AL4 postcode district: St Albans and around, Hertfordshire

AL4 is a postcode district in Hertfordshire, with 787 postcodes in use in 3 sectors. It has postcodes in St Albans, Wheathampstead, Hatfield and 1 more place. It is split between 4 councils: St Albans (762 postcodes), North Hertfordshire (12), Welwyn Hatfield (10) and 1 other.

Postcodes in use
787
Sectors
3
Councils
4 councils
Places
4 places

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. See all our data sources

Every postcode in AL4, and which are new since 2020

Map of every postcode in AL4, by new since 2020 Of the 787 postcodes in AL4 that ONS places, 15 are new since 2020 and 772 were in use before 2020. Places named: St Albans, Harpenden, Hatfield, Welwyn, Wheathampstead, Welham Green. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2 km. A1081A5183A1(M)A1000 AL4 0AA: before 2020AL4 0AB: before 2020AL4 0AD: before 2020AL4 0AE: before 2020AL4 0AG: before 2020AL4 0AH: before 2020AL4 0AJ: before 2020AL4 0AN: before 2020AL4 0AT: before 2020AL4 0AW: before 2020AL4 0AY: before 2020AL4 0BA: before 2020AL4 0BD: before 2020AL4 0BF: before 2020AL4 0BG: before 2020AL4 0BJ: before 2020AL4 0BN: before 2020AL4 0BP: before 2020AL4 0BS: before 2020AL4 0BT: before 2020AL4 0BU: before 2020AL4 0BW: before 2020AL4 0BX: before 2020AL4 0BY: before 2020AL4 0DB: before 2020AL4 0DE: before 2020AL4 0DF: before 2020AL4 0DG: before 2020AL4 0DH: before 2020AL4 0DJ: before 2020AL4 0DL: before 2020AL4 0DN: before 2020AL4 0DP: before 2020AL4 0DQ: before 2020AL4 0DR: before 2020AL4 0DS: before 2020AL4 0DW: before 2020AL4 0DY: before 2020AL4 0EB: before 2020AL4 0EE: before 2020AL4 0EG: before 2020AL4 0EH: before 2020AL4 0EL: before 2020AL4 0EN: before 2020AL4 0EP: before 2020AL4 0EQ: before 2020AL4 0ES: before 2020AL4 0EW: before 2020AL4 0EX: before 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2020AL4 9PU: before 2020AL4 9QA: before 2020AL4 9QB: before 2020AL4 9QD: before 2020AL4 9QG: before 2020AL4 9QH: before 2020AL4 9QJ: before 2020AL4 9QN: before 2020AL4 9QP: before 2020AL4 9QR: before 2020AL4 9QU: before 2020AL4 9QX: before 2020AL4 9QY: before 2020AL4 9QZ: before 2020AL4 9RB: before 2020AL4 9RD: before 2020AL4 9RH: before 2020AL4 9RL: before 2020AL4 9RN: before 2020AL4 9RP: before 2020AL4 9RR: before 2020AL4 9RS: before 2020AL4 9RU: before 2020AL4 9RW: before 2020AL4 9RX: before 2020AL4 9SJ: before 2020AL4 9SL: before 2020AL4 9SN: before 2020AL4 9SP: before 2020AL4 9ST: before 2020AL4 9SU: before 2020AL4 9SZ: before 2020AL4 9TB: before 2020AL4 9TG: before 2020AL4 9TH: before 2020AL4 9TJ: before 2020AL4 9TL: before 2020AL4 9TN: before 2020AL4 9TQ: before 2020AL4 9TT: before 2020AL4 9TW: before 2020AL4 9TX: before 2020AL4 9TZ: before 2020AL4 9UD: before 2020AL4 9UE: before 2020AL4 9UG: before 2020AL4 9UJ: before 2020AL4 9UP: before 2020AL4 9UR: before 2020AL4 9UW: before 2020AL4 9XB: before 2020AL4 9XD: before 2020AL4 9XE: before 2020AL4 9XG: before 2020AL4 9XJ: before 2020AL4 9XL: before 2020AL4 9XQ: before 2020AL4 9XR: before 2020AL4 9XU: before 2020AL4 9XW: before 2020AL4 9XY: before 2020AL4 9YD: before 2020AL4 9YE: before 2020AL4 9YF: before 2020AL4 9YG: before 2020AL4 9YJ: before 2020AL4 9YL: before 2020AL4 9YQ: before 2020AL4 0NU: before 2020AL4 0PF: before 2020AL4 0BB: new since 2020AL4 0BQ: new since 2020AL4 0HU: new since 2020AL4 0JB: new since 2020AL4 0JR: new since 2020AL4 0JS: new since 2020AL4 0LG: new since 2020AL4 0LW: new since 2020AL4 0LY: new since 2020AL4 0PW: new since 2020AL4 9FP: new since 2020AL4 9FQ: new since 2020AL4 0FY: new since 2020AL4 0LN: new since 2020AL4 8FN: new since 2020 St AlbansHarpendenHatfieldWelwynWheathampsteadWelham Green Map of every postcode in AL4, by new since 2020 Of the 787 postcodes in AL4 that ONS places, 15 are new since 2020 and 772 were in use before 2020. Places named: St Albans, Hatfield, Wheathampstead. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A1081A1(M) St AlbansHatfieldWheathampstead
  • New since 2020: 15
  • In use before 2020: 772

Of the 787 postcodes in AL4 that ONS places, 15 are new since 2020 and 772 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.

The middle of its postcodes: latitude 51.7738, longitude -0.2948. Open this area on OpenStreetMap

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 5 newest postcodes

AL4 0JSMay 2026AL4 0LWSeptember 2025AL4 0LYJuly 2025AL4 0JRJune 2025AL4 9FQFebruary 2025

What broadband can you get in AL4?

Ofcom reports on 780 of the 787 postcodes in AL4. At 643 of them every home and business can get gigabit broadband, and at 6 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit643 of 780
Postcodes where every home can get superfast718 of 780
Postcodes where some cannot get decent broadband6 of 780

Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.

Check one address on Ofcom's checker

Source: Ofcom, Connected Nations, Spring 2026, data for January 2026, Open Government Licence v3.0. How we use it

Is AL4 at risk of flooding?

24 of the 787 postcodes in AL4 have a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts 40 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 24 of 787 postcodes High: 36Medium: 4Low: 82Very low: 24

High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.

Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.

Source: Environment Agency, Risk of Flooding from Rivers and Sea (postcodes in areas at risk), published 6 July 2026, Open Government Licence v3.0. How we use it

What do homes sell for in AL4?

Homes in AL4 sold for a typical £640,000 in the 12 months to August 2026, across 305 sales, down 4.4% on the 12 months before, HM Land Registry's figures show.

£640,000 typical price, the 12 months to August 2026
£669,263 12 months to August 2025
▼ down 4.4% on the 12 months before
  • Detached £890,000 77 sales
  • Semi-detached £718,000 113 sales
  • Terraced £485,000 71 sales
  • Flat or maisonette £287,500 44 sales

Each bar is that kind's typical price, against the most expensive kind here.

Standard sales of homes at market value. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.

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 AL4

Pick a sector, then a postcode. A sector is the district plus the next digit.

AL4 0291 postcodesAL4 8209 postcodesAL4 9287 postcodes
UK postcode format explained

Places in AL4

Towns and villages with postcodes in AL4, and how many each has here.

St Albans postcodes,413Wheathampstead postcodes,127Hatfield postcodes,1London Colney postcodes,1

Who covers AL4

How many of the district's postcodes in use fall under each council, constituency and police force area.

Councils

What council am I in?

Constituencies

  • St Albans432
  • Harpenden and Berkhamsted330
  • Hitchin12
  • Welwyn Hatfield10
  • Hertsmere3

Police force areas

  • Hertfordshire787

Next to AL4

AL3 postcode district AL5 postcode district All AL districts St Albans postcodes

"Next to" is by number: the districts before and after AL4 in the AL area.

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