HP1 postcode district: Hemel Hempstead and around, Hertfordshire

HP1 is a postcode district in Hertfordshire, with 681 postcodes in use in 4 sectors. It has postcodes in Hemel Hempstead. Its council is Dacorum.

Postcodes in use
681
Sectors
4
Council
Dacorum
Places
Hemel Hempstead

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

Every postcode in HP1, by flood risk

Map of every postcode in HP1, by flood risk Of the 681 postcodes in HP1 that ONS places, 7 have a home or business at high risk, 2 are at medium risk at worst, 4 are at low risk at worst and 668 are not on the Environment Agency's at-risk list. 5 postcodes lie beyond the edge and are listed under the map. Places named: Hemel Hempstead. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A41A4147 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 1AQ: not on the flood risk listHP1 1AS: 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 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 1ER: not on the flood risk listHP1 1ES: not on the flood risk listHP1 1ET: not on the flood risk listHP1 1EX: not on the flood risk listHP1 1EZ: not on the flood risk listHP1 1FW: 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 1GW: 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 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 1LE: not on the flood risk listHP1 1LF: 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 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 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 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 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 2AA: not on the flood risk listHP1 2AB: not on the flood risk listHP1 2AD: not on the flood risk listHP1 2AE: not on the flood risk listHP1 2AF: not on the flood risk listHP1 2AG: not on the flood risk listHP1 2AH: not on the flood risk listHP1 2AJ: not on the flood risk listHP1 2AL: not on the flood risk listHP1 2AN: not on the flood risk listHP1 2AP: not on the flood risk listHP1 2AQ: not on the flood risk listHP1 2AR: not on the flood risk listHP1 2AS: not on the flood risk listHP1 2AT: not on the flood risk listHP1 2AU: not on the flood risk listHP1 2AX: not on the flood risk listHP1 2AY: not on the flood risk listHP1 2AZ: not on the flood risk listHP1 2BA: not on the flood risk listHP1 2BB: not on the flood risk listHP1 2BD: not on the flood risk listHP1 2BE: not on the flood risk listHP1 2BG: not on the flood risk listHP1 2BH: not on the flood risk listHP1 2BJ: not on the flood risk listHP1 2BP: not on the flood risk listHP1 2BQ: not on the flood risk listHP1 2BS: not on the flood risk listHP1 2BT: not on the flood risk listHP1 2BU: not on the flood risk listHP1 2BW: not on the flood risk listHP1 2BX: not on the flood risk listHP1 2BY: not on the flood risk listHP1 2BZ: not on the flood risk listHP1 2DB: not on the flood risk listHP1 2DD: not on the flood risk listHP1 2DE: not on the flood risk listHP1 2DF: not on the flood risk listHP1 2DH: not on the flood risk listHP1 2DJ: not on the flood risk listHP1 2DN: not on the flood risk listHP1 2DQ: not on the flood risk listHP1 2DY: not on the flood risk listHP1 2DZ: not on the flood risk listHP1 2EA: not on the flood risk listHP1 2EF: not on the flood risk listHP1 2EG: not on the flood risk listHP1 2EH: not on the flood risk listHP1 2EL: not on the flood risk listHP1 2EN: not on the flood risk listHP1 2EP: not on the flood risk listHP1 2EQ: not on the flood risk listHP1 2EX: not on the flood risk listHP1 2FF: not on the flood risk listHP1 2FG: not on the flood risk listHP1 2FJ: not on the flood risk listHP1 2FU: not on the flood risk listHP1 2HA: not on the flood risk listHP1 2HB: not on the flood risk listHP1 2HD: not on the flood risk listHP1 2HE: not on the flood risk listHP1 2HF: not on the flood risk listHP1 2HG: not on the flood risk listHP1 2HH: not on the flood risk listHP1 2HJ: not on the flood risk listHP1 2HL: not on the flood risk listHP1 2HN: not on the flood risk listHP1 2HP: not on the flood risk listHP1 2HQ: not on the flood risk listHP1 2HS: not on the flood risk listHP1 2HT: not on the flood risk listHP1 2HU: not on the flood risk listHP1 2HW: not on the flood risk listHP1 2HX: not on the flood risk listHP1 2HY: not on the flood risk listHP1 2HZ: not on the flood risk listHP1 2JA: not on the flood risk listHP1 2JB: not on the flood risk listHP1 2JD: not on the flood risk listHP1 2JE: not on the flood risk listHP1 2JF: not on the flood risk listHP1 2JG: not on the flood risk listHP1 2JH: not on the flood risk listHP1 2JL: not on the flood risk listHP1 2JP: not on the flood risk listHP1 2JQ: not on the flood risk listHP1 2JR: not on the flood risk listHP1 2JT: not on the flood risk listHP1 2JU: not on the flood risk listHP1 2JW: not on the flood risk listHP1 2JX: not on the flood risk listHP1 2LB: not on the flood risk listHP1 2LD: not on the flood risk listHP1 2LF: not on the flood risk listHP1 2LG: not on the flood risk listHP1 2LH: not on the flood risk listHP1 2LJ: not on the flood risk listHP1 2LL: not on the flood risk listHP1 2LN: not on the flood risk listHP1 2LP: not on the flood risk listHP1 2LQ: not on the flood risk listHP1 2LR: not on the flood risk listHP1 2LS: not on the flood risk listHP1 2LT: not on the flood risk listHP1 2LU: not on the flood risk listHP1 2LW: not on the flood risk listHP1 2LX: not on the flood risk listHP1 2LY: not on the flood risk listHP1 2LZ: not on the flood risk listHP1 2NA: not on the flood risk listHP1 2NB: not on the flood risk listHP1 2ND: not on the flood risk listHP1 2NE: not on the flood risk listHP1 2NF: not on the flood risk listHP1 2NG: not on the flood risk listHP1 2NH: not on the flood risk listHP1 2NJ: not on the flood risk listHP1 2NP: not on the flood risk listHP1 2NQ: not on the flood risk listHP1 2NR: not on the flood risk listHP1 2NS: not on the flood risk listHP1 2NT: not on the flood risk listHP1 2NU: not on the flood risk listHP1 2PE: not on the flood risk listHP1 2PF: not on the flood risk listHP1 2PG: not on the flood risk listHP1 2PH: not on the flood risk listHP1 2PJ: not on the flood risk listHP1 2PL: not on the flood risk listHP1 2PN: not on the flood risk listHP1 2PP: not on the flood risk listHP1 2PQ: not on the flood risk listHP1 2PR: not on the flood risk listHP1 2PS: not on the flood risk listHP1 2PT: not on the flood risk listHP1 2PU: not on the flood risk listHP1 2PW: not on the flood risk listHP1 2PX: not on the flood risk listHP1 2PY: not on the flood risk listHP1 2PZ: not on the flood risk listHP1 2QF: not on the flood risk listHP1 2QG: not on the flood risk listHP1 2QH: not on the flood risk listHP1 2QJ: not on the flood risk listHP1 2QL: not on the flood risk listHP1 2QN: not on the flood risk listHP1 2QP: not on the flood risk listHP1 2QR: not on the flood risk listHP1 2QS: not on the flood risk listHP1 2QT: not on the flood risk listHP1 2QU: not on the flood risk listHP1 2QW: not on the flood risk listHP1 2QX: not on the flood risk listHP1 2RA: not on the flood risk listHP1 2RB: not on the flood risk listHP1 2RE: not on the flood risk listHP1 2RF: not on the flood risk listHP1 2RG: not on the flood risk listHP1 2RH: not on the flood risk listHP1 2RN: not on the flood risk listHP1 2RQ: not on the flood risk listHP1 2RS: not on the flood risk listHP1 2RT: not on the flood risk listHP1 2RU: not on the flood risk listHP1 2RY: not on the flood risk listHP1 2SA: not on the flood risk listHP1 2SB: not on the flood risk listHP1 2SD: not on the flood risk listHP1 2SE: not on the flood risk listHP1 2SF: not on the flood risk listHP1 2SG: not on the flood risk listHP1 2SN: not on the flood risk listHP1 2SQ: not on the flood risk listHP1 2TA: not on the flood risk listHP1 2TD: not on the flood risk listHP1 2TE: not on the flood risk listHP1 2TF: not on the flood risk listHP1 2TG: not on the flood risk listHP1 2TH: not on the flood risk listHP1 2TJ: not on the flood risk listHP1 2TL: not on the flood risk listHP1 2TN: not on the flood risk listHP1 2TP: not on the flood risk listHP1 2TQ: not on the flood risk listHP1 2TW: not on the flood risk listHP1 2TY: not on the flood risk listHP1 3AA: not on the flood risk listHP1 3AB: not on the flood risk listHP1 3AD: not on the flood risk listHP1 3AF: not on the flood risk listHP1 3AH: not on the flood risk listHP1 3AL: not on the flood risk listHP1 3AR: not on the flood risk listHP1 3AS: not on the flood risk listHP1 3AT: not on the flood risk listHP1 3AU: not on the flood risk listHP1 3AW: not on the flood risk listHP1 3AX: not on the flood risk listHP1 3BA: not on the flood risk listHP1 3BD: not on the flood risk listHP1 3BG: not on the flood risk listHP1 3BH: not on the flood risk listHP1 3BJ: not on the flood risk listHP1 3BL: not on the flood risk listHP1 3BN: not on the flood risk listHP1 3BS: not on the flood risk listHP1 3BT: not on the flood risk listHP1 3BU: not on the flood risk listHP1 3BW: not on the flood risk listHP1 3BY: not on the flood risk listHP1 3BZ: not on the flood risk listHP1 3DA: not on the flood risk listHP1 3DD: not on the flood risk listHP1 3DF: not on the flood risk listHP1 3DG: not on the flood risk listHP1 3DL: not on the flood risk listHP1 3DN: not on the flood risk listHP1 3DP: not on the flood risk listHP1 3DQ: not on the flood risk listHP1 3DS: not on the flood risk listHP1 3DT: not on the flood risk listHP1 3DU: not on the flood risk listHP1 3DW: not on the flood risk listHP1 3DX: not on the flood risk listHP1 3DY: not on the flood risk listHP1 3DZ: not on the flood risk listHP1 3EA: not on the flood risk listHP1 3EB: not on the flood risk listHP1 3ED: not on the flood risk listHP1 3EE: not on the flood risk listHP1 3EF: not on the flood risk listHP1 3EG: not on the flood risk listHP1 3EH: not on the flood risk listHP1 3EN: not on the flood risk listHP1 3EP: not on the flood risk listHP1 3ER: not on the flood risk listHP1 3ES: not on the flood risk listHP1 3ET: not on the flood risk listHP1 3EU: not on the flood risk listHP1 3EW: not on the flood risk listHP1 3EX: not on the flood risk listHP1 3EY: not on the flood risk listHP1 3FA: not on the flood risk listHP1 3FB: not on the flood risk listHP1 3FD: not on the flood risk listHP1 3HA: not on the flood risk listHP1 3HB: not on the flood risk listHP1 3HD: not on the flood risk listHP1 3HE: not on the flood risk listHP1 3HF: not on the flood risk listHP1 3HH: not on the flood risk listHP1 3HJ: not on the flood risk listHP1 3HP: not on the flood risk listHP1 3HR: not on the flood risk listHP1 3HS: not on the flood risk listHP1 3HT: not on the flood risk listHP1 3HU: not on the flood risk listHP1 3HW: not on the flood risk listHP1 3HX: not on the flood risk listHP1 3HY: not on the flood risk listHP1 3HZ: not on the flood risk listHP1 3JA: not on the flood risk listHP1 3JB: not on the flood risk listHP1 3JD: not on the flood risk listHP1 3JE: not on the flood risk listHP1 3JG: not on the flood risk listHP1 3JH: not on the flood risk listHP1 3JL: not on the flood risk listHP1 3JN: not on the flood risk listHP1 3JP: not on the flood risk listHP1 3JQ: not on the flood risk listHP1 3JS: not on the flood risk listHP1 3JT: not on the flood risk listHP1 3JU: not on the flood risk listHP1 3JW: not on the flood risk listHP1 3JX: not on the flood risk listHP1 3JY: not on the flood risk listHP1 3JZ: not on the flood risk listHP1 3LA: not on the flood risk listHP1 3LB: not on the flood risk listHP1 3LD: not on the flood risk listHP1 3LE: not on the flood risk listHP1 3LF: not on the flood risk listHP1 3LG: not on the flood risk listHP1 3LH: not on the flood risk listHP1 3LL: not on the flood risk listHP1 3LP: not on the flood risk listHP1 3LQ: not on the flood risk listHP1 3LR: not on the flood risk listHP1 3LW: not on the flood risk listHP1 3LY: not on the flood risk listHP1 3LZ: not on the flood risk listHP1 3NA: not on the flood risk listHP1 3NB: not on the flood risk listHP1 3ND: not on the flood risk listHP1 3NE: not on the flood risk listHP1 3NG: not on the flood risk listHP1 3NH: not on the flood risk listHP1 3NJ: not on the flood risk listHP1 3NL: not on the flood risk listHP1 3NN: not on the flood risk listHP1 3NP: not on the flood risk listHP1 3NQ: not on the flood risk listHP1 3NR: not on the flood risk listHP1 3NS: not on the flood risk listHP1 3NT: not on the flood risk listHP1 3NU: not on the flood risk listHP1 3NW: not on the flood risk listHP1 3NX: not on the flood risk listHP1 3NY: not on the flood risk listHP1 3NZ: not on the flood risk listHP1 3PA: not on the flood risk listHP1 3PB: not on the flood risk listHP1 3PD: not on the flood risk listHP1 3PE: not on the flood risk listHP1 3PH: not on the flood risk listHP1 3PJ: not on the flood risk listHP1 3PL: not on the flood risk listHP1 3PN: not on the flood risk listHP1 3PP: not on the flood risk listHP1 3PR: not on the flood risk listHP1 3PS: not on the flood risk listHP1 3PT: not on the flood risk listHP1 3PX: not on the flood risk listHP1 3PY: not on the flood risk listHP1 3PZ: not on the flood risk listHP1 3QA: not on the flood risk listHP1 3QB: not on the flood risk listHP1 3QD: not on the flood risk listHP1 3QF: not on the flood risk listHP1 3QG: not on the flood risk listHP1 3QH: not on the flood risk listHP1 3QJ: not on the flood risk listHP1 3QL: not on the flood risk listHP1 3QN: not on the flood risk listHP1 3QP: not on the flood risk listHP1 3QQ: not on the flood risk listHP1 3QR: not on the flood risk listHP1 3QS: not on the flood risk listHP1 3QT: not on the flood risk listHP1 3QU: not on the flood risk listHP1 3QW: not on the flood risk listHP1 3QX: not on the flood risk listHP1 3QY: not on the flood risk listHP1 3QZ: not on the flood risk listHP1 3RA: not on the flood risk listHP1 3RB: not on the flood risk listHP1 3RD: not on the flood risk listHP1 3RF: not on the flood risk listHP1 3RG: not on the flood risk listHP1 3RJ: not on the flood risk listHP1 3RL: not on the flood risk listHP1 3RN: not on the flood risk listHP1 3RP: not on the flood risk listHP1 3RQ: not on the flood risk listHP1 3RR: not on the flood risk listHP1 3RS: not on the flood risk listHP1 3RT: not on the flood risk listHP1 3RW: not on the flood risk listHP1 3SD: not on the flood risk listHP1 3SE: not on the flood risk listHP1 3SF: not on the flood risk listHP1 3SG: not on the flood risk listHP1 3SL: not on the flood risk listHP1 3TR: not on the flood risk listHP1 3TU: not on the flood risk listHP1 9ZY: not on the flood risk listHP1 1BZ: low flood risk at worstHP1 2BN: low flood risk at worstHP1 3AQ: low flood risk at worstHP1 3BB: low flood risk at worstHP1 1DH: medium flood risk at worstHP1 1LS: medium flood risk at worstHP1 1NA: high flood riskHP1 1NE: high flood riskHP1 2BL: high flood riskHP1 2RJ: high flood riskHP1 2RL: high flood riskHP1 2RX: high flood riskHP1 2RZ: high flood risk Hemel Hempstead Map of every postcode in HP1, by flood risk Of the 681 postcodes in HP1 that ONS places, 7 have a home or business at high risk, 2 are at medium risk at worst, 4 are at low risk at worst and 668 are not on the Environment Agency's at-risk list. 5 postcodes lie beyond the edge and are listed under the map. Places named: Hemel Hempstead. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A4147 Hemel Hempstead
  • A home or business at high risk: 7
  • At medium risk at worst: 2
  • At low risk at worst: 4
  • At very low risk only: 0
  • Not on the at-risk list: 668

Of the 681 postcodes in HP1 that ONS places, 7 have a home or business at high risk, 2 are at medium risk at worst, 4 are at low risk at worst and 668 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 51.7564, longitude -0.4882. 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.

HP1 2RZ7 at high riskHP1 2RJ4 at high riskHP1 1NA2 at high riskHP1 1NE2 at high riskHP1 2BL1 at high riskHP1 2RL1 at high riskHP1 2RX1 at high risk

5 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.

HP1 2RPHP1 2RRHP1 3BPHP1 3DBHP1 3DE

What broadband can you get in HP1?

Ofcom reports on 622 of the 681 postcodes in HP1. At 509 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit509 of 622
Postcodes where every home can get superfast564 of 622

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 HP1 at risk of flooding?

13 of the 681 postcodes in HP1 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 23 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 13 of 681 postcodes High: 18Medium: 5Low: 9Very low: 11

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 HP1?

Homes in HP1 sold for a typical £416,532 in the 12 months to August 2026, across 283 sales, down 2% on the 12 months before, HM Land Registry's figures show.

£416,532 typical price, the 12 months to August 2026
12 months to August 2025
£425,000
12 months to August 2026
£416,532

▼ down 2% on the 12 months before

Detached£685,000 36 sales
Semi-detached£515,000 56 sales
Terraced£410,000 138 sales
Flat or maisonette£265,000 53 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 HP1

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

HP1 1234 postcodesHP1 2207 postcodesHP1 3200 postcodesHP1 940 postcodes
UK postcode format explained

Places in HP1

Towns and villages with postcodes in HP1, and how many each has here.

Hemel Hempstead postcodes,633

Who covers HP1

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

  • Hemel Hempstead656
  • Harpenden and Berkhamsted25

Police force areas

  • Hertfordshire681

Next to HP1

HP2 postcode district All HP districts Hemel Hempstead postcodes

"Next to" is by number: the district after HP1 in the HP area.

Check a postcode

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