AL3 7 postcode sector in the AL3 district

AL3 7 is a sector of the AL3 district: every postcode that starts AL3 7. It has 184 postcodes in use, 3 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 AL3 7 sector, by flood risk

Map of every postcode in the AL3 7 sector, by flood risk Of the 184 postcodes in the AL3 7 sector that ONS places, 2 have a home or business at high risk, 4 are at low risk at worst, 1 are at very low risk only and 177 are not on the Environment Agency's at-risk list. Places named: St Albans, Harpenden, Redbourn. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2 km. A1081A5183A414A1057 AL3 7AA: not on the flood risk listAL3 7AB: not on the flood risk listAL3 7AD: not on the flood risk listAL3 7AE: not on the flood risk listAL3 7AF: not on the flood risk listAL3 7AG: not on the flood risk listAL3 7AJ: not on the flood risk listAL3 7AL: not on the flood risk listAL3 7AN: not on the flood risk listAL3 7AP: not on the flood risk listAL3 7AQ: not on the flood risk listAL3 7AR: not on the flood risk listAL3 7AS: not on the flood risk listAL3 7AT: not on the flood risk listAL3 7AU: not on the flood risk listAL3 7AW: not on the flood risk listAL3 7BA: not on the flood risk listAL3 7BB: not on the flood risk listAL3 7BD: not on the flood risk listAL3 7BE: not on the flood risk listAL3 7BF: not on the flood risk listAL3 7BG: not on the flood risk listAL3 7BH: not on the flood risk listAL3 7BL: not on the flood risk listAL3 7BN: not on the flood risk listAL3 7BP: not on the flood risk listAL3 7BQ: not on the flood risk listAL3 7BS: not on the flood risk listAL3 7BU: not on the flood risk listAL3 7BW: not on the flood risk listAL3 7BX: not on the flood risk listAL3 7BY: not on the flood risk listAL3 7BZ: not on the flood risk listAL3 7DA: not on the flood risk listAL3 7DB: not on the flood risk listAL3 7DD: not on the flood risk listAL3 7DE: not on the flood risk listAL3 7DF: not on the flood risk listAL3 7DH: not on the flood risk listAL3 7DJ: not on the flood risk listAL3 7DL: not on the flood risk listAL3 7DN: not on the flood risk listAL3 7DP: not on the flood risk listAL3 7DQ: not on the flood risk listAL3 7DR: not on the flood risk listAL3 7DS: not on the flood risk listAL3 7DT: not on the flood risk listAL3 7DU: not on the flood risk listAL3 7DY: not on the flood risk listAL3 7DZ: not on the flood risk listAL3 7EA: not on the flood risk listAL3 7EB: not on the flood risk listAL3 7EG: not on the flood risk listAL3 7EL: not on the flood risk listAL3 7EN: not on the flood risk listAL3 7EP: not on the flood risk listAL3 7EQ: not on the flood risk listAL3 7ES: not on the flood risk listAL3 7ET: not on the flood risk listAL3 7EU: not on the flood risk listAL3 7EX: not on the flood risk listAL3 7EY: not on the flood risk listAL3 7EZ: not on the flood risk listAL3 7FA: not on the flood risk listAL3 7FB: not on the flood risk listAL3 7FD: not on the flood risk listAL3 7GA: not on the flood risk listAL3 7GD: not on the flood risk listAL3 7GE: not on the flood risk listAL3 7GF: not on the flood risk listAL3 7HA: not on the flood risk listAL3 7HB: not on the flood risk listAL3 7HD: not on the flood risk listAL3 7HE: not on the flood risk listAL3 7HF: not on the flood risk listAL3 7HP: not on the flood risk listAL3 7HQ: not on the flood risk listAL3 7HS: not on the flood risk listAL3 7HT: not on the flood risk listAL3 7HU: not on the flood risk listAL3 7HW: not on the flood risk listAL3 7HY: not on the flood risk listAL3 7HZ: not on the flood risk listAL3 7JA: not on the flood risk listAL3 7JB: not on the flood risk listAL3 7JD: not on the flood risk listAL3 7JE: not on the flood risk listAL3 7JF: not on the flood risk listAL3 7JG: not on the flood risk listAL3 7JH: not on the flood risk listAL3 7JJ: not on the flood risk listAL3 7JL: not on the flood risk listAL3 7JN: not on the flood risk listAL3 7JP: not on the flood risk listAL3 7JQ: not on the flood risk listAL3 7JR: not on the flood risk listAL3 7JU: not on the flood risk listAL3 7JW: not on the flood risk listAL3 7JX: not on the flood risk listAL3 7JY: not on the flood risk listAL3 7JZ: not on the flood risk listAL3 7LB: not on the flood risk listAL3 7LD: not on the flood risk listAL3 7LE: not on the flood risk listAL3 7LF: not on the flood risk listAL3 7LP: not on the flood risk listAL3 7LQ: not on the flood risk listAL3 7LR: not on the flood risk listAL3 7LS: not on the flood risk listAL3 7LU: not on the flood risk listAL3 7LY: not on the flood risk listAL3 7NB: not on the flood risk listAL3 7ND: not on the flood risk listAL3 7NG: not on the flood risk listAL3 7NJ: not on the flood risk listAL3 7NL: not on the flood risk listAL3 7NN: not on the flood risk listAL3 7NP: not on the flood risk listAL3 7NQ: not on the flood risk listAL3 7NS: not on the flood risk listAL3 7NW: not on the flood risk listAL3 7NX: not on the flood risk listAL3 7NZ: not on the flood risk listAL3 7PB: not on the flood risk listAL3 7PE: not on the flood risk listAL3 7PF: not on the flood risk listAL3 7PG: not on the flood risk listAL3 7PH: not on the flood risk listAL3 7PJ: not on the flood risk listAL3 7PL: not on the flood risk listAL3 7PN: not on the flood risk listAL3 7PP: not on the flood risk listAL3 7PR: not on the flood risk listAL3 7PS: not on the flood risk listAL3 7PT: not on the flood risk listAL3 7PU: not on the flood risk listAL3 7PW: not on the flood risk listAL3 7PX: not on the flood risk listAL3 7PY: not on the flood risk listAL3 7PZ: not on the flood risk listAL3 7QA: not on the flood risk listAL3 7QB: not on the flood risk listAL3 7QE: not on the flood risk listAL3 7QN: not on the flood risk listAL3 7QQ: not on the flood risk listAL3 7RG: not on the flood risk listAL3 7RQ: not on the flood risk listAL3 7SA: not on the flood risk listAL3 7ZR: not on the flood risk listAL3 7LH: very low flood risk onlyAL3 7LG: low flood risk at worstAL3 7LT: low flood risk at worstAL3 7PD: low flood risk at worstAL3 7QG: low flood risk at worstAL3 7LA: high flood riskAL3 7NH: high flood risk St AlbansHarpendenRedbourn Map of every postcode in the AL3 7 sector, by flood risk Of the 184 postcodes in the AL3 7 sector that ONS places, 2 have a home or business at high risk, 4 are at low risk at worst, 1 are at very low risk only and 177 are not on the Environment Agency's at-risk list. Places named: St Albans, Harpenden, Redbourn. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A1081A5183A414 St AlbansHarpendenRedbourn
  • A home or business at high risk: 2
  • At medium risk at worst: 0
  • At low risk at worst: 4
  • At very low risk only: 1
  • Not on the at-risk list: 177

Of the 184 postcodes in the AL3 7 sector that ONS places, 2 have a home or business at high risk, 4 are at low risk at worst, 1 are at very low risk only and 177 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.

AL3 7NH2 at high riskAL3 7LA2 at high risk

What do homes sell for in AL3 7?

Homes in AL3 7 sold for a typical £605,000 in the 12 months to August 2026, across 63 sales, up 3.4% on the 12 months before, HM Land Registry's figures show.

£605,000 typical price, the 12 months to August 2026
£585,000 12 months to August 2025
▲ up 3.4% on the 12 months before
  • Detached £908,500 16 sales
  • Semi-detached £612,500 24 sales
  • Terraced £460,000 18 sales
  • Flat or maisonette £350,000 5 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 AL3 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 AL3 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.

AL3 7AAAL3 7ABAL3 7ADAL3 7AEAL3 7AFAL3 7AGAL3 7AJAL3 7ALAL3 7ANAL3 7APAL3 7AQAL3 7ARAL3 7ASAL3 7ATAL3 7AUAL3 7AWAL3 7BAAL3 7BBAL3 7BDAL3 7BEAL3 7BFAL3 7BGAL3 7BHAL3 7BJAL3 7BLAL3 7BNAL3 7BPAL3 7BQAL3 7BSAL3 7BTAL3 7BUAL3 7BWAL3 7BXAL3 7BYAL3 7BZAL3 7DAAL3 7DBAL3 7DDAL3 7DEAL3 7DFAL3 7DGAL3 7DHAL3 7DJAL3 7DLAL3 7DNAL3 7DPAL3 7DQAL3 7DRAL3 7DSAL3 7DTAL3 7DUAL3 7DWAL3 7DYAL3 7DZAL3 7EAAL3 7EBAL3 7EGAL3 7ELAL3 7ENAL3 7EPAL3 7EQAL3 7ERAL3 7ESAL3 7ETAL3 7EUAL3 7EWAL3 7EXAL3 7EYAL3 7EZAL3 7FAAL3 7FBAL3 7FDAL3 7FEAL3 7GAAL3 7GDAL3 7GEAL3 7GFAL3 7GHAL3 7HAAL3 7HBAL3 7HDAL3 7HEAL3 7HFAL3 7HGAL3 7HNAL3 7HPAL3 7HQAL3 7HRAL3 7HSAL3 7HTAL3 7HUAL3 7HWAL3 7HXAL3 7HYAL3 7HZAL3 7JAAL3 7JBAL3 7JDAL3 7JEAL3 7JFAL3 7JGAL3 7JHAL3 7JJAL3 7JLAL3 7JNAL3 7JPAL3 7JQAL3 7JRAL3 7JSAL3 7JTAL3 7JUAL3 7JWAL3 7JXAL3 7JYAL3 7JZAL3 7LAAL3 7LBAL3 7LDAL3 7LEAL3 7LFAL3 7LGAL3 7LHAL3 7LJAL3 7LLAL3 7LNAL3 7LPAL3 7LQAL3 7LRAL3 7LSAL3 7LTAL3 7LUAL3 7LWAL3 7LXAL3 7LYAL3 7LZAL3 7NBAL3 7NDAL3 7NGAL3 7NHAL3 7NJAL3 7NLAL3 7NNAL3 7NPAL3 7NQAL3 7NRAL3 7NSAL3 7NTAL3 7NUAL3 7NWAL3 7NXAL3 7NYAL3 7NZAL3 7PAAL3 7PBAL3 7PDAL3 7PEAL3 7PFAL3 7PGAL3 7PHAL3 7PJAL3 7PLAL3 7PNAL3 7PPAL3 7PQAL3 7PRAL3 7PSAL3 7PTAL3 7PUAL3 7PWAL3 7PXAL3 7PYAL3 7PZAL3 7QAAL3 7QBAL3 7QEAL3 7QFAL3 7QGAL3 7QNAL3 7QPAL3 7QQAL3 7RGAL3 7RQAL3 7SAAL3 7ZR

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

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