SO21 3 postcode sector in the SO21 district

SO21 3 is a sector of the SO21 district: every postcode that starts SO21 3. It has 243 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 SO21 3 sector, and which are new since 2020

Map of every postcode in the SO21 3 sector, by new since 2020 Of the 243 postcodes in the SO21 3 sector that ONS places, 3 are new since 2020 and 240 were in use before 2020. Places named: Kings Worthy. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A33A30A34A272 SO21 3AA: before 2020SO21 3AB: before 2020SO21 3AD: before 2020SO21 3AE: before 2020SO21 3AF: before 2020SO21 3AG: before 2020SO21 3AH: before 2020SO21 3AJ: before 2020SO21 3AL: before 2020SO21 3AN: before 2020SO21 3AP: before 2020SO21 3AQ: before 2020SO21 3AR: before 2020SO21 3AS: before 2020SO21 3AT: before 2020SO21 3AU: before 2020SO21 3AW: before 2020SO21 3AY: before 2020SO21 3AZ: before 2020SO21 3BA: before 2020SO21 3BB: before 2020SO21 3BD: before 2020SO21 3BE: before 2020SO21 3BF: before 2020SO21 3BG: before 2020SO21 3BH: before 2020SO21 3BJ: before 2020SO21 3BL: before 2020SO21 3BN: before 2020SO21 3BP: before 2020SO21 3BQ: before 2020SO21 3BS: before 2020SO21 3BT: before 2020SO21 3BU: before 2020SO21 3BW: before 2020SO21 3BX: before 2020SO21 3BY: before 2020SO21 3BZ: before 2020SO21 3DA: before 2020SO21 3DB: before 2020SO21 3DD: before 2020SO21 3DE: before 2020SO21 3DF: before 2020SO21 3DG: before 2020SO21 3DJ: before 2020SO21 3DL: before 2020SO21 3DN: before 2020SO21 3DP: before 2020SO21 3DQ: before 2020SO21 3DR: before 2020SO21 3DS: before 2020SO21 3DT: before 2020SO21 3DU: before 2020SO21 3DW: before 2020SO21 3DX: before 2020SO21 3DY: before 2020SO21 3DZ: before 2020SO21 3EA: before 2020SO21 3EB: before 2020SO21 3ED: before 2020SO21 3EE: before 2020SO21 3EG: before 2020SO21 3EH: before 2020SO21 3EJ: before 2020SO21 3EL: before 2020SO21 3EN: before 2020SO21 3EP: before 2020SO21 3EQ: before 2020SO21 3ER: before 2020SO21 3ES: before 2020SO21 3ET: before 2020SO21 3EU: before 2020SO21 3EW: before 2020SO21 3EY: before 2020SO21 3FE: before 2020SO21 3FF: before 2020SO21 3FG: before 2020SO21 3FJ: before 2020SO21 3FL: before 2020SO21 3FN: before 2020SO21 3FP: before 2020SO21 3FQ: before 2020SO21 3FR: before 2020SO21 3FS: before 2020SO21 3FT: before 2020SO21 3FU: before 2020SO21 3FW: before 2020SO21 3GX: before 2020SO21 3GZ: before 2020SO21 3HA: before 2020SO21 3HB: before 2020SO21 3HD: before 2020SO21 3HE: before 2020SO21 3HH: before 2020SO21 3HL: before 2020SO21 3HN: before 2020SO21 3HP: before 2020SO21 3HR: before 2020SO21 3HS: before 2020SO21 3HT: before 2020SO21 3HU: before 2020SO21 3HW: before 2020SO21 3JA: before 2020SO21 3JB: before 2020SO21 3JD: before 2020SO21 3JE: before 2020SO21 3JG: before 2020SO21 3JL: before 2020SO21 3JN: before 2020SO21 3JS: before 2020SO21 3JU: before 2020SO21 3JX: before 2020SO21 3JY: before 2020SO21 3LA: before 2020SO21 3LB: before 2020SO21 3LD: before 2020SO21 3LE: before 2020SO21 3LF: before 2020SO21 3LG: before 2020SO21 3LH: before 2020SO21 3LJ: before 2020SO21 3LL: before 2020SO21 3LN: before 2020SO21 3LP: before 2020SO21 3LQ: before 2020SO21 3LR: before 2020SO21 3LS: before 2020SO21 3LW: before 2020SO21 3LX: before 2020SO21 3NA: before 2020SO21 3NB: before 2020SO21 3ND: before 2020SO21 3NE: before 2020SO21 3NF: before 2020SO21 3NJ: before 2020SO21 3NP: before 2020SO21 3NR: before 2020SO21 3NS: before 2020SO21 3NT: before 2020SO21 3NU: before 2020SO21 3NX: before 2020SO21 3NY: before 2020SO21 3NZ: before 2020SO21 3PA: before 2020SO21 3PB: before 2020SO21 3PD: before 2020SO21 3PE: before 2020SO21 3PF: before 2020SO21 3PG: before 2020SO21 3PH: before 2020SO21 3PL: before 2020SO21 3PN: before 2020SO21 3PR: before 2020SO21 3PS: before 2020SO21 3PT: before 2020SO21 3PW: before 2020SO21 3PX: before 2020SO21 3PY: before 2020SO21 3PZ: before 2020SO21 3QA: before 2020SO21 3QB: before 2020SO21 3QD: before 2020SO21 3QF: before 2020SO21 3QG: before 2020SO21 3QH: before 2020SO21 3QJ: before 2020SO21 3QQ: before 2020SO21 3QR: before 2020SO21 3QS: before 2020SO21 3QX: before 2020SO21 3RA: before 2020SO21 3RB: before 2020SO21 3RD: before 2020SO21 3RE: before 2020SO21 3RG: before 2020SO21 3RH: before 2020SO21 3RJ: before 2020SO21 3RL: before 2020SO21 3RP: before 2020SO21 3RQ: before 2020SO21 3RR: before 2020SO21 3RS: before 2020SO21 3RT: before 2020SO21 3RU: before 2020SO21 3RW: before 2020SO21 3RX: before 2020SO21 3RY: before 2020SO21 3SA: before 2020SO21 3SB: before 2020SO21 3SD: before 2020SO21 3SE: before 2020SO21 3SG: before 2020SO21 3SH: before 2020SO21 3SJ: before 2020SO21 3ST: before 2020SO21 3SU: before 2020SO21 3TA: before 2020SO21 3XA: before 2020SO21 3JP: before 2020SO21 3FX: new since 2020SO21 3FY: new since 2020SO21 3GA: new since 2020 Kings Worthy Map of every postcode in the SO21 3 sector, by new since 2020 Of the 243 postcodes in the SO21 3 sector that ONS places, 3 are new since 2020 and 240 were in use before 2020. Places named: Kings Worthy. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. Kings Worthy
  • New since 2020: 3
  • In use before 2020: 240

Of the 243 postcodes in the SO21 3 sector that ONS places, 3 are new since 2020 and 240 were in use before 2020.

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. New since 2020 means it came into use in January 2020 or later. 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; when each came into use: the same directory; 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 3 newest postcodes

SO21 3FYJuly 2025SO21 3GAAugust 2024SO21 3FXJanuary 2020

What do homes sell for in SO21 3?

Homes in SO21 3 sold for a typical £542,500 in the 12 months to August 2026, across 56 sales, down 7.3% on the 12 months before, HM Land Registry's figures show.

£542,500 typical price, the 12 months to August 2026
£585,000 12 months to August 2025
▼ down 7.3% on the 12 months before
  • Detached £630,000 29 sales
  • Semi-detached £425,000 14 sales
  • Terraced £410,000 10 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 SO21 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 SO21 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.

SO21 3AASO21 3ABSO21 3ADSO21 3AESO21 3AFSO21 3AGSO21 3AHSO21 3AJSO21 3ALSO21 3ANSO21 3APSO21 3AQSO21 3ARSO21 3ASSO21 3ATSO21 3AUSO21 3AWSO21 3AXSO21 3AYSO21 3AZSO21 3BASO21 3BBSO21 3BDSO21 3BESO21 3BFSO21 3BGSO21 3BHSO21 3BJSO21 3BLSO21 3BNSO21 3BPSO21 3BQSO21 3BSSO21 3BTSO21 3BUSO21 3BWSO21 3BXSO21 3BYSO21 3BZSO21 3DASO21 3DBSO21 3DDSO21 3DESO21 3DFSO21 3DGSO21 3DHSO21 3DJSO21 3DLSO21 3DNSO21 3DPSO21 3DQSO21 3DRSO21 3DSSO21 3DTSO21 3DUSO21 3DWSO21 3DXSO21 3DYSO21 3DZSO21 3EASO21 3EBSO21 3EDSO21 3EESO21 3EFSO21 3EGSO21 3EHSO21 3EJSO21 3ELSO21 3ENSO21 3EPSO21 3EQSO21 3ERSO21 3ESSO21 3ETSO21 3EUSO21 3EWSO21 3EXSO21 3EYSO21 3EZSO21 3FASO21 3FBSO21 3FDSO21 3FESO21 3FFSO21 3FGSO21 3FHSO21 3FJSO21 3FLSO21 3FNSO21 3FPSO21 3FQSO21 3FRSO21 3FSSO21 3FTSO21 3FUSO21 3FWSO21 3FXSO21 3FYSO21 3GASO21 3GXSO21 3GYSO21 3GZSO21 3HASO21 3HBSO21 3HDSO21 3HESO21 3HFSO21 3HGSO21 3HHSO21 3HJSO21 3HLSO21 3HNSO21 3HPSO21 3HQSO21 3HRSO21 3HSSO21 3HTSO21 3HUSO21 3HWSO21 3HXSO21 3HYSO21 3HZSO21 3JASO21 3JBSO21 3JDSO21 3JESO21 3JFSO21 3JGSO21 3JHSO21 3JJSO21 3JLSO21 3JNSO21 3JPSO21 3JRSO21 3JSSO21 3JTSO21 3JUSO21 3JWSO21 3JXSO21 3JYSO21 3LASO21 3LBSO21 3LDSO21 3LESO21 3LFSO21 3LGSO21 3LHSO21 3LJSO21 3LLSO21 3LNSO21 3LPSO21 3LQSO21 3LRSO21 3LSSO21 3LTSO21 3LUSO21 3LWSO21 3LXSO21 3NASO21 3NBSO21 3NDSO21 3NESO21 3NFSO21 3NHSO21 3NJSO21 3NLSO21 3NPSO21 3NRSO21 3NSSO21 3NTSO21 3NUSO21 3NXSO21 3NYSO21 3NZSO21 3PASO21 3PBSO21 3PDSO21 3PESO21 3PFSO21 3PGSO21 3PHSO21 3PJSO21 3PLSO21 3PNSO21 3PPSO21 3PQSO21 3PRSO21 3PSSO21 3PTSO21 3PWSO21 3PXSO21 3PYSO21 3PZSO21 3QASO21 3QBSO21 3QDSO21 3QFSO21 3QGSO21 3QHSO21 3QJSO21 3QQSO21 3QRSO21 3QSSO21 3QXSO21 3QYSO21 3QZSO21 3RASO21 3RBSO21 3RDSO21 3RESO21 3RFSO21 3RGSO21 3RHSO21 3RJSO21 3RLSO21 3RNSO21 3RPSO21 3RQSO21 3RRSO21 3RSSO21 3RTSO21 3RUSO21 3RWSO21 3RXSO21 3RYSO21 3RZSO21 3SASO21 3SBSO21 3SDSO21 3SESO21 3SFSO21 3SGSO21 3SHSO21 3SJSO21 3SLSO21 3SNSO21 3SPSO21 3SRSO21 3STSO21 3SUSO21 3TASO21 3XASO21 3XX

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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