HA3 7 postcode sector in the HA3 district

HA3 7 is a sector of the HA3 district: every postcode that starts HA3 7. It has 221 postcodes in use, 4 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 HA3 7 sector, by flood risk

Map of every postcode in the HA3 7 sector, by flood risk Of the 221 postcodes in the HA3 7 sector that ONS places, 221 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. HA3 7AA: not on the flood risk listHA3 7AB: not on the flood risk listHA3 7AD: not on the flood risk listHA3 7AE: not on the flood risk listHA3 7AF: not on the flood risk listHA3 7AH: not on the flood risk listHA3 7AL: not on the flood risk listHA3 7AN: not on the flood risk listHA3 7AP: not on the flood risk listHA3 7AR: not on the flood risk listHA3 7AS: not on the flood risk listHA3 7AT: not on the flood risk listHA3 7AU: not on the flood risk listHA3 7AW: not on the flood risk listHA3 7AX: not on the flood risk listHA3 7AY: not on the flood risk listHA3 7BA: not on the flood risk listHA3 7BB: not on the flood risk listHA3 7BD: not on the flood risk listHA3 7BG: not on the flood risk listHA3 7BN: not on the flood risk listHA3 7BP: not on the flood risk listHA3 7BS: not on the flood risk listHA3 7BT: not on the flood risk listHA3 7BU: not on the flood risk listHA3 7BW: not on the flood risk listHA3 7BX: not on the flood risk listHA3 7BY: not on the flood risk listHA3 7BZ: not on the flood risk listHA3 7DA: not on the flood risk listHA3 7DB: not on the flood risk listHA3 7DD: not on the flood risk listHA3 7DE: not on the flood risk listHA3 7DF: not on the flood risk listHA3 7DG: not on the flood risk listHA3 7DH: not on the flood risk listHA3 7DJ: not on the flood risk listHA3 7DL: not on the flood risk listHA3 7DN: not on the flood risk listHA3 7DP: not on the flood risk listHA3 7DQ: not on the flood risk listHA3 7DR: not on the flood risk listHA3 7DU: not on the flood risk listHA3 7DX: not on the flood risk listHA3 7DY: not on the flood risk listHA3 7EA: not on the flood risk listHA3 7EB: not on the flood risk listHA3 7ED: not on the flood risk listHA3 7EE: not on the flood risk listHA3 7EF: not on the flood risk listHA3 7EG: not on the flood risk listHA3 7EH: not on the flood risk listHA3 7EJ: not on the flood risk listHA3 7EL: not on the flood risk listHA3 7EN: not on the flood risk listHA3 7EP: not on the flood risk listHA3 7EQ: not on the flood risk listHA3 7ER: not on the flood risk listHA3 7ET: not on the flood risk listHA3 7EU: not on the flood risk listHA3 7EW: not on the flood risk listHA3 7EY: not on the flood risk listHA3 7EZ: not on the flood risk listHA3 7FA: not on the flood risk listHA3 7FB: not on the flood risk listHA3 7FD: not on the flood risk listHA3 7FE: not on the flood risk listHA3 7FF: not on the flood risk listHA3 7FG: not on the flood risk listHA3 7FH: not on the flood risk listHA3 7FJ: not on the flood risk listHA3 7FL: not on the flood risk listHA3 7HA: not on the flood risk listHA3 7HB: not on the flood risk listHA3 7HD: not on the flood risk listHA3 7HE: not on the flood risk listHA3 7HF: not on the flood risk listHA3 7HG: not on the flood risk listHA3 7HH: not on the flood risk listHA3 7HJ: not on the flood risk listHA3 7HL: not on the flood risk listHA3 7HN: not on the flood risk listHA3 7HP: not on the flood risk listHA3 7HQ: not on the flood risk listHA3 7HR: not on the flood risk listHA3 7HS: not on the flood risk listHA3 7HT: not on the flood risk listHA3 7HU: not on the flood risk listHA3 7HW: not on the flood risk listHA3 7HX: not on the flood risk listHA3 7HY: not on the flood risk listHA3 7HZ: not on the flood risk listHA3 7JA: not on the flood risk listHA3 7JB: not on the flood risk listHA3 7JD: not on the flood risk listHA3 7JE: not on the flood risk listHA3 7JF: not on the flood risk listHA3 7JG: not on the flood risk listHA3 7JJ: not on the flood risk listHA3 7JN: not on the flood risk listHA3 7JP: not on the flood risk listHA3 7JQ: not on the flood risk listHA3 7JS: not on the flood risk listHA3 7JT: not on the flood risk listHA3 7JU: not on the flood risk listHA3 7JW: not on the flood risk listHA3 7JX: not on the flood risk listHA3 7JY: not on the flood risk listHA3 7JZ: not on the flood risk listHA3 7LA: not on the flood risk listHA3 7LB: not on the flood risk listHA3 7LD: not on the flood risk listHA3 7LE: not on the flood risk listHA3 7LF: not on the flood risk listHA3 7LG: not on the flood risk listHA3 7LH: not on the flood risk listHA3 7LJ: not on the flood risk listHA3 7LL: not on the flood risk listHA3 7LP: not on the flood risk listHA3 7LQ: not on the flood risk listHA3 7LR: not on the flood risk listHA3 7LS: not on the flood risk listHA3 7LX: not on the flood risk listHA3 7LY: not on the flood risk listHA3 7LZ: not on the flood risk listHA3 7NA: not on the flood risk listHA3 7NB: not on the flood risk listHA3 7ND: not on the flood risk listHA3 7NE: not on the flood risk listHA3 7NF: not on the flood risk listHA3 7NG: not on the flood risk listHA3 7NH: not on the flood risk listHA3 7NJ: not on the flood risk listHA3 7NL: not on the flood risk listHA3 7NN: not on the flood risk listHA3 7NP: not on the flood risk listHA3 7NQ: not on the flood risk listHA3 7NR: not on the flood risk listHA3 7NS: not on the flood risk listHA3 7NT: not on the flood risk listHA3 7NU: not on the flood risk listHA3 7NW: not on the flood risk listHA3 7NX: not on the flood risk listHA3 7NY: not on the flood risk listHA3 7NZ: not on the flood risk listHA3 7PA: not on the flood risk listHA3 7PB: not on the flood risk listHA3 7PJ: not on the flood risk listHA3 7PL: not on the flood risk listHA3 7PN: not on the flood risk listHA3 7PP: not on the flood risk listHA3 7PR: not on the flood risk listHA3 7PS: not on the flood risk listHA3 7PT: not on the flood risk listHA3 7PU: not on the flood risk listHA3 7PW: not on the flood risk listHA3 7PX: not on the flood risk listHA3 7PY: not on the flood risk listHA3 7PZ: not on the flood risk listHA3 7QA: not on the flood risk listHA3 7QB: not on the flood risk listHA3 7QD: not on the flood risk listHA3 7QE: not on the flood risk listHA3 7QF: not on the flood risk listHA3 7QG: not on the flood risk listHA3 7QQ: not on the flood risk listHA3 7QR: not on the flood risk listHA3 7QS: not on the flood risk listHA3 7QT: not on the flood risk listHA3 7QU: not on the flood risk listHA3 7QX: not on the flood risk listHA3 7QZ: not on the flood risk listHA3 7RA: not on the flood risk listHA3 7RB: not on the flood risk listHA3 7RE: not on the flood risk listHA3 7RF: not on the flood risk listHA3 7RG: not on the flood risk listHA3 7RH: not on the flood risk listHA3 7RL: not on the flood risk listHA3 7RN: not on the flood risk listHA3 7RR: not on the flood risk listHA3 7RT: not on the flood risk listHA3 7RU: not on the flood risk listHA3 7RW: not on the flood risk listHA3 7RX: not on the flood risk listHA3 7SA: not on the flood risk listHA3 7SB: not on the flood risk listHA3 7SE: not on the flood risk listHA3 7SF: not on the flood risk listHA3 7SG: not on the flood risk listHA3 7SH: not on the flood risk listHA3 7SJ: not on the flood risk listHA3 7SL: not on the flood risk listHA3 7SN: not on the flood risk listHA3 7SP: not on the flood risk listHA3 7SQ: not on the flood risk listHA3 7SR: not on the flood risk listHA3 7SS: not on the flood risk listHA3 7ST: not on the flood risk listHA3 7SU: not on the flood risk listHA3 7SW: not on the flood risk listHA3 7SX: not on the flood risk listHA3 7SY: not on the flood risk listHA3 7SZ: not on the flood risk listHA3 7TA: not on the flood risk listHA3 7TB: not on the flood risk listHA3 7TD: not on the flood risk listHA3 7TE: not on the flood risk listHA3 7TF: not on the flood risk listHA3 7TG: not on the flood risk listHA3 7TJ: not on the flood risk listHA3 7TQ: not on the flood risk listHA3 7TU: not on the flood risk listHA3 7UA: not on the flood risk listHA3 7UB: not on the flood risk list Harrow Map of every postcode in the HA3 7 sector, by flood risk Of the 221 postcodes in the HA3 7 sector that ONS places, 221 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. Harrow
  • 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: 221

Of the 221 postcodes in the HA3 7 sector that ONS places, 221 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

What do homes sell for in HA3 7?

Homes in HA3 7 sold for a typical £525,000 in the 12 months to August 2026, across 51 sales, up 3.1% on the 12 months before, HM Land Registry's figures show.

£525,000 typical price, the 12 months to August 2026
£509,000 12 months to August 2025
▲ up 3.1% on the 12 months before
  • Detached 3 sales, too few to price
  • Semi-detached £550,000 14 sales
  • Terraced £530,000 21 sales
  • Flat or maisonette £305,000 13 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 HA3 7. 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 HA3 7

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.

HA3 7AAHA3 7ABHA3 7ADHA3 7AEHA3 7AFHA3 7AHHA3 7ALHA3 7ANHA3 7APHA3 7ARHA3 7ASHA3 7ATHA3 7AUHA3 7AWHA3 7AXHA3 7AYHA3 7BAHA3 7BBHA3 7BDHA3 7BGHA3 7BNHA3 7BPHA3 7BSHA3 7BTHA3 7BUHA3 7BWHA3 7BXHA3 7BYHA3 7BZHA3 7DAHA3 7DBHA3 7DDHA3 7DEHA3 7DFHA3 7DGHA3 7DHHA3 7DJHA3 7DLHA3 7DNHA3 7DPHA3 7DQHA3 7DRHA3 7DUHA3 7DXHA3 7DYHA3 7EAHA3 7EBHA3 7EDHA3 7EEHA3 7EFHA3 7EGHA3 7EHHA3 7EJHA3 7ELHA3 7ENHA3 7EPHA3 7EQHA3 7ERHA3 7ETHA3 7EUHA3 7EWHA3 7EYHA3 7EZHA3 7FAHA3 7FBHA3 7FDHA3 7FEHA3 7FFHA3 7FGHA3 7FHHA3 7FJHA3 7FLHA3 7FNHA3 7FPHA3 7FQHA3 7HAHA3 7HBHA3 7HDHA3 7HEHA3 7HFHA3 7HGHA3 7HHHA3 7HJHA3 7HLHA3 7HNHA3 7HPHA3 7HQHA3 7HRHA3 7HSHA3 7HTHA3 7HUHA3 7HWHA3 7HXHA3 7HYHA3 7HZHA3 7JAHA3 7JBHA3 7JDHA3 7JEHA3 7JFHA3 7JGHA3 7JJHA3 7JNHA3 7JPHA3 7JQHA3 7JSHA3 7JTHA3 7JUHA3 7JWHA3 7JXHA3 7JYHA3 7JZHA3 7LAHA3 7LBHA3 7LDHA3 7LEHA3 7LFHA3 7LGHA3 7LHHA3 7LJHA3 7LLHA3 7LPHA3 7LQHA3 7LRHA3 7LSHA3 7LTHA3 7LXHA3 7LYHA3 7LZHA3 7NAHA3 7NBHA3 7NDHA3 7NEHA3 7NFHA3 7NGHA3 7NHHA3 7NJHA3 7NLHA3 7NNHA3 7NPHA3 7NQHA3 7NRHA3 7NSHA3 7NTHA3 7NUHA3 7NWHA3 7NXHA3 7NYHA3 7NZHA3 7PAHA3 7PBHA3 7PJHA3 7PLHA3 7PNHA3 7PPHA3 7PRHA3 7PSHA3 7PTHA3 7PUHA3 7PWHA3 7PXHA3 7PYHA3 7PZHA3 7QAHA3 7QBHA3 7QDHA3 7QEHA3 7QFHA3 7QGHA3 7QQHA3 7QRHA3 7QSHA3 7QTHA3 7QUHA3 7QXHA3 7QZHA3 7RAHA3 7RBHA3 7REHA3 7RFHA3 7RGHA3 7RHHA3 7RLHA3 7RNHA3 7RRHA3 7RTHA3 7RUHA3 7RWHA3 7RXHA3 7SAHA3 7SBHA3 7SEHA3 7SFHA3 7SGHA3 7SHHA3 7SJHA3 7SLHA3 7SNHA3 7SPHA3 7SQHA3 7SRHA3 7SSHA3 7STHA3 7SUHA3 7SWHA3 7SXHA3 7SYHA3 7SZHA3 7TAHA3 7TBHA3 7TDHA3 7TEHA3 7TFHA3 7TGHA3 7TJHA3 7TQHA3 7TSHA3 7TUHA3 7UAHA3 7UBHA3 7UD

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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