GU21 3 postcode sector in the GU21 district

GU21 3 is a sector of the GU21 district: every postcode that starts GU21 3. It has 165 postcodes in use, 2 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 GU21 3 sector, by flood risk

Map of every postcode in the GU21 3 sector, by flood risk Of the 165 postcodes in the GU21 3 sector that ONS places, 165 are not on the Environment Agency's at-risk list. One postcode lies beyond the edge and is listed under the map. Places named: Goldsworth Park, St John's. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. GU21 3AA: not on the flood risk listGU21 3AB: not on the flood risk listGU21 3AD: not on the flood risk listGU21 3AE: not on the flood risk listGU21 3AF: not on the flood risk listGU21 3AG: not on the flood risk listGU21 3AH: not on the flood risk listGU21 3AJ: not on the flood risk listGU21 3AL: not on the flood risk listGU21 3AN: not on the flood risk listGU21 3AP: not on the flood risk listGU21 3AQ: not on the flood risk listGU21 3AR: not on the flood risk listGU21 3AS: not on the flood risk listGU21 3AT: not on the flood risk listGU21 3AU: not on the flood risk listGU21 3AW: not on the flood risk listGU21 3AX: not on the flood risk listGU21 3BA: not on the flood risk listGU21 3BE: not on the flood risk listGU21 3BG: not on the flood risk listGU21 3BH: not on the flood risk listGU21 3BN: not on the flood risk listGU21 3BP: not on the flood risk listGU21 3BQ: not on the flood risk listGU21 3BS: not on the flood risk listGU21 3BT: not on the flood risk listGU21 3BU: not on the flood risk listGU21 3BW: not on the flood risk listGU21 3BX: not on the flood risk listGU21 3BY: not on the flood risk listGU21 3BZ: not on the flood risk listGU21 3DA: not on the flood risk listGU21 3DB: not on the flood risk listGU21 3DD: not on the flood risk listGU21 3DE: not on the flood risk listGU21 3DJ: not on the flood risk listGU21 3DL: not on the flood risk listGU21 3DN: not on the flood risk listGU21 3DS: not on the flood risk listGU21 3DT: not on the flood risk listGU21 3DU: not on the flood risk listGU21 3DW: not on the flood risk listGU21 3DX: not on the flood risk listGU21 3DY: not on the flood risk listGU21 3DZ: not on the flood risk listGU21 3HA: not on the flood risk listGU21 3HB: not on the flood risk listGU21 3HD: not on the flood risk listGU21 3HE: not on the flood risk listGU21 3HF: not on the flood risk listGU21 3HG: not on the flood risk listGU21 3HH: not on the flood risk listGU21 3HJ: not on the flood risk listGU21 3HL: not on the flood risk listGU21 3HN: not on the flood risk listGU21 3HP: not on the flood risk listGU21 3HQ: not on the flood risk listGU21 3HS: not on the flood risk listGU21 3HT: not on the flood risk listGU21 3HU: not on the flood risk listGU21 3HW: not on the flood risk listGU21 3HX: not on the flood risk listGU21 3HY: not on the flood risk listGU21 3HZ: not on the flood risk listGU21 3JA: not on the flood risk listGU21 3JB: not on the flood risk listGU21 3JD: not on the flood risk listGU21 3JE: not on the flood risk listGU21 3JF: not on the flood risk listGU21 3JN: not on the flood risk listGU21 3JP: not on the flood risk listGU21 3JR: not on the flood risk listGU21 3JT: not on the flood risk listGU21 3JU: not on the flood risk listGU21 3JW: not on the flood risk listGU21 3JX: not on the flood risk listGU21 3JY: not on the flood risk listGU21 3JZ: not on the flood risk listGU21 3LA: not on the flood risk listGU21 3LB: not on the flood risk listGU21 3LD: not on the flood risk listGU21 3LE: not on the flood risk listGU21 3LG: not on the flood risk listGU21 3LH: not on the flood risk listGU21 3LJ: not on the flood risk listGU21 3LL: not on the flood risk listGU21 3LN: not on the flood risk listGU21 3LP: not on the flood risk listGU21 3LQ: not on the flood risk listGU21 3LR: not on the flood risk listGU21 3LS: not on the flood risk listGU21 3LT: not on the flood risk listGU21 3LW: not on the flood risk listGU21 3LX: not on the flood risk listGU21 3LY: not on the flood risk listGU21 3LZ: not on the flood risk listGU21 3NL: not on the flood risk listGU21 3NP: not on the flood risk listGU21 3NR: not on the flood risk listGU21 3NT: not on the flood risk listGU21 3NU: not on the flood risk listGU21 3NX: not on the flood risk listGU21 3NY: not on the flood risk listGU21 3NZ: not on the flood risk listGU21 3PA: not on the flood risk listGU21 3PB: not on the flood risk listGU21 3PD: not on the flood risk listGU21 3PE: not on the flood risk listGU21 3PF: not on the flood risk listGU21 3PG: not on the flood risk listGU21 3PH: not on the flood risk listGU21 3PJ: not on the flood risk listGU21 3PL: not on the flood risk listGU21 3PN: not on the flood risk listGU21 3PP: not on the flood risk listGU21 3PQ: not on the flood risk listGU21 3PR: not on the flood risk listGU21 3PS: not on the flood risk listGU21 3PT: not on the flood risk listGU21 3PU: not on the flood risk listGU21 3PW: not on the flood risk listGU21 3PX: not on the flood risk listGU21 3PY: not on the flood risk listGU21 3PZ: not on the flood risk listGU21 3QA: not on the flood risk listGU21 3QB: not on the flood risk listGU21 3QD: not on the flood risk listGU21 3QF: not on the flood risk listGU21 3QG: not on the flood risk listGU21 3QH: not on the flood risk listGU21 3QJ: not on the flood risk listGU21 3QL: not on the flood risk listGU21 3QN: not on the flood risk listGU21 3QP: not on the flood risk listGU21 3QQ: not on the flood risk listGU21 3QR: not on the flood risk listGU21 3QS: not on the flood risk listGU21 3QT: not on the flood risk listGU21 3QU: not on the flood risk listGU21 3QW: not on the flood risk listGU21 3QX: not on the flood risk listGU21 3QY: not on the flood risk listGU21 3QZ: not on the flood risk listGU21 3RA: not on the flood risk listGU21 3RB: not on the flood risk listGU21 3RD: not on the flood risk listGU21 3RE: not on the flood risk listGU21 3RF: not on the flood risk listGU21 3RG: not on the flood risk listGU21 3RH: not on the flood risk listGU21 3RJ: not on the flood risk listGU21 3RL: not on the flood risk listGU21 3RN: not on the flood risk listGU21 3RP: not on the flood risk listGU21 3RQ: not on the flood risk listGU21 3RR: not on the flood risk listGU21 3RS: not on the flood risk listGU21 3RT: not on the flood risk listGU21 3RU: not on the flood risk listGU21 3RW: not on the flood risk listGU21 3RX: not on the flood risk listGU21 3TA: not on the flood risk listGU21 3TB: not on the flood risk list Goldsworth ParkSt John's Map of every postcode in the GU21 3 sector, by flood risk Of the 165 postcodes in the GU21 3 sector that ONS places, 165 are not on the Environment Agency's at-risk list. One postcode lies beyond the edge and is listed under the map. Places named: Goldsworth Park, St John's. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Goldsworth ParkSt John's
  • A home or business at high risk: 0
  • At medium risk at worst: 0
  • At low risk at worst: 0
  • At very low risk only: 0
  • Not on the at-risk list: 165

Of the 165 postcodes in the GU21 3 sector that ONS places, 165 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

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.

GU21 3XG

What do homes sell for in GU21 3?

Homes in GU21 3 sold for a typical £370,000 in the 12 months to August 2026, across 123 sales, up 4.2% on the 12 months before, HM Land Registry's figures show.

£370,000 typical price, the 12 months to August 2026
£355,000 12 months to August 2025
▲ up 4.2% on the 12 months before
  • Detached £564,500 20 sales
  • Semi-detached £392,500 22 sales
  • Terraced £360,000 64 sales
  • Flat or maisonette £226,000 17 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 GU21 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 GU21 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.

GU21 3AAGU21 3ABGU21 3ADGU21 3AEGU21 3AFGU21 3AGGU21 3AHGU21 3AJGU21 3ALGU21 3ANGU21 3APGU21 3AQGU21 3ARGU21 3ASGU21 3ATGU21 3AUGU21 3AWGU21 3AXGU21 3BAGU21 3BEGU21 3BGGU21 3BHGU21 3BNGU21 3BPGU21 3BQGU21 3BSGU21 3BTGU21 3BUGU21 3BWGU21 3BXGU21 3BYGU21 3BZGU21 3DAGU21 3DBGU21 3DDGU21 3DEGU21 3DJGU21 3DLGU21 3DNGU21 3DSGU21 3DTGU21 3DUGU21 3DWGU21 3DXGU21 3DYGU21 3DZGU21 3HAGU21 3HBGU21 3HDGU21 3HEGU21 3HFGU21 3HGGU21 3HHGU21 3HJGU21 3HLGU21 3HNGU21 3HPGU21 3HQGU21 3HSGU21 3HTGU21 3HUGU21 3HWGU21 3HXGU21 3HYGU21 3HZGU21 3JAGU21 3JBGU21 3JDGU21 3JEGU21 3JFGU21 3JNGU21 3JPGU21 3JRGU21 3JTGU21 3JUGU21 3JWGU21 3JXGU21 3JYGU21 3JZGU21 3LAGU21 3LBGU21 3LDGU21 3LEGU21 3LGGU21 3LHGU21 3LJGU21 3LLGU21 3LNGU21 3LPGU21 3LQGU21 3LRGU21 3LSGU21 3LTGU21 3LWGU21 3LXGU21 3LYGU21 3LZGU21 3NLGU21 3NPGU21 3NRGU21 3NTGU21 3NUGU21 3NXGU21 3NYGU21 3NZGU21 3PAGU21 3PBGU21 3PDGU21 3PEGU21 3PFGU21 3PGGU21 3PHGU21 3PJGU21 3PLGU21 3PNGU21 3PPGU21 3PQGU21 3PRGU21 3PSGU21 3PTGU21 3PUGU21 3PWGU21 3PXGU21 3PYGU21 3PZGU21 3QAGU21 3QBGU21 3QDGU21 3QFGU21 3QGGU21 3QHGU21 3QJGU21 3QLGU21 3QNGU21 3QPGU21 3QQGU21 3QRGU21 3QSGU21 3QTGU21 3QUGU21 3QWGU21 3QXGU21 3QYGU21 3QZGU21 3RAGU21 3RBGU21 3RDGU21 3REGU21 3RFGU21 3RGGU21 3RHGU21 3RJGU21 3RLGU21 3RNGU21 3RPGU21 3RQGU21 3RRGU21 3RSGU21 3RTGU21 3RUGU21 3RWGU21 3RXGU21 3TAGU21 3TBGU21 3XG

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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