AL6 postcode district: Woolmer Green and around, Hertfordshire

AL6 is a postcode district in Hertfordshire, with 506 postcodes in use in 2 sectors. It has postcodes in Woolmer Green, Welwyn and Welwyn Garden City. It is split between 4 councils: Welwyn Hatfield (391 postcodes), East Hertfordshire (75), North Hertfordshire (38) and 1 other.

Postcodes in use
506
Sectors
2
Councils
4 councils
Places
3 places

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

Every postcode in AL6, by flood risk

Map of every postcode in AL6, by flood risk Of the 506 postcodes in AL6 that ONS places, 1 have a home or business at high risk, 2 are at medium risk at worst, 12 are at low risk at worst and 491 are not on the Environment Agency's at-risk list. Places named: Woolmer Green, Welwyn, Codicote. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. AL6 0AA: not on the flood risk listAL6 0AB: not on the flood risk listAL6 0AD: not on the flood risk listAL6 0AE: not on the flood risk listAL6 0AG: not on the flood risk listAL6 0AH: not on the flood risk listAL6 0AJ: not on the flood risk listAL6 0AL: not on the flood risk listAL6 0AN: not on the flood risk listAL6 0AP: not on the flood risk listAL6 0AQ: not on the flood risk listAL6 0AR: not on the flood risk listAL6 0AS: not on the flood risk listAL6 0AT: not on the flood risk listAL6 0AU: not on the flood risk listAL6 0AW: not on the flood risk listAL6 0AX: not on the flood risk listAL6 0AZ: not on the flood risk listAL6 0BA: not on the flood risk listAL6 0BB: not on the flood risk listAL6 0BE: not on the flood risk listAL6 0BH: not on the flood risk listAL6 0BJ: not on the flood risk listAL6 0BL: not on the flood risk listAL6 0BN: not on the flood risk listAL6 0BS: not on the flood risk listAL6 0BU: not on the flood risk listAL6 0BY: not on the flood risk listAL6 0BZ: not on the flood risk listAL6 0DA: not on the flood risk listAL6 0DB: not on the flood risk listAL6 0DD: not on the flood risk listAL6 0DE: not on the flood risk listAL6 0DF: not on the flood risk listAL6 0DG: not on the flood risk listAL6 0DH: not on the flood risk listAL6 0DJ: not on the flood risk listAL6 0DL: not on the flood risk listAL6 0DN: not on the flood risk listAL6 0DQ: not on the flood risk listAL6 0DR: not on the flood risk listAL6 0DW: not on the flood risk listAL6 0DX: not on the flood risk listAL6 0DY: not on the flood risk listAL6 0DZ: not on the flood risk listAL6 0EA: not on the flood risk listAL6 0EB: not on the flood risk listAL6 0EE: not on the flood risk listAL6 0EF: not on the flood risk listAL6 0EG: not on the flood risk listAL6 0EH: not on the flood risk listAL6 0EJ: not on the flood risk listAL6 0EL: not on the flood risk listAL6 0EN: not on the flood risk listAL6 0EP: not on the flood risk listAL6 0EQ: not on the flood risk listAL6 0ER: not on the flood risk listAL6 0ES: not on the flood risk listAL6 0ET: not on the flood risk listAL6 0EU: not on the flood risk listAL6 0EW: not on the flood risk listAL6 0EY: not on the flood risk listAL6 0EZ: not on the flood risk listAL6 0FD: not on the flood risk listAL6 0FF: not on the flood risk listAL6 0FH: not on the flood risk listAL6 0FJ: not on the flood risk listAL6 0FL: not on the flood risk listAL6 0FN: not on the flood risk listAL6 0GD: not on the flood risk listAL6 0HA: not on the flood risk listAL6 0HB: not on the flood risk listAL6 0HD: not on the flood risk listAL6 0HE: not on the flood risk listAL6 0HF: not on the flood risk listAL6 0HG: not on the flood risk listAL6 0HH: not on the flood risk listAL6 0HJ: not on the flood risk listAL6 0HL: not on the flood risk listAL6 0HN: not on the flood risk listAL6 0HP: not on the flood risk listAL6 0HQ: not on the flood risk listAL6 0HT: not on the flood risk listAL6 0HU: not on the flood risk listAL6 0HW: not on the flood risk listAL6 0HZ: not on the flood risk listAL6 0JB: not on the flood risk listAL6 0JD: not on the flood risk listAL6 0JE: not on the flood risk listAL6 0JJ: not on the flood risk listAL6 0JL: not on the flood risk listAL6 0JN: not on the flood risk listAL6 0JP: not on the flood risk listAL6 0JR: not on the flood risk listAL6 0JS: not on the flood risk listAL6 0JT: not on the flood risk listAL6 0JU: not on the flood risk listAL6 0JW: not on the flood risk listAL6 0JX: not on the flood risk listAL6 0JY: not on the flood risk listAL6 0JZ: not on the flood risk listAL6 0LA: not on the flood risk listAL6 0LB: not on the flood risk listAL6 0LD: not on the flood risk listAL6 0LE: not on the flood risk listAL6 0LF: not on the flood risk listAL6 0LG: not on the flood risk listAL6 0LH: not on the flood risk listAL6 0LJ: not on the flood risk listAL6 0LL: not on the flood risk listAL6 0LN: not on the flood risk listAL6 0LP: not on the flood risk listAL6 0LQ: not on the flood risk listAL6 0LR: not on the flood risk listAL6 0LS: not on the flood risk listAL6 0LT: not on the flood risk listAL6 0LU: not on the flood risk listAL6 0LW: not on the flood risk listAL6 0LX: not on the flood risk listAL6 0LY: not on the flood risk listAL6 0LZ: not on the flood risk listAL6 0NG: not on the flood risk listAL6 0NH: not on the flood risk listAL6 0NJ: not on the flood risk listAL6 0NL: not on the flood risk listAL6 0NN: not on the flood risk listAL6 0NP: not on the flood risk listAL6 0NR: not on the flood risk listAL6 0NS: not on the flood risk listAL6 0NU: not on the flood risk listAL6 0NX: not on the flood risk listAL6 0NY: not on the flood risk listAL6 0NZ: not on the flood risk listAL6 0PA: not on the flood risk listAL6 0PB: not on the flood risk listAL6 0PD: not on the flood risk listAL6 0PE: not on the flood risk listAL6 0PG: not on the flood risk listAL6 0PH: not on the flood risk listAL6 0PJ: not on the flood risk listAL6 0PL: not on the flood risk listAL6 0PN: not on the flood risk listAL6 0PP: not on the flood risk listAL6 0PQ: not on the flood risk listAL6 0PR: not on the flood risk listAL6 0PS: not on the flood risk listAL6 0PT: not on the flood risk listAL6 0PU: not on the flood risk listAL6 0PW: not on the flood risk listAL6 0PX: not on the flood risk listAL6 0PY: not on the flood risk listAL6 0PZ: not on the flood risk listAL6 0QA: not on the flood risk listAL6 0QB: not on the flood risk listAL6 0QD: not on the flood risk listAL6 0QE: not on the flood risk listAL6 0QG: not on the flood risk listAL6 0QH: not on the flood risk listAL6 0QJ: not on the flood risk listAL6 0QL: not on the flood risk listAL6 0QN: not on the flood risk listAL6 0QP: not on the flood risk listAL6 0QQ: not on the flood risk listAL6 0QR: not on the flood risk listAL6 0QS: not on the flood risk listAL6 0QT: not on the flood risk listAL6 0QU: not on the flood risk listAL6 0QW: not on the flood risk listAL6 0QX: not on the flood risk listAL6 0QY: not on the flood risk listAL6 0QZ: not on the flood risk listAL6 0RB: not on the flood risk listAL6 0RD: not on the flood risk listAL6 0RE: not on the flood risk listAL6 0RF: not on the flood risk listAL6 0RG: not on the flood risk listAL6 0RH: not on the flood risk listAL6 0RJ: not on the flood risk listAL6 0RL: not on the flood risk listAL6 0RN: not on the flood risk listAL6 0RP: not on the flood risk listAL6 0RQ: not on the flood risk listAL6 0RR: not on the flood risk listAL6 0RS: not on the flood risk listAL6 0RU: not on the flood risk listAL6 0RW: not on the flood risk listAL6 0RX: not on the flood risk listAL6 0RZ: not on the flood risk listAL6 0SB: not on the flood risk listAL6 0SD: not on the flood risk listAL6 0SE: not on the flood risk listAL6 0SF: not on the flood risk listAL6 0SG: not on the flood risk listAL6 0SJ: not on the flood risk listAL6 0SL: not on the flood risk listAL6 0SN: not on the flood risk listAL6 0SP: not on the flood risk listAL6 0SQ: not on the flood risk listAL6 0SR: not on the flood risk listAL6 0SS: not on the flood risk listAL6 0ST: not on the flood risk listAL6 0SX: not on the flood risk listAL6 0SZ: not on the flood risk listAL6 0TA: not on the flood risk listAL6 0TB: not on the flood risk listAL6 0TD: not on the flood risk listAL6 0TE: not on the flood risk listAL6 0TH: not on the flood risk listAL6 0TL: not on the flood risk listAL6 0TN: not on the flood risk listAL6 0TP: not on the flood risk listAL6 0TR: not on the flood risk listAL6 0TS: not on the flood risk listAL6 0TT: not on the flood risk listAL6 0TU: not on the flood risk listAL6 0TX: not on the flood risk listAL6 0TY: not on the flood risk listAL6 0TZ: not on the flood risk listAL6 0UA: not on the flood risk listAL6 0UB: not on the flood risk listAL6 0UD: not on the flood risk listAL6 0UE: not on the flood risk listAL6 0UG: not on the flood risk listAL6 0UH: not on the flood risk listAL6 0UJ: not on the flood risk listAL6 0UL: not on the flood risk listAL6 0UN: not on the flood risk listAL6 0UQ: not on the flood risk listAL6 0UR: not on the flood risk listAL6 0UU: not on the flood risk listAL6 0UW: not on the flood risk listAL6 0UX: not on the flood risk listAL6 0UY: not on the flood risk listAL6 0UZ: not on the flood risk listAL6 0WG: not on the flood risk listAL6 0XB: not on the flood risk listAL6 0XD: not on the flood risk listAL6 0XE: not on the flood risk listAL6 0XF: not on the flood risk listAL6 0XG: not on the flood risk listAL6 9AA: not on the flood risk listAL6 9AB: not on the flood risk listAL6 9AD: not on the flood risk listAL6 9AE: not on the flood risk listAL6 9AF: not on the flood risk listAL6 9AH: not on the flood risk listAL6 9AJ: not on the flood risk listAL6 9AL: not on the flood risk listAL6 9AS: not on the flood risk listAL6 9AT: not on the flood risk listAL6 9AU: not on the flood risk listAL6 9BA: not on the flood risk listAL6 9BB: not on the flood risk listAL6 9BD: not on the flood risk listAL6 9BE: not on the flood risk listAL6 9BG: not on the flood risk listAL6 9BH: not on the flood risk listAL6 9BJ: not on the flood risk listAL6 9BL: not on the flood risk listAL6 9BN: not on the flood risk listAL6 9BP: not on the flood risk listAL6 9BQ: not on the flood risk listAL6 9BS: not on the flood risk listAL6 9BT: not on the flood risk listAL6 9BU: not on the flood risk listAL6 9BW: not on the flood risk listAL6 9BX: not on the flood risk listAL6 9BY: not on the flood risk listAL6 9BZ: not on the flood risk listAL6 9DA: not on the flood risk listAL6 9DB: not on the flood risk listAL6 9DF: not on the flood risk listAL6 9DJ: not on the flood risk listAL6 9DL: not on the flood risk listAL6 9DN: not on the flood risk listAL6 9DP: not on the flood risk listAL6 9DQ: not on the flood risk listAL6 9DW: not on the flood risk listAL6 9DY: not on the flood risk listAL6 9EE: not on the flood risk listAL6 9EH: not on the flood risk listAL6 9EN: not on the flood risk listAL6 9EP: not on the flood risk listAL6 9ER: not on the flood risk listAL6 9ES: not on the flood risk listAL6 9EY: not on the flood risk listAL6 9FB: not on the flood risk listAL6 9FD: not on the flood risk listAL6 9FE: not on the flood risk listAL6 9FF: not on the flood risk listAL6 9FG: not on the flood risk listAL6 9FH: not on the flood risk listAL6 9FL: not on the flood risk listAL6 9FN: not on the flood risk listAL6 9FP: not on the flood risk listAL6 9FR: not on the flood risk listAL6 9FU: not on the flood risk listAL6 9FW: not on the flood risk listAL6 9FX: not on the flood risk listAL6 9FY: not on the flood risk listAL6 9FZ: not on the flood risk listAL6 9GA: not on the flood risk listAL6 9GB: not on the flood risk listAL6 9GD: not on the flood risk listAL6 9GF: not on the flood risk listAL6 9GG: not on the flood risk listAL6 9GH: not on the flood risk listAL6 9GL: not on the flood risk listAL6 9GN: not on the flood risk listAL6 9GP: not on the flood risk listAL6 9GQ: not on the flood risk listAL6 9GR: not on the flood risk listAL6 9HB: not on the flood risk listAL6 9HN: not on the flood risk listAL6 9HR: not on the flood risk listAL6 9HS: not on the flood risk listAL6 9HT: not on the flood risk listAL6 9HX: not on the flood risk listAL6 9HY: not on the flood risk listAL6 9JA: not on the flood risk listAL6 9JB: not on the flood risk listAL6 9JE: not on the flood risk listAL6 9JF: not on the flood risk listAL6 9JG: not on the flood risk listAL6 9JH: not on the flood risk listAL6 9JJ: not on the flood risk listAL6 9JL: not on the flood risk listAL6 9JN: not on the flood risk listAL6 9JP: not on the flood risk listAL6 9JQ: not on the flood risk listAL6 9JR: not on the flood risk listAL6 9JS: not on the flood risk listAL6 9JT: not on the flood risk listAL6 9JZ: not on the flood risk listAL6 9LA: not on the flood risk listAL6 9LB: not on the flood risk listAL6 9LD: not on the flood risk listAL6 9LE: not on the flood risk listAL6 9LN: not on the flood risk listAL6 9LR: not on the flood risk listAL6 9LS: not on the flood risk listAL6 9LT: not on the flood risk listAL6 9LU: not on the flood risk listAL6 9LY: not on the flood risk listAL6 9NB: not on the flood risk listAL6 9ND: not on the flood risk listAL6 9NE: not on the flood risk listAL6 9NF: not on the flood risk listAL6 9NG: not on the flood risk listAL6 9NJ: not on the flood risk listAL6 9NL: not on the flood risk listAL6 9NN: not on the flood risk listAL6 9NP: not on the flood risk listAL6 9NR: not on the flood risk listAL6 9NS: not on the flood risk listAL6 9NW: not on the flood risk listAL6 9NX: not on the flood risk listAL6 9PB: not on the flood risk listAL6 9PD: not on the flood risk listAL6 9PE: not on the flood risk listAL6 9PF: not on the flood risk listAL6 9PH: not on the flood risk listAL6 9PJ: not on the flood risk listAL6 9PL: not on the flood risk listAL6 9PN: not on the flood risk listAL6 9PP: not on the flood risk listAL6 9PQ: not on the flood risk listAL6 9PR: not on the flood risk listAL6 9PS: not on the flood risk listAL6 9PT: not on the flood risk listAL6 9PU: not on the flood risk listAL6 9PW: not on the flood risk listAL6 9PX: not on the flood risk listAL6 9PY: not on the flood risk listAL6 9PZ: not on the flood risk listAL6 9QB: not on the flood risk listAL6 9QD: not on the flood risk listAL6 9QE: not on the flood risk listAL6 9RA: not on the flood risk listAL6 9RB: not on the flood risk listAL6 9RD: not on the flood risk listAL6 9RE: not on the flood risk listAL6 9RF: not on the flood risk listAL6 9RH: not on the flood risk listAL6 9RJ: not on the flood risk listAL6 9RL: not on the flood risk listAL6 9RN: not on the flood risk listAL6 9RP: not on the flood risk listAL6 9RQ: not on the flood risk listAL6 9RR: not on the flood risk listAL6 9RS: not on the flood risk listAL6 9RW: not on the flood risk listAL6 9SA: not on the flood risk listAL6 9SB: not on the flood risk listAL6 9SD: not on the flood risk listAL6 9SE: not on the flood risk listAL6 9SF: not on the flood risk listAL6 9SG: not on the flood risk listAL6 9SH: not on the flood risk listAL6 9SJ: not on the flood risk listAL6 9SN: not on the flood risk listAL6 9SP: not on the flood risk listAL6 9SQ: not on the flood risk listAL6 9SS: not on the flood risk listAL6 9ST: not on the flood risk listAL6 9SU: not on the flood risk listAL6 9SW: not on the flood risk listAL6 9SX: not on the flood risk listAL6 9SY: not on the flood risk listAL6 9SZ: not on the flood risk listAL6 9TA: not on the flood risk listAL6 9TB: not on the flood risk listAL6 9TD: not on the flood risk listAL6 9TE: not on the flood risk listAL6 9TF: not on the flood risk listAL6 9TG: not on the flood risk listAL6 9TJ: not on the flood risk listAL6 9TP: not on the flood risk listAL6 9TQ: not on the flood risk listAL6 9TR: not on the flood risk listAL6 9TS: not on the flood risk listAL6 9TT: not on the flood risk listAL6 9TU: not on the flood risk listAL6 9TX: not on the flood risk listAL6 9TY: not on the flood risk listAL6 9UA: not on the flood risk listAL6 9UB: not on the flood risk listAL6 9UD: not on the flood risk listAL6 9UE: not on the flood risk listAL6 9UF: not on the flood risk listAL6 9UG: not on the flood risk listAL6 9UH: not on the flood risk listAL6 9UJ: not on the flood risk listAL6 9UN: not on the flood risk listAL6 9UQ: not on the flood risk listAL6 0BX: low flood risk at worstAL6 0JQ: low flood risk at worstAL6 0SW: low flood risk at worstAL6 9EA: low flood risk at worstAL6 9EF: low flood risk at worstAL6 9ET: low flood risk at worstAL6 9EU: low flood risk at worstAL6 9EX: low flood risk at worstAL6 9GS: low flood risk at worstAL6 9NU: low flood risk at worstAL6 9NH: medium flood risk at worstAL6 9NQ: medium flood risk at worstAL6 9EQ: high flood risk Woolmer GreenWelwynCodicote Map of every postcode in AL6, by flood risk Of the 506 postcodes in AL6 that ONS places, 1 have a home or business at high risk, 2 are at medium risk at worst, 12 are at low risk at worst and 491 are not on the Environment Agency's at-risk list. Places named: Woolmer Green, Welwyn, Codicote. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. Woolmer GreenWelwynCodicote
  • A home or business at high risk: 1
  • At medium risk at worst: 2
  • At low risk at worst: 12
  • At very low risk only: 0
  • Not on the at-risk list: 491

Of the 506 postcodes in AL6 that ONS places, 1 have a home or business at high risk, 2 are at medium risk at worst, 12 are at low risk at worst and 491 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.

The middle of its postcodes: latitude 51.8322, longitude -0.1998. 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; 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.

AL6 9EQ2 at high risk

What broadband can you get in AL6?

Ofcom reports on 501 of the 506 postcodes in AL6. At 303 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit303 of 501
Postcodes where every home can get superfast449 of 501

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 AL6 at risk of flooding?

15 of the 506 postcodes in AL6 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 5 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 15 of 506 postcodes High: 2Medium: 3Low: 49

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 AL6?

Homes in AL6 sold for a typical £700,000 in the 12 months to August 2026, across 113 sales, down 5.3% on the 12 months before, HM Land Registry's figures show.

£700,000 typical price, the 12 months to August 2026
12 months to August 2025
£739,500
12 months to August 2026
£700,000

▼ down 5.3% on the 12 months before

Detached£875,500 58 sales
Semi-detached£615,000 26 sales
Terraced£465,000 21 sales
Flat or maisonette£276,500 8 sales

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 AL6

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

AL6 0265 postcodesAL6 9241 postcodes
UK postcode format explained

Places in AL6

Towns and villages with postcodes in AL6, and how many each has here.

Woolmer Green postcodes,159Welwyn postcodes,141Welwyn Garden City postcodes,62

Who covers AL6

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

  • Welwyn Hatfield391
  • North East Hertfordshire64
  • Stevenage49
  • Harpenden and Berkhamsted2

Police force areas

  • Hertfordshire506

Next to AL6

AL5 postcode district AL7 postcode district All AL districts Woolmer Green postcodes

"Next to" is by number: the districts before and after AL6 in the AL area.

Check a postcode

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