HA1 4 postcode sector in the HA1 district

HA1 4 is a sector of the HA1 district: every postcode that starts HA1 4. It has 291 postcodes in use, 7 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 4 sector, by flood risk

Map of every postcode in the HA1 4 sector, by flood risk Of the 291 postcodes in the HA1 4 sector that ONS places, 3 have a home or business at high risk, 1 are at low risk at worst and 287 are not on the Environment Agency's at-risk list. Places named: Harrow. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A404 HA1 4AA: not on the flood risk listHA1 4AB: not on the flood risk listHA1 4AD: not on the flood risk listHA1 4AE: not on the flood risk listHA1 4AF: not on the flood risk listHA1 4AG: not on the flood risk listHA1 4AH: not on the flood risk listHA1 4AJ: not on the flood risk listHA1 4AL: not on the flood risk listHA1 4AN: not on the flood risk listHA1 4AP: not on the flood risk listHA1 4AQ: not on the flood risk listHA1 4AR: not on the flood risk listHA1 4AS: not on the flood risk listHA1 4AW: not on the flood risk listHA1 4AX: not on the flood risk listHA1 4AY: not on the flood risk listHA1 4AZ: not on the flood risk listHA1 4BD: not on the flood risk listHA1 4BE: not on the flood risk listHA1 4BF: not on the flood risk listHA1 4BG: not on the flood risk listHA1 4BH: not on the flood risk listHA1 4BJ: not on the flood risk listHA1 4BL: not on the flood risk listHA1 4BN: not on the flood risk listHA1 4BP: not on the flood risk listHA1 4BQ: not on the flood risk listHA1 4BS: not on the flood risk listHA1 4BT: not on the flood risk listHA1 4BU: not on the flood risk listHA1 4BW: not on the flood risk listHA1 4BX: not on the flood risk listHA1 4BY: not on the flood risk listHA1 4BZ: not on the flood risk listHA1 4DA: not on the flood risk listHA1 4DB: not on the flood risk listHA1 4DD: not on the flood risk listHA1 4DE: not on the flood risk listHA1 4DF: not on the flood risk listHA1 4DG: not on the flood risk listHA1 4DH: not on the flood risk listHA1 4DJ: not on the flood risk listHA1 4DL: not on the flood risk listHA1 4DN: not on the flood risk listHA1 4DP: not on the flood risk listHA1 4DQ: not on the flood risk listHA1 4DR: not on the flood risk listHA1 4DS: not on the flood risk listHA1 4DT: not on the flood risk listHA1 4DU: not on the flood risk listHA1 4DX: not on the flood risk listHA1 4DY: not on the flood risk listHA1 4DZ: not on the flood risk listHA1 4EA: not on the flood risk listHA1 4EB: not on the flood risk listHA1 4ED: not on the flood risk listHA1 4EE: not on the flood risk listHA1 4EF: not on the flood risk listHA1 4EG: not on the flood risk listHA1 4EH: not on the flood risk listHA1 4EJ: not on the flood risk listHA1 4EL: not on the flood risk listHA1 4EN: not on the flood risk listHA1 4EP: not on the flood risk listHA1 4EQ: not on the flood risk listHA1 4ER: not on the flood risk listHA1 4ES: not on the flood risk listHA1 4ET: not on the flood risk listHA1 4EU: not on the flood risk listHA1 4EW: not on the flood risk listHA1 4EX: not on the flood risk listHA1 4EY: not on the flood risk listHA1 4EZ: not on the flood risk listHA1 4FL: not on the flood risk listHA1 4FN: not on the flood risk listHA1 4FP: not on the flood risk listHA1 4FR: not on the flood risk listHA1 4FT: not on the flood risk listHA1 4FU: not on the flood risk listHA1 4FX: not on the flood risk listHA1 4FY: not on the flood risk listHA1 4FZ: not on the flood risk listHA1 4GA: not on the flood risk listHA1 4GB: not on the flood risk listHA1 4GD: not on the flood risk listHA1 4GE: not on the flood risk listHA1 4GF: not on the flood risk listHA1 4GG: not on the flood risk listHA1 4GH: not on the flood risk listHA1 4GJ: not on the flood risk listHA1 4GL: not on the flood risk listHA1 4GN: not on the flood risk listHA1 4GP: not on the flood risk listHA1 4GQ: not on the flood risk listHA1 4GR: not on the flood risk listHA1 4GS: not on the flood risk listHA1 4GT: not on the flood risk listHA1 4GU: not on the flood risk listHA1 4GW: not on the flood risk listHA1 4GX: not on the flood risk listHA1 4GY: not on the flood risk listHA1 4GZ: not on the flood risk listHA1 4HA: not on the flood risk listHA1 4HD: not on the flood risk listHA1 4HE: not on the flood risk listHA1 4HF: not on the flood risk listHA1 4HJ: not on the flood risk listHA1 4HL: not on the flood risk listHA1 4HN: not on the flood risk listHA1 4HT: not on the flood risk listHA1 4HU: not on the flood risk listHA1 4HX: not on the flood risk listHA1 4HY: not on the flood risk listHA1 4HZ: not on the flood risk listHA1 4JA: not on the flood risk listHA1 4JD: not on the flood risk listHA1 4JE: not on the flood risk listHA1 4JF: not on the flood risk listHA1 4JG: not on the flood risk listHA1 4JH: not on the flood risk listHA1 4JJ: not on the flood risk listHA1 4JN: not on the flood risk listHA1 4JP: not on the flood risk listHA1 4JQ: not on the flood risk listHA1 4JS: not on the flood risk listHA1 4JT: not on the flood risk listHA1 4JU: not on the flood risk listHA1 4JW: not on the flood risk listHA1 4JX: not on the flood risk listHA1 4JY: not on the flood risk listHA1 4JZ: not on the flood risk listHA1 4LA: not on the flood risk listHA1 4LB: not on the flood risk listHA1 4LF: not on the flood risk listHA1 4LN: not on the flood risk listHA1 4LP: not on the flood risk listHA1 4LR: not on the flood risk listHA1 4LS: not on the flood risk listHA1 4LT: not on the flood risk listHA1 4LU: not on the flood risk listHA1 4LX: not on the flood risk listHA1 4LY: not on the flood risk listHA1 4LZ: not on the flood risk listHA1 4NA: not on the flood risk listHA1 4NB: not on the flood risk listHA1 4ND: not on the flood risk listHA1 4NE: not on the flood risk listHA1 4NF: not on the flood risk listHA1 4NG: not on the flood risk listHA1 4NH: not on the flood risk listHA1 4NJ: not on the flood risk listHA1 4NL: not on the flood risk listHA1 4NN: not on the flood risk listHA1 4NQ: not on the flood risk listHA1 4PA: not on the flood risk listHA1 4PB: not on the flood risk listHA1 4PF: not on the flood risk listHA1 4PG: not on the flood risk listHA1 4PH: not on the flood risk listHA1 4PL: not on the flood risk listHA1 4PN: not on the flood risk listHA1 4PP: not on the flood risk listHA1 4PQ: not on the flood risk listHA1 4PU: not on the flood risk listHA1 4PW: not on the flood risk listHA1 4QA: not on the flood risk listHA1 4QB: not on the flood risk listHA1 4QD: not on the flood risk listHA1 4QE: not on the flood risk listHA1 4QF: not on the flood risk listHA1 4QG: not on the flood risk listHA1 4QH: not on the flood risk listHA1 4QJ: not on the flood risk listHA1 4QL: not on the flood risk listHA1 4QN: not on the flood risk listHA1 4QP: not on the flood risk listHA1 4QQ: not on the flood risk listHA1 4QR: not on the flood risk listHA1 4QS: not on the flood risk listHA1 4QT: not on the flood risk listHA1 4QU: not on the flood risk listHA1 4QW: not on the flood risk listHA1 4QX: not on the flood risk listHA1 4QY: not on the flood risk listHA1 4QZ: not on the flood risk listHA1 4RA: not on the flood risk listHA1 4RD: not on the flood risk listHA1 4RG: not on the flood risk listHA1 4RH: not on the flood risk listHA1 4RJ: not on the flood risk listHA1 4RL: not on the flood risk listHA1 4RN: not on the flood risk listHA1 4RP: not on the flood risk listHA1 4RQ: not on the flood risk listHA1 4RR: not on the flood risk listHA1 4RS: not on the flood risk listHA1 4RT: not on the flood risk listHA1 4RU: not on the flood risk listHA1 4RW: not on the flood risk listHA1 4RX: not on the flood risk listHA1 4RY: not on the flood risk listHA1 4RZ: not on the flood risk listHA1 4SA: not on the flood risk listHA1 4SB: not on the flood risk listHA1 4SD: not on the flood risk listHA1 4SE: not on the flood risk listHA1 4SF: not on the flood risk listHA1 4SG: not on the flood risk listHA1 4SH: not on the flood risk listHA1 4SJ: not on the flood risk listHA1 4SL: not on the flood risk listHA1 4SQ: not on the flood risk listHA1 4SS: not on the flood risk listHA1 4ST: not on the flood risk listHA1 4SU: not on the flood risk listHA1 4SW: not on the flood risk listHA1 4SX: not on the flood risk listHA1 4SY: not on the flood risk listHA1 4SZ: not on the flood risk listHA1 4TA: not on the flood risk listHA1 4TB: not on the flood risk listHA1 4TD: not on the flood risk listHA1 4TE: not on the flood risk listHA1 4TF: not on the flood risk listHA1 4TG: not on the flood risk listHA1 4TH: not on the flood risk listHA1 4TJ: not on the flood risk listHA1 4TL: not on the flood risk listHA1 4TN: not on the flood risk listHA1 4TP: not on the flood risk listHA1 4TQ: not on the flood risk listHA1 4TR: not on the flood risk listHA1 4TS: not on the flood risk listHA1 4TU: not on the flood risk listHA1 4TW: not on the flood risk listHA1 4TY: not on the flood risk listHA1 4UB: not on the flood risk listHA1 4UD: not on the flood risk listHA1 4UE: not on the flood risk listHA1 4UF: not on the flood risk listHA1 4UG: not on the flood risk listHA1 4UH: not on the flood risk listHA1 4UP: not on the flood risk listHA1 4UQ: not on the flood risk listHA1 4UR: not on the flood risk listHA1 4UT: not on the flood risk listHA1 4UU: not on the flood risk listHA1 4UW: not on the flood risk listHA1 4UX: not on the flood risk listHA1 4UY: not on the flood risk listHA1 4UZ: not on the flood risk listHA1 4WA: not on the flood risk listHA1 4WB: not on the flood risk listHA1 4WD: not on the flood risk listHA1 4WF: not on the flood risk listHA1 4WJ: not on the flood risk listHA1 4WL: not on the flood risk listHA1 4WN: not on the flood risk listHA1 4WQ: not on the flood risk listHA1 4WR: not on the flood risk listHA1 4WS: not on the flood risk listHA1 4WT: not on the flood risk listHA1 4WX: not on the flood risk listHA1 4WZ: not on the flood risk listHA1 4XA: not on the flood risk listHA1 4XB: not on the flood risk listHA1 4XD: not on the flood risk listHA1 4XE: not on the flood risk listHA1 4XF: not on the flood risk listHA1 4XG: not on the flood risk listHA1 4XH: not on the flood risk listHA1 4XJ: not on the flood risk listHA1 4XQ: not on the flood risk listHA1 4YD: not on the flood risk listHA1 4YE: not on the flood risk listHA1 4YL: not on the flood risk listHA1 4YN: not on the flood risk listHA1 4YP: not on the flood risk listHA1 4YW: not on the flood risk listHA1 4PR: low flood risk at worstHA1 4PD: high flood riskHA1 4PE: high flood riskHA1 4PJ: high flood risk Harrow Map of every postcode in the HA1 4 sector, by flood risk Of the 291 postcodes in the HA1 4 sector that ONS places, 3 have a home or business at high risk, 1 are at low risk at worst and 287 are not on the Environment Agency's at-risk list. Places named: Harrow. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Harrow
  • A home or business at high risk: 3
  • At medium risk at worst: 0
  • At low risk at worst: 1
  • At very low risk only: 0
  • Not on the at-risk list: 287

Of the 291 postcodes in the HA1 4 sector that ONS places, 3 have a home or business at high risk, 1 are at low risk at worst and 287 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.

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.

HA1 4PD7 at high riskHA1 4PE6 at high riskHA1 4PJ1 at high risk

What do homes sell for in HA1 4?

Homes in HA1 4 sold for a typical £562,000 in the 12 months to August 2026, across 65 sales, up 20.7% on the 12 months before, HM Land Registry's figures show.

£562,000 typical price, the 12 months to August 2026
£465,550 12 months to August 2025
▲ up 20.7% on the 12 months before
  • Detached 1 sale, too few to price
  • Semi-detached £610,000 20 sales
  • Terraced £631,500 18 sales
  • Flat or maisonette £344,500 26 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 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 HA1 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.

HA1 4AAHA1 4ABHA1 4ADHA1 4AEHA1 4AFHA1 4AGHA1 4AHHA1 4AJHA1 4ALHA1 4ANHA1 4APHA1 4AQHA1 4ARHA1 4ASHA1 4AWHA1 4AXHA1 4AYHA1 4AZHA1 4BDHA1 4BEHA1 4BFHA1 4BGHA1 4BHHA1 4BJHA1 4BLHA1 4BNHA1 4BPHA1 4BQHA1 4BSHA1 4BTHA1 4BUHA1 4BWHA1 4BXHA1 4BYHA1 4BZHA1 4DAHA1 4DBHA1 4DDHA1 4DEHA1 4DFHA1 4DGHA1 4DHHA1 4DJHA1 4DLHA1 4DNHA1 4DPHA1 4DQHA1 4DRHA1 4DSHA1 4DTHA1 4DUHA1 4DXHA1 4DYHA1 4DZHA1 4EAHA1 4EBHA1 4EDHA1 4EEHA1 4EFHA1 4EGHA1 4EHHA1 4EJHA1 4ELHA1 4ENHA1 4EPHA1 4EQHA1 4ERHA1 4ESHA1 4ETHA1 4EUHA1 4EWHA1 4EXHA1 4EYHA1 4EZHA1 4FLHA1 4FNHA1 4FPHA1 4FRHA1 4FSHA1 4FTHA1 4FUHA1 4FWHA1 4FXHA1 4FYHA1 4FZHA1 4GAHA1 4GBHA1 4GDHA1 4GEHA1 4GFHA1 4GGHA1 4GHHA1 4GJHA1 4GLHA1 4GNHA1 4GPHA1 4GQHA1 4GRHA1 4GSHA1 4GTHA1 4GUHA1 4GWHA1 4GXHA1 4GYHA1 4GZHA1 4HAHA1 4HDHA1 4HEHA1 4HFHA1 4HJHA1 4HLHA1 4HNHA1 4HTHA1 4HUHA1 4HXHA1 4HYHA1 4HZHA1 4JAHA1 4JDHA1 4JEHA1 4JFHA1 4JGHA1 4JHHA1 4JJHA1 4JNHA1 4JPHA1 4JQHA1 4JSHA1 4JTHA1 4JUHA1 4JWHA1 4JXHA1 4JYHA1 4JZHA1 4LAHA1 4LBHA1 4LFHA1 4LNHA1 4LPHA1 4LRHA1 4LSHA1 4LTHA1 4LUHA1 4LWHA1 4LXHA1 4LYHA1 4LZHA1 4NAHA1 4NBHA1 4NDHA1 4NEHA1 4NFHA1 4NGHA1 4NHHA1 4NJHA1 4NLHA1 4NNHA1 4NQHA1 4PAHA1 4PBHA1 4PDHA1 4PEHA1 4PFHA1 4PGHA1 4PHHA1 4PJHA1 4PLHA1 4PNHA1 4PPHA1 4PQHA1 4PRHA1 4PUHA1 4PWHA1 4QAHA1 4QBHA1 4QDHA1 4QEHA1 4QFHA1 4QGHA1 4QHHA1 4QJHA1 4QLHA1 4QNHA1 4QPHA1 4QQHA1 4QRHA1 4QSHA1 4QTHA1 4QUHA1 4QWHA1 4QXHA1 4QYHA1 4QZHA1 4RAHA1 4RDHA1 4RFHA1 4RGHA1 4RHHA1 4RJHA1 4RLHA1 4RNHA1 4RPHA1 4RQHA1 4RRHA1 4RSHA1 4RTHA1 4RUHA1 4RWHA1 4RXHA1 4RYHA1 4RZHA1 4SAHA1 4SBHA1 4SDHA1 4SEHA1 4SFHA1 4SGHA1 4SHHA1 4SJHA1 4SLHA1 4SQHA1 4SSHA1 4STHA1 4SUHA1 4SWHA1 4SXHA1 4SYHA1 4SZHA1 4TAHA1 4TBHA1 4TDHA1 4TEHA1 4TFHA1 4TGHA1 4THHA1 4TJHA1 4TLHA1 4TNHA1 4TPHA1 4TQHA1 4TRHA1 4TSHA1 4TUHA1 4TWHA1 4TYHA1 4UBHA1 4UDHA1 4UEHA1 4UFHA1 4UGHA1 4UHHA1 4UPHA1 4UQHA1 4URHA1 4UTHA1 4UUHA1 4UWHA1 4UXHA1 4UYHA1 4UZHA1 4WAHA1 4WBHA1 4WDHA1 4WFHA1 4WJHA1 4WLHA1 4WNHA1 4WPHA1 4WQHA1 4WRHA1 4WSHA1 4WTHA1 4WXHA1 4WZHA1 4XAHA1 4XBHA1 4XDHA1 4XEHA1 4XFHA1 4XGHA1 4XHHA1 4XJHA1 4XQHA1 4YDHA1 4YEHA1 4YLHA1 4YNHA1 4YPHA1 4YWHA1 4ZUHA1 4ZZ

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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