HP1 1 postcode sector in the HP1 district

HP1 1 is a sector of the HP1 district: every postcode that starts HP1 1. It has 234 postcodes in use, 10 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 HP1 1 sector, by flood risk

Map of every postcode in the HP1 1 sector, by flood risk Of the 234 postcodes in the HP1 1 sector that ONS places, 2 have a home or business at high risk, 2 are at medium risk at worst, 1 are at low risk at worst and 229 are not on the Environment Agency's at-risk list. One postcode lies beyond the edge and is listed under the map. Places named: Boxmoor, Hemel Hempstead Town. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A414 HP1 1AB: not on the flood risk listHP1 1AE: not on the flood risk listHP1 1AF: not on the flood risk listHP1 1AG: not on the flood risk listHP1 1AH: not on the flood risk listHP1 1AJ: not on the flood risk listHP1 1AL: not on the flood risk listHP1 1AN: not on the flood risk listHP1 1AP: not on the flood risk listHP1 1AQ: not on the flood risk listHP1 1AS: not on the flood risk listHP1 1AT: not on the flood risk listHP1 1AU: not on the flood risk listHP1 1AW: not on the flood risk listHP1 1BA: not on the flood risk listHP1 1BB: not on the flood risk listHP1 1BE: not on the flood risk listHP1 1BF: not on the flood risk listHP1 1BH: not on the flood risk listHP1 1BJ: not on the flood risk listHP1 1BL: not on the flood risk listHP1 1BN: not on the flood risk listHP1 1BT: not on the flood risk listHP1 1BW: not on the flood risk listHP1 1BX: not on the flood risk listHP1 1DA: not on the flood risk listHP1 1DN: not on the flood risk listHP1 1DP: not on the flood risk listHP1 1DR: not on the flood risk listHP1 1DS: not on the flood risk listHP1 1DU: not on the flood risk listHP1 1DX: not on the flood risk listHP1 1DY: not on the flood risk listHP1 1DZ: not on the flood risk listHP1 1EA: not on the flood risk listHP1 1EB: not on the flood risk listHP1 1ED: not on the flood risk listHP1 1EF: not on the flood risk listHP1 1EG: not on the flood risk listHP1 1EH: not on the flood risk listHP1 1EL: not on the flood risk listHP1 1EP: not on the flood risk listHP1 1EQ: not on the flood risk listHP1 1ER: not on the flood risk listHP1 1ES: not on the flood risk listHP1 1ET: not on the flood risk listHP1 1EU: not on the flood risk listHP1 1EX: not on the flood risk listHP1 1EZ: not on the flood risk listHP1 1FU: not on the flood risk listHP1 1FZ: not on the flood risk listHP1 1GF: not on the flood risk listHP1 1GG: not on the flood risk listHP1 1GH: not on the flood risk listHP1 1GN: not on the flood risk listHP1 1GQ: not on the flood risk listHP1 1HD: not on the flood risk listHP1 1HG: not on the flood risk listHP1 1HL: not on the flood risk listHP1 1HN: not on the flood risk listHP1 1HP: not on the flood risk listHP1 1HT: not on the flood risk listHP1 1HU: not on the flood risk listHP1 1HW: not on the flood risk listHP1 1HX: not on the flood risk listHP1 1HY: not on the flood risk listHP1 1HZ: not on the flood risk listHP1 1JA: not on the flood risk listHP1 1JB: not on the flood risk listHP1 1JD: not on the flood risk listHP1 1JE: not on the flood risk listHP1 1JF: not on the flood risk listHP1 1JG: not on the flood risk listHP1 1JH: not on the flood risk listHP1 1JJ: not on the flood risk listHP1 1JL: not on the flood risk listHP1 1JN: not on the flood risk listHP1 1JP: not on the flood risk listHP1 1JQ: not on the flood risk listHP1 1JR: not on the flood risk listHP1 1JS: not on the flood risk listHP1 1JT: not on the flood risk listHP1 1JW: not on the flood risk listHP1 1JY: not on the flood risk listHP1 1LA: not on the flood risk listHP1 1LB: not on the flood risk listHP1 1LD: not on the flood risk listHP1 1LE: not on the flood risk listHP1 1LF: not on the flood risk listHP1 1LN: not on the flood risk listHP1 1LR: not on the flood risk listHP1 1LY: not on the flood risk listHP1 1NB: not on the flood risk listHP1 1ND: not on the flood risk listHP1 1NF: not on the flood risk listHP1 1NG: not on the flood risk listHP1 1NH: not on the flood risk listHP1 1NJ: not on the flood risk listHP1 1NP: not on the flood risk listHP1 1NQ: not on the flood risk listHP1 1NR: not on the flood risk listHP1 1NS: not on the flood risk listHP1 1NT: not on the flood risk listHP1 1NU: not on the flood risk listHP1 1NW: not on the flood risk listHP1 1NX: not on the flood risk listHP1 1NY: not on the flood risk listHP1 1NZ: not on the flood risk listHP1 1PA: not on the flood risk listHP1 1PB: not on the flood risk listHP1 1PD: not on the flood risk listHP1 1PE: not on the flood risk listHP1 1PF: not on the flood risk listHP1 1PG: not on the flood risk listHP1 1PH: not on the flood risk listHP1 1PJ: not on the flood risk listHP1 1PL: not on the flood risk listHP1 1PN: not on the flood risk listHP1 1PP: not on the flood risk listHP1 1PQ: not on the flood risk listHP1 1PR: not on the flood risk listHP1 1PW: not on the flood risk listHP1 1PX: not on the flood risk listHP1 1PY: not on the flood risk listHP1 1PZ: not on the flood risk listHP1 1QA: not on the flood risk listHP1 1QB: not on the flood risk listHP1 1QD: not on the flood risk listHP1 1QE: not on the flood risk listHP1 1QF: not on the flood risk listHP1 1QG: not on the flood risk listHP1 1QH: not on the flood risk listHP1 1QJ: not on the flood risk listHP1 1QL: not on the flood risk listHP1 1QN: not on the flood risk listHP1 1QP: not on the flood risk listHP1 1QQ: not on the flood risk listHP1 1QR: not on the flood risk listHP1 1QS: not on the flood risk listHP1 1QT: not on the flood risk listHP1 1QU: not on the flood risk listHP1 1QW: not on the flood risk listHP1 1QX: not on the flood risk listHP1 1QY: not on the flood risk listHP1 1QZ: not on the flood risk listHP1 1RA: not on the flood risk listHP1 1RB: not on the flood risk listHP1 1RD: not on the flood risk listHP1 1RF: not on the flood risk listHP1 1RG: not on the flood risk listHP1 1RH: not on the flood risk listHP1 1RJ: not on the flood risk listHP1 1RL: not on the flood risk listHP1 1RN: not on the flood risk listHP1 1RP: not on the flood risk listHP1 1RQ: not on the flood risk listHP1 1RR: not on the flood risk listHP1 1RS: not on the flood risk listHP1 1RT: not on the flood risk listHP1 1RU: not on the flood risk listHP1 1RW: not on the flood risk listHP1 1RX: not on the flood risk listHP1 1RY: not on the flood risk listHP1 1RZ: not on the flood risk listHP1 1SA: not on the flood risk listHP1 1SB: not on the flood risk listHP1 1SD: not on the flood risk listHP1 1SE: not on the flood risk listHP1 1SF: not on the flood risk listHP1 1SG: not on the flood risk listHP1 1SH: not on the flood risk listHP1 1SL: not on the flood risk listHP1 1SN: not on the flood risk listHP1 1SP: not on the flood risk listHP1 1SQ: not on the flood risk listHP1 1SR: not on the flood risk listHP1 1SS: not on the flood risk listHP1 1ST: not on the flood risk listHP1 1SU: not on the flood risk listHP1 1SW: not on the flood risk listHP1 1SX: not on the flood risk listHP1 1SY: not on the flood risk listHP1 1SZ: not on the flood risk listHP1 1TA: not on the flood risk listHP1 1TB: not on the flood risk listHP1 1TD: not on the flood risk listHP1 1TE: not on the flood risk listHP1 1TF: not on the flood risk listHP1 1TG: not on the flood risk listHP1 1TH: not on the flood risk listHP1 1TJ: not on the flood risk listHP1 1TL: not on the flood risk listHP1 1TN: not on the flood risk listHP1 1TP: not on the flood risk listHP1 1TQ: not on the flood risk listHP1 1TR: not on the flood risk listHP1 1TS: not on the flood risk listHP1 1TT: not on the flood risk listHP1 1TU: not on the flood risk listHP1 1TW: not on the flood risk listHP1 1TX: not on the flood risk listHP1 1TY: not on the flood risk listHP1 1TZ: not on the flood risk listHP1 1UA: not on the flood risk listHP1 1UB: not on the flood risk listHP1 1UE: not on the flood risk listHP1 1UF: not on the flood risk listHP1 1UH: not on the flood risk listHP1 1UL: not on the flood risk listHP1 1US: not on the flood risk listHP1 1UY: not on the flood risk listHP1 1WX: not on the flood risk listHP1 1XA: not on the flood risk listHP1 1XB: not on the flood risk listHP1 1XD: not on the flood risk listHP1 1XF: not on the flood risk listHP1 1XG: not on the flood risk listHP1 1XH: not on the flood risk listHP1 1XP: not on the flood risk listHP1 1XQ: not on the flood risk listHP1 1XS: not on the flood risk listHP1 1BZ: low flood risk at worstHP1 1DH: medium flood risk at worstHP1 1LS: medium flood risk at worstHP1 1NA: high flood riskHP1 1NE: high flood risk BoxmoorHemel Hempstead Town Map of every postcode in the HP1 1 sector, by flood risk Of the 234 postcodes in the HP1 1 sector that ONS places, 2 have a home or business at high risk, 2 are at medium risk at worst, 1 are at low risk at worst and 229 are not on the Environment Agency's at-risk list. One postcode lies beyond the edge and is listed under the map. Places named: Boxmoor, Hemel Hempstead Town. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. BoxmoorHemel Hempstead Town
  • A home or business at high risk: 2
  • At medium risk at worst: 2
  • At low risk at worst: 1
  • At very low risk only: 0
  • Not on the at-risk list: 229

Of the 234 postcodes in the HP1 1 sector that ONS places, 2 have a home or business at high risk, 2 are at medium risk at worst, 1 are at low risk at worst and 229 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

The postcodes at high risk

Beside each: how many of its homes and businesses the Environment Agency puts at that risk.

HP1 1NA2 at high riskHP1 1NE2 at high risk

Further out, not drawn

This postcode lies well apart from the rest, so the map is drawn without it to show the rest closer; it is in every count.

HP1 1GW

What do homes sell for in HP1 1?

Homes in HP1 1 sold for a typical £460,000 in the 12 months to August 2026, across 96 sales, up 4.2% on the 12 months before, HM Land Registry's figures show.

£460,000 typical price, the 12 months to August 2026
£441,250 12 months to August 2025
▲ up 4.2% on the 12 months before
  • Detached £710,000 23 sales
  • Semi-detached £550,000 17 sales
  • Terraced £445,000 26 sales
  • Flat or maisonette £270,000 30 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 HP1 1. 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 HP1 1

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.

HP1 1ABHP1 1AEHP1 1AFHP1 1AGHP1 1AHHP1 1AJHP1 1ALHP1 1ANHP1 1APHP1 1AQHP1 1ASHP1 1ATHP1 1AUHP1 1AWHP1 1AXHP1 1AZHP1 1BAHP1 1BBHP1 1BEHP1 1BFHP1 1BGHP1 1BHHP1 1BJHP1 1BLHP1 1BNHP1 1BTHP1 1BWHP1 1BXHP1 1BZHP1 1DAHP1 1DHHP1 1DNHP1 1DPHP1 1DRHP1 1DSHP1 1DUHP1 1DXHP1 1DYHP1 1DZHP1 1EAHP1 1EBHP1 1EDHP1 1EFHP1 1EGHP1 1EHHP1 1ELHP1 1EPHP1 1EQHP1 1ERHP1 1ESHP1 1ETHP1 1EUHP1 1EWHP1 1EXHP1 1EZHP1 1FUHP1 1FWHP1 1FZHP1 1GFHP1 1GGHP1 1GHHP1 1GNHP1 1GQHP1 1GWHP1 1HDHP1 1HGHP1 1HLHP1 1HNHP1 1HPHP1 1HTHP1 1HUHP1 1HWHP1 1HXHP1 1HYHP1 1HZHP1 1JAHP1 1JBHP1 1JDHP1 1JEHP1 1JFHP1 1JGHP1 1JHHP1 1JJHP1 1JLHP1 1JNHP1 1JPHP1 1JQHP1 1JRHP1 1JSHP1 1JTHP1 1JWHP1 1JYHP1 1JZHP1 1LAHP1 1LBHP1 1LDHP1 1LEHP1 1LFHP1 1LNHP1 1LRHP1 1LSHP1 1LYHP1 1NAHP1 1NBHP1 1NDHP1 1NEHP1 1NFHP1 1NGHP1 1NHHP1 1NJHP1 1NPHP1 1NQHP1 1NRHP1 1NSHP1 1NTHP1 1NUHP1 1NWHP1 1NXHP1 1NYHP1 1NZHP1 1PAHP1 1PBHP1 1PDHP1 1PEHP1 1PFHP1 1PGHP1 1PHHP1 1PJHP1 1PLHP1 1PNHP1 1PPHP1 1PQHP1 1PRHP1 1PWHP1 1PXHP1 1PYHP1 1PZHP1 1QAHP1 1QBHP1 1QDHP1 1QEHP1 1QFHP1 1QGHP1 1QHHP1 1QJHP1 1QLHP1 1QNHP1 1QPHP1 1QQHP1 1QRHP1 1QSHP1 1QTHP1 1QUHP1 1QWHP1 1QXHP1 1QYHP1 1QZHP1 1RAHP1 1RBHP1 1RDHP1 1RFHP1 1RGHP1 1RHHP1 1RJHP1 1RLHP1 1RNHP1 1RPHP1 1RQHP1 1RRHP1 1RSHP1 1RTHP1 1RUHP1 1RWHP1 1RXHP1 1RYHP1 1RZHP1 1SAHP1 1SBHP1 1SDHP1 1SEHP1 1SFHP1 1SGHP1 1SHHP1 1SJHP1 1SLHP1 1SNHP1 1SPHP1 1SQHP1 1SRHP1 1SSHP1 1STHP1 1SUHP1 1SWHP1 1SXHP1 1SYHP1 1SZHP1 1TAHP1 1TBHP1 1TDHP1 1TEHP1 1TFHP1 1TGHP1 1THHP1 1TJHP1 1TLHP1 1TNHP1 1TPHP1 1TQHP1 1TRHP1 1TSHP1 1TTHP1 1TUHP1 1TWHP1 1TXHP1 1TYHP1 1TZHP1 1UAHP1 1UBHP1 1UEHP1 1UFHP1 1UHHP1 1ULHP1 1USHP1 1UYHP1 1WXHP1 1XAHP1 1XBHP1 1XDHP1 1XFHP1 1XGHP1 1XHHP1 1XPHP1 1XQHP1 1XS

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.

Check a postcode

Something wrong on this page? Report an error and we will check it against the source.