevonshireUpperton Map of every postcode in the BN21 3 sector, by flood risk Of the 212 postcodes in the BN21 3 sector that ONS places, 3 have a home or business at high risk, 5 are at very low risk only and 204 are not on the Environment Agency's at-risk list. Places named: Devonshire, Upperton. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. DevonshireUpperton
  • A home or business at high risk: 3
  • At medium risk at worst: 0
  • At low risk at worst: 0
  • At very low risk only: 5
  • Not on the at-risk list: 204

Of the 212 postcodes in the BN21 3 sector that ONS places, 3 have a home or business at high risk, 5 are at very low risk only and 204 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. Names in italics are council wards: we hold no town or village names here.

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.

BN21 3DX18 at high riskBN21 3EL5 at high riskBN21 3DY3 at high risk

What do homes sell for in BN21 3?

Homes in BN21 3 sold for a typical £150,000 in the 12 months to August 2026, across 75 sales, down 9.3% on the 12 months before, HM Land Registry's figures show.

£150,000 typical price, the 12 months to August 2026
£165,375 12 months to August 2025
▼ down 9.3% on the 12 months before
  • Detached 1 sale, too few to price
  • Semi-detached 1 sale, too few to price
  • Terraced £250,000 13 sales
  • Flat or maisonette £135,000 60 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 BN21 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 BN21 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.

BN21 3ABBN21 3ADBN21 3AEBN21 3AGBN21 3AHBN21 3AJBN21 3ALBN21 3ANBN21 3AQBN21 3ARBN21 3ATBN21 3AWBN21 3AXBN21 3AYBN21 3AZBN21 3BABN21 3BBBN21 3BEBN21 3BFBN21 3BHBN21 3BJBN21 3BLBN21 3BNBN21 3BPBN21 3BSBN21 3BTBN21 3BWBN21 3BXBN21 3BZBN21 3DABN21 3DBBN21 3DDBN21 3DEBN21 3DFBN21 3DHBN21 3DJBN21 3DLBN21 3DNBN21 3DUBN21 3DWBN21 3DXBN21 3DYBN21 3EDBN21 3EEBN21 3EFBN21 3EGBN21 3EHBN21 3EJBN21 3ELBN21 3EPBN21 3EQBN21 3ERBN21 3ESBN21 3ETBN21 3EUBN21 3EXBN21 3EYBN21 3FABN21 3FDBN21 3FEBN21 3FFBN21 3FGBN21 3FHBN21 3FJBN21 3FLBN21 3FNBN21 3FPBN21 3GABN21 3HABN21 3HDBN21 3HGBN21 3HHBN21 3HJBN21 3HPBN21 3HQBN21 3HRBN21 3HSBN21 3HTBN21 3HUBN21 3HXBN21 3HYBN21 3HZBN21 3JABN21 3JBBN21 3JEBN21 3JFBN21 3JGBN21 3JLBN21 3JPBN21 3JTBN21 3JUBN21 3JXBN21 3LABN21 3LDBN21 3LEBN21 3LFBN21 3LGBN21 3LHBN21 3LPBN21 3LXBN21 3LYBN21 3LZBN21 3NDBN21 3NEBN21 3NJBN21 3NLBN21 3NRBN21 3NUBN21 3NWBN21 3NXBN21 3PABN21 3PBBN21 3PDBN21 3PEBN21 3PFBN21 3PGBN21 3PHBN21 3PJBN21 3PLBN21 3PNBN21 3PPBN21 3PRBN21 3PSBN21 3PTBN21 3PZBN21 3QABN21 3QDBN21 3QEBN21 3QGBN21 3QJBN21 3QLBN21 3QPBN21 3QRBN21 3QSBN21 3QYBN21 3RBBN21 3RFBN21 3RGBN21 3RHBN21 3RJBN21 3RLBN21 3RNBN21 3RRBN21 3RTBN21 3RXBN21 3RYBN21 3SABN21 3SBBN21 3SDBN21 3SEBN21 3SFBN21 3SGBN21 3SHBN21 3SJBN21 3SLBN21 3SNBN21 3SPBN21 3TBBN21 3TEBN21 3TGBN21 3THBN21 3TJBN21 3TNBN21 3TPBN21 3TRBN21 3TTBN21 3TUBN21 3TXBN21 3TYBN21 3TZBN21 3UABN21 3UEBN21 3UFBN21 3UGBN21 3UHBN21 3ULBN21 3UNBN21 3UPBN21 3UTBN21 3UUBN21 3UWBN21 3UXBN21 3UYBN21 3WGBN21 3WWBN21 3XABN21 3XBBN21 3XEBN21 3XFBN21 3XGBN21 3XHBN21 3XJBN21 3XLBN21 3XNBN21 3XPBN21 3XQBN21 3XRBN21 3XSBN21 3XWBN21 3XXBN21 3XYBN21 3XZBN21 3YABN21 3YBBN21 3YDBN21 3YEBN21 3YNBN21 3YPBN21 3YQBN21 3YRBN21 3YTBN21 3ZE

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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