HA1 3 postcode sector in the HA1 district

HA1 3 is a sector of the HA1 district: every postcode that starts HA1 3. It has 263 postcodes in use, 21 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 HA1 3 sector, by flood risk

Map of every postcode in the HA1 3 sector, by flood risk Of the 263 postcodes in the HA1 3 sector that ONS places, 263 are not on the Environment Agency's at-risk list. Places named: Harrow on the Hill, Northwick Park. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A404 HA1 3AA: not on the flood risk listHA1 3AB: not on the flood risk listHA1 3AF: not on the flood risk listHA1 3AG: not on the flood risk listHA1 3AH: not on the flood risk listHA1 3AJ: not on the flood risk listHA1 3AL: not on the flood risk listHA1 3AN: not on the flood risk listHA1 3AP: not on the flood risk listHA1 3AQ: not on the flood risk listHA1 3AR: not on the flood risk listHA1 3AT: not on the flood risk listHA1 3AW: not on the flood risk listHA1 3AX: not on the flood risk listHA1 3AY: not on the flood risk listHA1 3AZ: not on the flood risk listHA1 3BA: not on the flood risk listHA1 3BB: not on the flood risk listHA1 3BD: not on the flood risk listHA1 3BE: not on the flood risk listHA1 3BF: not on the flood risk listHA1 3BG: not on the flood risk listHA1 3BH: not on the flood risk listHA1 3BJ: not on the flood risk listHA1 3BL: not on the flood risk listHA1 3BN: not on the flood risk listHA1 3BQ: not on the flood risk listHA1 3BS: not on the flood risk listHA1 3BT: not on the flood risk listHA1 3BU: not on the flood risk listHA1 3BX: not on the flood risk listHA1 3BY: not on the flood risk listHA1 3BZ: not on the flood risk listHA1 3DA: not on the flood risk listHA1 3DB: not on the flood risk listHA1 3DD: not on the flood risk listHA1 3DE: not on the flood risk listHA1 3DF: not on the flood risk listHA1 3DG: not on the flood risk listHA1 3DH: not on the flood risk listHA1 3DJ: not on the flood risk listHA1 3DL: not on the flood risk listHA1 3DN: not on the flood risk listHA1 3DP: not on the flood risk listHA1 3DQ: not on the flood risk listHA1 3DR: not on the flood risk listHA1 3DS: not on the flood risk listHA1 3DU: not on the flood risk listHA1 3DW: not on the flood risk listHA1 3DX: not on the flood risk listHA1 3DY: not on the flood risk listHA1 3DZ: not on the flood risk listHA1 3EA: not on the flood risk listHA1 3ED: not on the flood risk listHA1 3EF: not on the flood risk listHA1 3EG: not on the flood risk listHA1 3EH: not on the flood risk listHA1 3EJ: not on the flood risk listHA1 3EL: not on the flood risk listHA1 3EN: not on the flood risk listHA1 3EP: not on the flood risk listHA1 3ER: not on the flood risk listHA1 3ES: not on the flood risk listHA1 3ET: not on the flood risk listHA1 3EU: not on the flood risk listHA1 3EW: not on the flood risk listHA1 3EX: not on the flood risk listHA1 3EY: not on the flood risk listHA1 3EZ: not on the flood risk listHA1 3FE: not on the flood risk listHA1 3GE: not on the flood risk listHA1 3GF: not on the flood risk listHA1 3GH: not on the flood risk listHA1 3GJ: not on the flood risk listHA1 3GL: not on the flood risk listHA1 3GN: not on the flood risk listHA1 3GP: not on the flood risk listHA1 3GQ: not on the flood risk listHA1 3GS: not on the flood risk listHA1 3GT: not on the flood risk listHA1 3GW: not on the flood risk listHA1 3GX: not on the flood risk listHA1 3GY: not on the flood risk listHA1 3GZ: not on the flood risk listHA1 3HD: not on the flood risk listHA1 3HE: not on the flood risk listHA1 3HF: not on the flood risk listHA1 3HG: not on the flood risk listHA1 3HJ: not on the flood risk listHA1 3HL: not on the flood risk listHA1 3HN: not on the flood risk listHA1 3HP: not on the flood risk listHA1 3HQ: not on the flood risk listHA1 3HR: not on the flood risk listHA1 3HS: not on the flood risk listHA1 3HT: not on the flood risk listHA1 3HW: not on the flood risk listHA1 3HX: not on the flood risk listHA1 3JA: not on the flood risk listHA1 3JB: not on the flood risk listHA1 3JD: not on the flood risk listHA1 3JE: not on the flood risk listHA1 3JF: not on the flood risk listHA1 3JG: not on the flood risk listHA1 3JH: not on the flood risk listHA1 3JJ: not on the flood risk listHA1 3JL: not on the flood risk listHA1 3JN: not on the flood risk listHA1 3JP: not on the flood risk listHA1 3JQ: not on the flood risk listHA1 3JR: not on the flood risk listHA1 3JS: not on the flood risk listHA1 3JT: not on the flood risk listHA1 3JU: not on the flood risk listHA1 3JW: not on the flood risk listHA1 3JX: not on the flood risk listHA1 3JY: not on the flood risk listHA1 3JZ: not on the flood risk listHA1 3LA: not on the flood risk listHA1 3LB: not on the flood risk listHA1 3LD: not on the flood risk listHA1 3LE: not on the flood risk listHA1 3LF: not on the flood risk listHA1 3LH: not on the flood risk listHA1 3LJ: not on the flood risk listHA1 3LL: not on the flood risk listHA1 3LN: not on the flood risk listHA1 3LP: not on the flood risk listHA1 3LS: not on the flood risk listHA1 3LT: not on the flood risk listHA1 3LU: not on the flood risk listHA1 3LW: not on the flood risk listHA1 3LY: not on the flood risk listHA1 3LZ: not on the flood risk listHA1 3NA: not on the flood risk listHA1 3NB: not on the flood risk listHA1 3ND: not on the flood risk listHA1 3NE: not on the flood risk listHA1 3NF: not on the flood risk listHA1 3NG: not on the flood risk listHA1 3NH: not on the flood risk listHA1 3NJ: not on the flood risk listHA1 3NQ: not on the flood risk listHA1 3NT: not on the flood risk listHA1 3NU: not on the flood risk listHA1 3NW: not on the flood risk listHA1 3NX: not on the flood risk listHA1 3NY: not on the flood risk listHA1 3NZ: not on the flood risk listHA1 3PA: not on the flood risk listHA1 3PB: not on the flood risk listHA1 3PD: not on the flood risk listHA1 3PE: not on the flood risk listHA1 3PF: not on the flood risk listHA1 3PG: not on the flood risk listHA1 3PH: not on the flood risk listHA1 3PJ: not on the flood risk listHA1 3PL: not on the flood risk listHA1 3PN: not on the flood risk listHA1 3PP: not on the flood risk listHA1 3PQ: not on the flood risk listHA1 3PR: not on the flood risk listHA1 3PS: not on the flood risk listHA1 3PT: not on the flood risk listHA1 3PU: not on the flood risk listHA1 3PW: not on the flood risk listHA1 3PX: not on the flood risk listHA1 3PY: not on the flood risk listHA1 3PZ: not on the flood risk listHA1 3QA: not on the flood risk listHA1 3QB: not on the flood risk listHA1 3QD: not on the flood risk listHA1 3QE: not on the flood risk listHA1 3QF: not on the flood risk listHA1 3QG: not on the flood risk listHA1 3QH: not on the flood risk listHA1 3QJ: not on the flood risk listHA1 3QL: not on the flood risk listHA1 3QN: not on the flood risk listHA1 3QP: not on the flood risk listHA1 3QQ: not on the flood risk listHA1 3QS: not on the flood risk listHA1 3QT: not on the flood risk listHA1 3QU: not on the flood risk listHA1 3QX: not on the flood risk listHA1 3QY: not on the flood risk listHA1 3RA: not on the flood risk listHA1 3RD: not on the flood risk listHA1 3RE: not on the flood risk listHA1 3RF: not on the flood risk listHA1 3RG: not on the flood risk listHA1 3RH: not on the flood risk listHA1 3RJ: not on the flood risk listHA1 3RL: not on the flood risk listHA1 3RN: not on the flood risk listHA1 3RQ: not on the flood risk listHA1 3RR: not on the flood risk listHA1 3RS: not on the flood risk listHA1 3RT: not on the flood risk listHA1 3RU: not on the flood risk listHA1 3RW: not on the flood risk listHA1 3RX: not on the flood risk listHA1 3SB: not on the flood risk listHA1 3SD: not on the flood risk listHA1 3SE: not on the flood risk listHA1 3SF: not on the flood risk listHA1 3SG: not on the flood risk listHA1 3SJ: not on the flood risk listHA1 3SN: not on the flood risk listHA1 3SQ: not on the flood risk listHA1 3SS: not on the flood risk listHA1 3ST: not on the flood risk listHA1 3SU: not on the flood risk listHA1 3SW: not on the flood risk listHA1 3SX: not on the flood risk listHA1 3SY: not on the flood risk listHA1 3SZ: not on the flood risk listHA1 3TA: not on the flood risk listHA1 3TB: not on the flood risk listHA1 3TD: not on the flood risk listHA1 3TE: not on the flood risk listHA1 3TF: not on the flood risk listHA1 3TG: not on the flood risk listHA1 3TH: not on the flood risk listHA1 3TL: not on the flood risk listHA1 3TN: not on the flood risk listHA1 3TP: not on the flood risk listHA1 3TS: not on the flood risk listHA1 3TT: not on the flood risk listHA1 3TU: not on the flood risk listHA1 3TX: not on the flood risk listHA1 3TY: not on the flood risk listHA1 3TZ: not on the flood risk listHA1 3UA: not on the flood risk listHA1 3UB: not on the flood risk listHA1 3UD: not on the flood risk listHA1 3UE: not on the flood risk listHA1 3UF: not on the flood risk listHA1 3UG: not on the flood risk listHA1 3UH: not on the flood risk listHA1 3UJ: not on the flood risk listHA1 3UQ: not on the flood risk listHA1 3UX: not on the flood risk listHA1 3WP: not on the flood risk listHA1 3WU: not on the flood risk listHA1 3XD: not on the flood risk listHA1 3XH: not on the flood risk listHA1 3XJ: not on the flood risk listHA1 3YG: not on the flood risk listHA1 3YH: not on the flood risk listHA1 3YJ: not on the flood risk listHA1 3YL: not on the flood risk listHA1 3YP: not on the flood risk listHA1 3YQ: not on the flood risk list Harrow on the HillNorthwick Park Map of every postcode in the HA1 3 sector, by flood risk Of the 263 postcodes in the HA1 3 sector that ONS places, 263 are not on the Environment Agency's at-risk list. Places named: Harrow on the Hill, Northwick Park. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Harrow on the HillNorthwick Park
  • 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: 263

Of the 263 postcodes in the HA1 3 sector that ONS places, 263 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

What do homes sell for in HA1 3?

Homes in HA1 3 sold for a typical £499,950 in the 12 months to August 2026, across 37 sales, up 1.2% on the 12 months before, HM Land Registry's figures show.

£499,950 typical price, the 12 months to August 2026
£494,000 12 months to August 2025
▲ up 1.2% on the 12 months before
  • Detached £1,282,500 8 sales
  • Semi-detached 4 sales, too few to price
  • Terraced 4 sales, too few to price
  • Flat or maisonette £410,000 21 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 HA1 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 HA1 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.

HA1 3AAHA1 3ABHA1 3AFHA1 3AGHA1 3AHHA1 3AJHA1 3ALHA1 3ANHA1 3APHA1 3AQHA1 3ARHA1 3ASHA1 3ATHA1 3AWHA1 3AXHA1 3AYHA1 3AZHA1 3BAHA1 3BBHA1 3BDHA1 3BEHA1 3BFHA1 3BGHA1 3BHHA1 3BJHA1 3BLHA1 3BNHA1 3BQHA1 3BSHA1 3BTHA1 3BUHA1 3BXHA1 3BYHA1 3BZHA1 3DAHA1 3DBHA1 3DDHA1 3DEHA1 3DFHA1 3DGHA1 3DHHA1 3DJHA1 3DLHA1 3DNHA1 3DPHA1 3DQHA1 3DRHA1 3DSHA1 3DUHA1 3DWHA1 3DXHA1 3DYHA1 3DZHA1 3EAHA1 3EDHA1 3EFHA1 3EGHA1 3EHHA1 3EJHA1 3ELHA1 3ENHA1 3EPHA1 3ERHA1 3ESHA1 3ETHA1 3EUHA1 3EWHA1 3EXHA1 3EYHA1 3EZHA1 3FEHA1 3GEHA1 3GFHA1 3GHHA1 3GJHA1 3GLHA1 3GNHA1 3GPHA1 3GQHA1 3GSHA1 3GTHA1 3GWHA1 3GXHA1 3GYHA1 3GZHA1 3HDHA1 3HEHA1 3HFHA1 3HGHA1 3HJHA1 3HLHA1 3HNHA1 3HPHA1 3HQHA1 3HRHA1 3HSHA1 3HTHA1 3HWHA1 3HXHA1 3JAHA1 3JBHA1 3JDHA1 3JEHA1 3JFHA1 3JGHA1 3JHHA1 3JJHA1 3JLHA1 3JNHA1 3JPHA1 3JQHA1 3JRHA1 3JSHA1 3JTHA1 3JUHA1 3JWHA1 3JXHA1 3JYHA1 3JZHA1 3LAHA1 3LBHA1 3LDHA1 3LEHA1 3LFHA1 3LHHA1 3LJHA1 3LLHA1 3LNHA1 3LPHA1 3LSHA1 3LTHA1 3LUHA1 3LWHA1 3LYHA1 3LZHA1 3NAHA1 3NBHA1 3NDHA1 3NEHA1 3NFHA1 3NGHA1 3NHHA1 3NJHA1 3NPHA1 3NQHA1 3NTHA1 3NUHA1 3NWHA1 3NXHA1 3NYHA1 3NZHA1 3PAHA1 3PBHA1 3PDHA1 3PEHA1 3PFHA1 3PGHA1 3PHHA1 3PJHA1 3PLHA1 3PNHA1 3PPHA1 3PQHA1 3PRHA1 3PSHA1 3PTHA1 3PUHA1 3PWHA1 3PXHA1 3PYHA1 3PZHA1 3QAHA1 3QBHA1 3QDHA1 3QEHA1 3QFHA1 3QGHA1 3QHHA1 3QJHA1 3QLHA1 3QNHA1 3QPHA1 3QQHA1 3QSHA1 3QTHA1 3QUHA1 3QXHA1 3QYHA1 3QZHA1 3RAHA1 3RDHA1 3REHA1 3RFHA1 3RGHA1 3RHHA1 3RJHA1 3RLHA1 3RNHA1 3RQHA1 3RRHA1 3RSHA1 3RTHA1 3RUHA1 3RWHA1 3RXHA1 3RYHA1 3SBHA1 3SDHA1 3SEHA1 3SFHA1 3SGHA1 3SHHA1 3SJHA1 3SNHA1 3SQHA1 3SSHA1 3STHA1 3SUHA1 3SWHA1 3SXHA1 3SYHA1 3SZHA1 3TAHA1 3TBHA1 3TDHA1 3TEHA1 3TFHA1 3TGHA1 3THHA1 3TLHA1 3TNHA1 3TPHA1 3TSHA1 3TTHA1 3TUHA1 3TXHA1 3TYHA1 3TZHA1 3UAHA1 3UBHA1 3UDHA1 3UEHA1 3UFHA1 3UGHA1 3UHHA1 3UJHA1 3UQHA1 3UXHA1 3WPHA1 3WSHA1 3WUHA1 3XDHA1 3XHHA1 3XJHA1 3YGHA1 3YHHA1 3YJHA1 3YLHA1 3YPHA1 3YQHA1 3YRHA1 3YUHA1 3YY

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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