AL3 4 postcode sector in the AL3 district

AL3 4 is a sector of the AL3 district: every postcode that starts AL3 4. It has 186 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 AL3 4 sector, and which are new since 2020

Map of every postcode in the AL3 4 sector, by new since 2020 Of the 186 postcodes in the AL3 4 sector that ONS places, 2 are new since 2020 and 184 were in use before 2020. 2 postcodes lie beyond the edge and are listed under the map. Places named: Verulam. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A414A4147A5183 AL3 4AA: before 2020AL3 4AB: before 2020AL3 4AD: before 2020AL3 4AE: before 2020AL3 4AF: before 2020AL3 4AH: before 2020AL3 4AJ: before 2020AL3 4AP: before 2020AL3 4AR: before 2020AL3 4AS: before 2020AL3 4AT: before 2020AL3 4AU: before 2020AL3 4AW: before 2020AL3 4AY: before 2020AL3 4AZ: before 2020AL3 4BA: before 2020AL3 4BB: before 2020AL3 4BD: before 2020AL3 4BG: before 2020AL3 4BH: before 2020AL3 4BJ: before 2020AL3 4BL: before 2020AL3 4BN: before 2020AL3 4BQ: before 2020AL3 4BY: before 2020AL3 4BZ: before 2020AL3 4DA: before 2020AL3 4DD: before 2020AL3 4DE: before 2020AL3 4DG: before 2020AL3 4DH: before 2020AL3 4DJ: before 2020AL3 4DL: before 2020AL3 4DN: before 2020AL3 4DP: before 2020AL3 4DQ: before 2020AL3 4DR: before 2020AL3 4DW: before 2020AL3 4EA: before 2020AL3 4EB: before 2020AL3 4ED: before 2020AL3 4EH: before 2020AL3 4EL: before 2020AL3 4EP: before 2020AL3 4ER: before 2020AL3 4ES: before 2020AL3 4ET: before 2020AL3 4EW: before 2020AL3 4EZ: before 2020AL3 4FD: before 2020AL3 4GB: before 2020AL3 4GD: before 2020AL3 4GE: before 2020AL3 4GF: before 2020AL3 4GG: before 2020AL3 4GH: before 2020AL3 4GJ: before 2020AL3 4GL: before 2020AL3 4GN: before 2020AL3 4HA: before 2020AL3 4HB: before 2020AL3 4HD: before 2020AL3 4HE: before 2020AL3 4HG: before 2020AL3 4HH: before 2020AL3 4HJ: before 2020AL3 4HL: before 2020AL3 4HN: before 2020AL3 4HW: before 2020AL3 4HX: before 2020AL3 4HY: before 2020AL3 4HZ: before 2020AL3 4JA: before 2020AL3 4JB: before 2020AL3 4JD: before 2020AL3 4JE: before 2020AL3 4JF: before 2020AL3 4JG: before 2020AL3 4JH: before 2020AL3 4JJ: before 2020AL3 4JL: before 2020AL3 4JN: before 2020AL3 4JP: before 2020AL3 4JQ: before 2020AL3 4JR: before 2020AL3 4JS: before 2020AL3 4JT: before 2020AL3 4JU: before 2020AL3 4JW: before 2020AL3 4JX: before 2020AL3 4JY: before 2020AL3 4JZ: before 2020AL3 4LA: before 2020AL3 4LD: before 2020AL3 4LP: before 2020AL3 4LR: before 2020AL3 4LS: before 2020AL3 4LT: before 2020AL3 4LU: before 2020AL3 4LW: before 2020AL3 4LX: before 2020AL3 4LY: before 2020AL3 4LZ: before 2020AL3 4NA: before 2020AL3 4NB: before 2020AL3 4ND: before 2020AL3 4NE: before 2020AL3 4NF: before 2020AL3 4NG: before 2020AL3 4NH: before 2020AL3 4NJ: before 2020AL3 4NQ: before 2020AL3 4PA: before 2020AL3 4PE: before 2020AL3 4PF: before 2020AL3 4PH: before 2020AL3 4PJ: before 2020AL3 4PN: before 2020AL3 4PQ: before 2020AL3 4PS: before 2020AL3 4PT: before 2020AL3 4PU: before 2020AL3 4PW: before 2020AL3 4PX: before 2020AL3 4PY: before 2020AL3 4PZ: before 2020AL3 4QA: before 2020AL3 4QB: before 2020AL3 4QD: before 2020AL3 4QE: before 2020AL3 4QF: before 2020AL3 4QG: before 2020AL3 4QH: before 2020AL3 4QJ: before 2020AL3 4QL: before 2020AL3 4QN: before 2020AL3 4QP: before 2020AL3 4QQ: before 2020AL3 4QR: before 2020AL3 4QS: before 2020AL3 4QT: before 2020AL3 4QU: before 2020AL3 4QW: before 2020AL3 4QY: before 2020AL3 4RA: before 2020AL3 4RB: before 2020AL3 4RF: before 2020AL3 4RQ: before 2020AL3 4RS: before 2020AL3 4RT: before 2020AL3 4RU: before 2020AL3 4RX: before 2020AL3 4RY: before 2020AL3 4RZ: before 2020AL3 4SA: before 2020AL3 4SB: before 2020AL3 4SD: before 2020AL3 4SE: before 2020AL3 4SF: before 2020AL3 4SG: before 2020AL3 4SH: before 2020AL3 4SJ: before 2020AL3 4SL: before 2020AL3 4SN: before 2020AL3 4SP: before 2020AL3 4SQ: before 2020AL3 4SS: before 2020AL3 4ST: before 2020AL3 4SU: before 2020AL3 4SW: before 2020AL3 4SX: before 2020AL3 4SY: before 2020AL3 4SZ: before 2020AL3 4TA: before 2020AL3 4TB: before 2020AL3 4TF: before 2020AL3 4TG: before 2020AL3 4TH: before 2020AL3 4TL: before 2020AL3 4TN: before 2020AL3 4TQ: before 2020AL3 4TZ: before 2020AL3 4FB: new since 2020AL3 4NR: new since 2020 Verulam Map of every postcode in the AL3 4 sector, by new since 2020 Of the 186 postcodes in the AL3 4 sector that ONS places, 2 are new since 2020 and 184 were in use before 2020. 2 postcodes lie beyond the edge and are listed under the map. Places named: Verulam. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A414 Verulam
  • New since 2020: 2
  • In use before 2020: 184

Of the 186 postcodes in the AL3 4 sector that ONS places, 2 are new since 2020 and 184 were in use before 2020.

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. New since 2020 means it came into use in January 2020 or later. 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; when each came into use: the same directory; 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 2 newest postcodes

AL3 4FBAugust 2023AL3 4NRMarch 2022

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.

AL3 4ALAL3 4HR

What do homes sell for in AL3 4?

Homes in AL3 4 sold for a typical £760,000 in the 12 months to August 2026, across 62 sales, down 3.2% on the 12 months before, HM Land Registry's figures show.

£760,000 typical price, the 12 months to August 2026
£785,000 12 months to August 2025
▼ down 3.2% on the 12 months before
  • Detached £1,162,500 16 sales
  • Semi-detached £865,000 8 sales
  • Terraced £755,000 26 sales
  • Flat or maisonette £417,751 12 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 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 AL3 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.

AL3 4AAAL3 4ABAL3 4ADAL3 4AEAL3 4AFAL3 4AHAL3 4AJAL3 4ALAL3 4APAL3 4ARAL3 4ASAL3 4ATAL3 4AUAL3 4AWAL3 4AYAL3 4AZAL3 4BAAL3 4BBAL3 4BDAL3 4BGAL3 4BHAL3 4BJAL3 4BLAL3 4BNAL3 4BQAL3 4BYAL3 4BZAL3 4DAAL3 4DDAL3 4DEAL3 4DGAL3 4DHAL3 4DJAL3 4DLAL3 4DNAL3 4DPAL3 4DQAL3 4DRAL3 4DWAL3 4EAAL3 4EBAL3 4EDAL3 4EHAL3 4ELAL3 4EPAL3 4ERAL3 4ESAL3 4ETAL3 4EWAL3 4EZAL3 4FBAL3 4FDAL3 4GBAL3 4GDAL3 4GEAL3 4GFAL3 4GGAL3 4GHAL3 4GJAL3 4GLAL3 4GNAL3 4HAAL3 4HBAL3 4HDAL3 4HEAL3 4HGAL3 4HHAL3 4HJAL3 4HLAL3 4HNAL3 4HRAL3 4HWAL3 4HXAL3 4HYAL3 4HZAL3 4JAAL3 4JBAL3 4JDAL3 4JEAL3 4JFAL3 4JGAL3 4JHAL3 4JJAL3 4JLAL3 4JNAL3 4JPAL3 4JQAL3 4JRAL3 4JSAL3 4JTAL3 4JUAL3 4JWAL3 4JXAL3 4JYAL3 4JZAL3 4LAAL3 4LDAL3 4LPAL3 4LRAL3 4LSAL3 4LTAL3 4LUAL3 4LWAL3 4LXAL3 4LYAL3 4LZAL3 4NAAL3 4NBAL3 4NDAL3 4NEAL3 4NFAL3 4NGAL3 4NHAL3 4NJAL3 4NQAL3 4NRAL3 4PAAL3 4PEAL3 4PFAL3 4PHAL3 4PJAL3 4PNAL3 4PQAL3 4PSAL3 4PTAL3 4PUAL3 4PWAL3 4PXAL3 4PYAL3 4PZAL3 4QAAL3 4QBAL3 4QDAL3 4QEAL3 4QFAL3 4QGAL3 4QHAL3 4QJAL3 4QLAL3 4QNAL3 4QPAL3 4QQAL3 4QRAL3 4QSAL3 4QTAL3 4QUAL3 4QWAL3 4QYAL3 4RAAL3 4RBAL3 4RFAL3 4RQAL3 4RSAL3 4RTAL3 4RUAL3 4RXAL3 4RYAL3 4RZAL3 4SAAL3 4SBAL3 4SDAL3 4SEAL3 4SFAL3 4SGAL3 4SHAL3 4SJAL3 4SLAL3 4SNAL3 4SPAL3 4SQAL3 4SSAL3 4STAL3 4SUAL3 4SWAL3 4SXAL3 4SYAL3 4SZAL3 4TAAL3 4TBAL3 4TFAL3 4TGAL3 4THAL3 4TLAL3 4TNAL3 4TQAL3 4TZ

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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