AL5 3 postcode sector in the AL5 district

AL5 3 is a sector of the AL5 district: every postcode that starts AL5 3. It has 141 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 AL5 3 sector, by flood risk

Map of every postcode in the AL5 3 sector, by flood risk Of the 141 postcodes in the AL5 3 sector that ONS places, 141 are not on the Environment Agency's at-risk list. 2 postcodes lie beyond the edge and are listed under the map. Places named: Harpenden North & Rural. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A1081M1 AL5 3AB: not on the flood risk listAL5 3AD: not on the flood risk listAL5 3AE: not on the flood risk listAL5 3AF: not on the flood risk listAL5 3AG: not on the flood risk listAL5 3AH: not on the flood risk listAL5 3AJ: not on the flood risk listAL5 3AL: not on the flood risk listAL5 3AN: not on the flood risk listAL5 3AP: not on the flood risk listAL5 3AQ: not on the flood risk listAL5 3AR: not on the flood risk listAL5 3AS: not on the flood risk listAL5 3AT: not on the flood risk listAL5 3AU: not on the flood risk listAL5 3AW: not on the flood risk listAL5 3AY: not on the flood risk listAL5 3AZ: not on the flood risk listAL5 3BA: not on the flood risk listAL5 3BB: not on the flood risk listAL5 3BD: not on the flood risk listAL5 3BE: not on the flood risk listAL5 3BG: not on the flood risk listAL5 3BH: not on the flood risk listAL5 3BJ: not on the flood risk listAL5 3BL: not on the flood risk listAL5 3BN: not on the flood risk listAL5 3BP: not on the flood risk listAL5 3BQ: not on the flood risk listAL5 3BS: not on the flood risk listAL5 3BT: not on the flood risk listAL5 3BU: not on the flood risk listAL5 3BW: not on the flood risk listAL5 3BX: not on the flood risk listAL5 3BY: not on the flood risk listAL5 3BZ: not on the flood risk listAL5 3DD: not on the flood risk listAL5 3DE: not on the flood risk listAL5 3DP: not on the flood risk listAL5 3DR: not on the flood risk listAL5 3DS: not on the flood risk listAL5 3DT: not on the flood risk listAL5 3DU: not on the flood risk listAL5 3DW: not on the flood risk listAL5 3DZ: not on the flood risk listAL5 3EB: not on the flood risk listAL5 3ED: not on the flood risk listAL5 3EE: not on the flood risk listAL5 3EF: not on the flood risk listAL5 3EG: not on the flood risk listAL5 3EH: not on the flood risk listAL5 3EJ: not on the flood risk listAL5 3EL: not on the flood risk listAL5 3EN: not on the flood risk listAL5 3EP: not on the flood risk listAL5 3EQ: not on the flood risk listAL5 3ER: not on the flood risk listAL5 3ES: not on the flood risk listAL5 3ET: not on the flood risk listAL5 3EU: not on the flood risk listAL5 3EW: not on the flood risk listAL5 3EX: not on the flood risk listAL5 3EY: not on the flood risk listAL5 3EZ: not on the flood risk listAL5 3FA: not on the flood risk listAL5 3HA: not on the flood risk listAL5 3HB: not on the flood risk listAL5 3HD: not on the flood risk listAL5 3HE: not on the flood risk listAL5 3HF: not on the flood risk listAL5 3HG: not on the flood risk listAL5 3HH: not on the flood risk listAL5 3HJ: not on the flood risk listAL5 3HN: not on the flood risk listAL5 3HP: not on the flood risk listAL5 3HQ: not on the flood risk listAL5 3HR: not on the flood risk listAL5 3HS: not on the flood risk listAL5 3HT: not on the flood risk listAL5 3HW: not on the flood risk listAL5 3LA: not on the flood risk listAL5 3LE: not on the flood risk listAL5 3LG: not on the flood risk listAL5 3LH: not on the flood risk listAL5 3LJ: not on the flood risk listAL5 3LL: not on the flood risk listAL5 3LN: not on the flood risk listAL5 3LP: not on the flood risk listAL5 3LQ: not on the flood risk listAL5 3LR: not on the flood risk listAL5 3LS: not on the flood risk listAL5 3LT: not on the flood risk listAL5 3LU: not on the flood risk listAL5 3LW: not on the flood risk listAL5 3LX: not on the flood risk listAL5 3LY: not on the flood risk listAL5 3LZ: not on the flood risk listAL5 3NA: not on the flood risk listAL5 3NB: not on the flood risk listAL5 3ND: not on the flood risk listAL5 3NE: not on the flood risk listAL5 3NF: not on the flood risk listAL5 3NG: not on the flood risk listAL5 3NH: not on the flood risk listAL5 3NJ: not on the flood risk listAL5 3NL: not on the flood risk listAL5 3NN: not on the flood risk listAL5 3NP: not on the flood risk listAL5 3NR: not on the flood risk listAL5 3NS: not on the flood risk listAL5 3NT: not on the flood risk listAL5 3NU: not on the flood risk listAL5 3NX: not on the flood risk listAL5 3NY: not on the flood risk listAL5 3NZ: not on the flood risk listAL5 3PA: not on the flood risk listAL5 3PB: not on the flood risk listAL5 3PD: not on the flood risk listAL5 3PE: not on the flood risk listAL5 3PF: not on the flood risk listAL5 3PG: not on the flood risk listAL5 3PH: not on the flood risk listAL5 3PJ: not on the flood risk listAL5 3PL: not on the flood risk listAL5 3PN: not on the flood risk listAL5 3PP: not on the flood risk listAL5 3PQ: not on the flood risk listAL5 3PR: not on the flood risk listAL5 3PS: not on the flood risk listAL5 3PT: not on the flood risk listAL5 3PU: not on the flood risk listAL5 3PW: not on the flood risk listAL5 3PY: not on the flood risk listAL5 3PZ: not on the flood risk listAL5 3QB: not on the flood risk listAL5 3QD: not on the flood risk listAL5 3QE: not on the flood risk listAL5 3QF: not on the flood risk listAL5 3RA: not on the flood risk list Harpenden North & Rural Map of every postcode in the AL5 3 sector, by flood risk Of the 141 postcodes in the AL5 3 sector that ONS places, 141 are not on the Environment Agency's at-risk list. 2 postcodes lie beyond the edge and are listed under the map. Places named: Harpenden North & Rural. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. Harpenden North & Rural
  • 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: 141

Of the 141 postcodes in the AL5 3 sector that ONS places, 141 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

2 further out, not drawn

These postcodes lie well apart from the rest, so the map is drawn without them to show the rest closer; they are in every count.

AL5 3NRAL5 3ZX

What do homes sell for in AL5 3?

Homes in AL5 3 sold for a typical £960,000 in the 12 months to August 2026, across 55 sales, up 3.8% on the 12 months before, HM Land Registry's figures show.

£960,000 typical price, the 12 months to August 2026
£925,000 12 months to August 2025
▲ up 3.8% on the 12 months before
  • Detached £1,160,000 25 sales
  • Semi-detached £907,500 16 sales
  • Terraced £717,230 9 sales
  • Flat or maisonette £385,000 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 AL5 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 AL5 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.

AL5 3ABAL5 3ADAL5 3AEAL5 3AFAL5 3AGAL5 3AHAL5 3AJAL5 3ALAL5 3ANAL5 3APAL5 3AQAL5 3ARAL5 3ASAL5 3ATAL5 3AUAL5 3AWAL5 3AYAL5 3AZAL5 3BAAL5 3BBAL5 3BDAL5 3BEAL5 3BGAL5 3BHAL5 3BJAL5 3BLAL5 3BNAL5 3BPAL5 3BQAL5 3BSAL5 3BTAL5 3BUAL5 3BWAL5 3BXAL5 3BYAL5 3BZAL5 3DDAL5 3DEAL5 3DPAL5 3DRAL5 3DSAL5 3DTAL5 3DUAL5 3DWAL5 3DZAL5 3EBAL5 3EDAL5 3EEAL5 3EFAL5 3EGAL5 3EHAL5 3EJAL5 3ELAL5 3ENAL5 3EPAL5 3EQAL5 3ERAL5 3ESAL5 3ETAL5 3EUAL5 3EWAL5 3EXAL5 3EYAL5 3EZAL5 3FAAL5 3HAAL5 3HBAL5 3HDAL5 3HEAL5 3HFAL5 3HGAL5 3HHAL5 3HJAL5 3HNAL5 3HPAL5 3HQAL5 3HRAL5 3HSAL5 3HTAL5 3HWAL5 3LAAL5 3LEAL5 3LFAL5 3LGAL5 3LHAL5 3LJAL5 3LLAL5 3LNAL5 3LPAL5 3LQAL5 3LRAL5 3LSAL5 3LTAL5 3LUAL5 3LWAL5 3LXAL5 3LYAL5 3LZAL5 3NAAL5 3NBAL5 3NDAL5 3NEAL5 3NFAL5 3NGAL5 3NHAL5 3NJAL5 3NLAL5 3NNAL5 3NPAL5 3NRAL5 3NSAL5 3NTAL5 3NUAL5 3NXAL5 3NYAL5 3NZAL5 3PAAL5 3PBAL5 3PDAL5 3PEAL5 3PFAL5 3PGAL5 3PHAL5 3PJAL5 3PLAL5 3PNAL5 3PPAL5 3PQAL5 3PRAL5 3PSAL5 3PTAL5 3PUAL5 3PWAL5 3PYAL5 3PZAL5 3QBAL5 3QDAL5 3QEAL5 3QFAL5 3RAAL5 3ZX

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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