HP3 postcode district: Hemel Hempstead and around, Hertfordshire

HP3 is a postcode district in Hertfordshire, with 763 postcodes in use in 3 sectors. It has postcodes in Hemel Hempstead and Bovingdon. It is split between 3 councils: Dacorum (742 postcodes), Three Rivers (18) and St Albans (3).

Postcodes in use
763
Sectors
3
Councils
3 councils
Places
2 places

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

Every postcode in HP3, by flood risk

Map of every postcode in HP3, by flood risk Of the 763 postcodes in HP3 that ONS places, 3 have a home or business at high risk, 16 are at low risk at worst, 23 are at very low risk only and 721 are not on the Environment Agency's at-risk list. Places named: Hemel Hempstead, Abbots Langley and Kings Langley, Bovingdon, Chipperfield. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2 km. A41A4251M25M1 HP3 0AA: not on the flood risk listHP3 0AB: not on the flood risk listHP3 0AD: not on the flood risk listHP3 0AE: not on the flood risk listHP3 0AF: not on the flood risk listHP3 0AG: not on the flood risk listHP3 0AH: not on the flood risk listHP3 0AJ: not on the flood risk listHP3 0AN: not on the flood risk listHP3 0AP: not on the flood risk listHP3 0AQ: not on the flood risk listHP3 0AR: not on the flood risk listHP3 0AS: not on the flood risk listHP3 0AT: not on the flood risk listHP3 0AU: not on the flood risk listHP3 0AW: not on the flood risk listHP3 0AX: not on the flood risk listHP3 0AY: not on the flood risk listHP3 0BA: not on the flood risk listHP3 0BB: not on the flood risk listHP3 0BD: not on the flood risk listHP3 0BE: not on the flood risk listHP3 0BF: not on the flood risk listHP3 0BG: not on the flood risk listHP3 0BJ: not on the flood risk listHP3 0BL: not on the flood risk listHP3 0BN: not on the flood risk listHP3 0BP: not on the flood risk listHP3 0BQ: not on the flood risk listHP3 0BS: not on the flood risk listHP3 0BT: not on the flood risk listHP3 0BU: not on the flood risk listHP3 0BW: not on the flood risk listHP3 0BX: not on the flood risk listHP3 0BY: not on the flood risk listHP3 0BZ: not on the flood risk listHP3 0DA: not on the flood risk listHP3 0DD: not on the flood risk listHP3 0DE: not on the flood risk listHP3 0DF: not on the flood risk listHP3 0DG: not on the flood risk listHP3 0DH: not on the flood risk listHP3 0DJ: not on the flood risk listHP3 0DL: not on the flood risk listHP3 0DN: not on the flood risk listHP3 0DP: not on the flood risk listHP3 0DR: not on the flood risk listHP3 0DS: not on the flood risk listHP3 0DT: not on the flood risk listHP3 0DU: not on the flood risk listHP3 0DW: not on the flood risk listHP3 0DX: not on the flood risk listHP3 0DY: not on the flood risk listHP3 0DZ: not on the flood risk listHP3 0EA: not on the flood risk listHP3 0EB: not on the flood risk listHP3 0EE: not on the flood risk listHP3 0EF: not on the flood risk listHP3 0EG: not on the flood risk listHP3 0EJ: not on the flood risk listHP3 0EN: not on the flood risk listHP3 0EP: not on the flood risk listHP3 0EQ: not on the flood risk listHP3 0ER: not on the flood risk listHP3 0ES: not on the flood risk listHP3 0ET: not on the flood risk listHP3 0EU: not on the flood risk listHP3 0EW: not on the flood risk listHP3 0EY: not on the flood risk listHP3 0FA: not on the flood risk listHP3 0FB: not on the flood risk listHP3 0FH: not on the flood risk listHP3 0FJ: not on the flood risk listHP3 0FP: not on the flood risk listHP3 0FQ: not on the flood risk listHP3 0FT: not on the flood risk listHP3 0FU: not on the flood risk listHP3 0FW: not on the flood risk listHP3 0FX: not on the flood risk listHP3 0FY: not on the flood risk listHP3 0FZ: not on the flood risk listHP3 0GA: not on the flood risk listHP3 0GB: not on the flood risk listHP3 0GE: not on the flood risk listHP3 0GF: not on the flood risk listHP3 0GG: not on the flood risk listHP3 0GH: not on the flood risk listHP3 0GL: not on the flood risk listHP3 0GP: not on the flood risk listHP3 0GQ: not on the flood risk listHP3 0GR: not on the flood risk listHP3 0GS: not on the flood risk listHP3 0GT: not on the flood risk listHP3 0GU: not on the flood risk listHP3 0GW: not on the flood risk listHP3 0GX: not on the flood risk listHP3 0HB: not on the flood risk listHP3 0HD: not on the flood risk listHP3 0HE: not on the flood risk listHP3 0HF: not on the flood risk listHP3 0HG: not on the flood risk listHP3 0HJ: not on the flood risk listHP3 0HL: not on the flood risk listHP3 0HP: not on the flood risk listHP3 0HS: not on the flood risk listHP3 0HT: not on the flood risk listHP3 0HX: not on the flood risk listHP3 0HY: not on the flood risk listHP3 0JA: not on the flood risk listHP3 0JB: not on the flood risk listHP3 0JD: not on the flood risk listHP3 0JE: not on the flood risk listHP3 0JF: not on the flood risk listHP3 0JJ: not on the flood risk listHP3 0JL: not on the flood risk listHP3 0JN: not on the flood risk listHP3 0JR: not on the flood risk listHP3 0JS: not on the flood risk listHP3 0JT: not on the flood risk listHP3 0JU: not on the flood risk listHP3 0JW: not on the flood risk listHP3 0JX: not on the flood risk listHP3 0JY: not on the flood risk listHP3 0JZ: not on the flood risk listHP3 0LA: not on the flood risk listHP3 0LB: not on the flood risk listHP3 0LD: not on the flood risk listHP3 0LE: not on the flood risk listHP3 0LF: not on the flood risk listHP3 0LG: not on the flood risk listHP3 0LH: not on the flood risk listHP3 0LJ: not on the flood risk listHP3 0LL: not on the flood risk listHP3 0LP: not on the flood risk listHP3 0LR: not on the flood risk listHP3 0LS: not on the flood risk listHP3 0LT: not on the flood risk listHP3 0LU: not on the flood risk listHP3 0LW: not on the flood risk listHP3 0LX: not on the flood risk listHP3 0LY: not on the flood risk listHP3 0LZ: not on the flood risk listHP3 0NA: not on the flood risk listHP3 0ND: not on the flood risk listHP3 0NE: not on the flood risk listHP3 0NF: not on the flood risk listHP3 0NG: not on the flood risk listHP3 0NH: not on the flood risk listHP3 0NJ: not on the flood risk listHP3 0NL: not on the flood risk listHP3 0NN: not on the flood risk listHP3 0NP: not on the flood risk listHP3 0NQ: not on the flood risk listHP3 0NW: not on the flood risk listHP3 0NZ: not on the flood risk listHP3 0PA: not on the flood risk listHP3 0PD: not on the flood risk listHP3 0PE: not on the flood risk listHP3 0PF: not on the flood risk listHP3 0PG: not on the flood risk listHP3 0PH: not on the flood risk listHP3 0PJ: not on the flood risk listHP3 0PL: not on the flood risk listHP3 0PP: not on the flood risk listHP3 0PQ: not on the flood risk listHP3 0PR: not on the flood risk listHP3 0PT: not on the flood risk listHP3 0PU: not on the flood risk listHP3 0PW: not on the flood risk listHP3 0PX: not on the flood risk listHP3 0PY: not on the flood risk listHP3 0PZ: not on the flood risk listHP3 0QA: not on the flood risk listHP3 0QB: not on the flood risk listHP3 0QG: not on the flood risk listHP3 0QH: not on the flood risk listHP3 0QJ: not on the flood risk listHP3 0QL: not on the flood risk listHP3 0QN: not on the flood risk listHP3 0QP: not on the flood risk listHP3 0QQ: not on the flood risk listHP3 0QR: not on the flood risk listHP3 0QT: not on the flood risk listHP3 0QW: not on the flood risk listHP3 0RB: not on the flood risk listHP3 0RE: not on the flood risk listHP3 0RF: not on the flood risk listHP3 0RL: not on the flood risk listHP3 0RU: not on the flood risk listHP3 0RX: not on the flood risk listHP3 0RY: not on the flood risk listHP3 0SA: not on the flood risk listHP3 0TA: not on the flood risk listHP3 0TB: not on the flood risk listHP3 0TS: not on the flood risk listHP3 0TY: not on the flood risk listHP3 0UB: not on the flood risk listHP3 0UD: not on the flood risk listHP3 0XA: not on the flood risk listHP3 8AA: not on the flood risk listHP3 8AB: not on the flood risk listHP3 8AD: not on the flood risk listHP3 8AF: not on the flood risk listHP3 8AG: not on the flood risk listHP3 8AH: not on the flood risk listHP3 8AJ: not on the flood risk listHP3 8AL: not on the flood risk listHP3 8AN: not on the flood risk listHP3 8AP: not on the flood risk listHP3 8AQ: not on the flood risk listHP3 8AR: not on the flood risk listHP3 8AU: not on the flood risk listHP3 8AW: not on the flood risk listHP3 8AX: not on the flood risk listHP3 8AZ: not on the flood risk listHP3 8BA: not on the flood risk listHP3 8BB: not on the flood risk listHP3 8BD: not on the flood risk listHP3 8BE: not on the flood risk listHP3 8BH: not on the flood risk listHP3 8BL: not on the flood risk listHP3 8BP: not on the flood risk listHP3 8BQ: not on the flood risk listHP3 8BS: not on the flood risk listHP3 8BT: not on the flood risk listHP3 8BU: not on the flood risk listHP3 8BW: not on the flood risk listHP3 8BX: not on the flood risk listHP3 8BY: not on the flood risk listHP3 8BZ: not on the flood risk listHP3 8DA: not on the flood risk listHP3 8DB: not on the flood risk listHP3 8DD: not on the flood risk listHP3 8DG: not on the flood risk listHP3 8DH: not on the flood risk listHP3 8DJ: not on the flood risk listHP3 8DL: not on the flood risk listHP3 8DN: not on the flood risk listHP3 8DP: not on the flood risk listHP3 8DR: not on the flood risk listHP3 8DS: not on the flood risk listHP3 8DT: not on the flood risk listHP3 8DU: not on the flood risk listHP3 8DW: not on the flood risk listHP3 8DX: not on the flood risk listHP3 8DY: not on the flood risk listHP3 8DZ: not on the flood risk listHP3 8EA: not on the flood risk listHP3 8EB: not on the flood risk listHP3 8EG: not on the flood risk listHP3 8EH: not on the flood risk listHP3 8EN: not on the flood risk listHP3 8EP: not on the flood risk listHP3 8ER: not on the flood risk listHP3 8ES: not on the flood risk listHP3 8ET: not on the flood risk listHP3 8EU: not on the flood risk listHP3 8EW: not on the flood risk listHP3 8EX: not on the flood risk listHP3 8HB: not on the flood risk listHP3 8HD: not on the flood risk listHP3 8HE: not on the flood risk listHP3 8HF: not on the flood risk listHP3 8HG: not on the flood risk listHP3 8HH: not on the flood risk listHP3 8HJ: not on the flood risk listHP3 8HL: not on the flood risk listHP3 8HP: not on the flood risk listHP3 8HS: not on the flood risk listHP3 8HT: not on the flood risk listHP3 8HU: not on the flood risk listHP3 8HW: not on the flood risk listHP3 8HY: not on the flood risk listHP3 8HZ: not on the flood risk listHP3 8JA: not on the flood risk listHP3 8JB: not on the flood risk listHP3 8JD: not on the flood risk listHP3 8JE: not on the flood risk listHP3 8JF: not on the flood risk listHP3 8JG: not on the flood risk listHP3 8JH: not on the flood risk listHP3 8JJ: not on the flood risk listHP3 8JL: not on the flood risk listHP3 8JN: not on the flood risk listHP3 8JQ: not on the flood risk listHP3 8JR: not on the flood risk listHP3 8JS: not on the flood risk listHP3 8JU: not on the flood risk listHP3 8LA: not on the flood risk listHP3 8LB: not on the flood risk listHP3 8LE: not on the flood risk listHP3 8LF: not on the flood risk listHP3 8LH: not on the flood risk listHP3 8LJ: not on the flood risk listHP3 8LL: not on the flood risk listHP3 8LN: not on the flood risk listHP3 8LP: not on the flood risk listHP3 8LQ: not on the flood risk listHP3 8LU: not on the flood risk listHP3 8LW: not on the flood risk listHP3 8LX: not on the flood risk listHP3 8LY: not on the flood risk listHP3 8LZ: not on the flood risk listHP3 8ND: not on the flood risk listHP3 8NE: not on the flood risk listHP3 8NF: not on the flood risk listHP3 8NG: not on the flood risk listHP3 8NH: not on the flood risk listHP3 8NN: not on the flood risk listHP3 8NP: not on the flood risk listHP3 8NQ: not on the flood risk listHP3 8NR: not on the flood risk listHP3 8NS: not on the flood risk listHP3 8NT: not on the flood risk listHP3 8NU: not on the flood risk listHP3 8NW: not on the flood risk listHP3 8NX: not on the flood risk listHP3 8NY: not on the flood risk listHP3 8PA: not on the flood risk listHP3 8PB: not on the flood risk listHP3 8PD: not on the flood risk listHP3 8PE: not on the flood risk listHP3 8PG: not on the flood risk listHP3 8PQ: not on the flood risk listHP3 8PR: not on the flood risk listHP3 8PS: not on the flood risk listHP3 8PT: not on the flood risk listHP3 8PU: not on the flood risk listHP3 8PY: not on the flood risk listHP3 8QB: not on the flood risk listHP3 8QD: not on the flood risk listHP3 8QE: not on the flood risk listHP3 8QG: not on the flood risk listHP3 8QH: not on the flood risk listHP3 8QN: not on the flood risk listHP3 8QP: not on the flood risk listHP3 8QR: not on the flood risk listHP3 8QS: not on the flood risk listHP3 8QT: not on the flood risk listHP3 8QU: not on the flood risk listHP3 8QW: not on the flood risk listHP3 8QX: not on the flood risk listHP3 8QY: not on the flood risk listHP3 8QZ: not on the flood risk listHP3 8RB: not on the flood risk listHP3 8RE: not on the flood risk listHP3 8RG: not on the flood risk listHP3 8RL: not on the flood risk listHP3 8RP: not on the flood risk listHP3 8RQ: not on the flood risk listHP3 8RR: not on the flood risk listHP3 8RS: not on the flood risk listHP3 8RU: not on the flood risk listHP3 8RW: not on the flood risk listHP3 8RX: not on the flood risk listHP3 8RY: not on the flood risk listHP3 8RZ: not on the flood risk listHP3 8SA: not on the flood risk listHP3 8SB: not on the flood risk listHP3 8SD: not on the flood risk listHP3 8SE: not on the flood risk listHP3 8SF: not on the flood risk listHP3 8SG: not on the flood risk listHP3 8SH: not on the flood risk listHP3 8SJ: not on the flood risk listHP3 8SL: not on the flood risk listHP3 8SN: not on the flood risk listHP3 8SP: not on the flood risk listHP3 8SQ: not on the flood risk listHP3 8SW: not on the flood risk listHP3 8TA: not on the flood risk listHP3 8TB: not on the flood risk listHP3 8TD: not on the flood risk listHP3 8TE: not on the flood risk listHP3 8TF: not on the flood risk listHP3 8TG: not on the flood risk listHP3 8TH: not on the flood risk listHP3 8TL: not on the flood risk listHP3 8TN: not on the flood risk listHP3 8TP: not on the flood risk listHP3 8TS: not on the flood risk listHP3 8TT: not on the flood risk listHP3 8TU: not on the flood risk listHP3 8TW: not on the flood risk listHP3 8TX: not on the flood risk listHP3 8UB: not on the flood risk listHP3 8UX: not on the flood risk listHP3 9AA: not on the flood risk listHP3 9AE: not on the flood risk listHP3 9AF: not on the flood risk listHP3 9AG: not on the flood risk listHP3 9AH: not on the flood risk listHP3 9AJ: not on the flood risk listHP3 9AL: not on the flood risk listHP3 9AP: not on the flood risk listHP3 9AQ: not on the flood risk listHP3 9AR: not on the flood risk listHP3 9AS: not on the flood risk listHP3 9AU: not on the flood risk listHP3 9AY: not on the flood risk listHP3 9BB: not on the flood risk listHP3 9BD: not on the flood risk listHP3 9BF: not on the flood risk listHP3 9BH: not on the flood risk listHP3 9BJ: not on the flood risk listHP3 9BL: not on the flood risk listHP3 9BN: not on the flood risk listHP3 9BP: not on the flood risk listHP3 9BQ: not on the flood risk listHP3 9BU: not on the flood risk listHP3 9DA: not on the flood risk listHP3 9DE: not on the flood risk listHP3 9DJ: not on the flood risk listHP3 9DN: not on the flood risk listHP3 9DQ: not on the flood risk listHP3 9DX: not on the flood risk listHP3 9DY: not on the flood risk listHP3 9DZ: not on the flood risk listHP3 9EA: not on the flood risk listHP3 9EB: not on the flood risk listHP3 9ED: not on the flood risk listHP3 9EE: not on the flood risk listHP3 9EF: not on the flood risk listHP3 9EG: not on the flood risk listHP3 9EH: not on the flood risk listHP3 9EL: not on the flood risk listHP3 9EN: not on the flood risk listHP3 9ER: not on the flood risk listHP3 9ES: not on the flood risk listHP3 9ET: not on the flood risk listHP3 9EU: not on the flood risk listHP3 9EW: not on the flood risk listHP3 9EX: not on the flood risk listHP3 9EY: not on the flood risk listHP3 9EZ: not on the flood risk listHP3 9FA: not on the flood risk listHP3 9FD: not on the flood risk listHP3 9FE: not on the flood risk listHP3 9FH: not on the flood risk listHP3 9FL: not on the flood risk listHP3 9FR: not on the flood risk listHP3 9FW: not on the flood risk listHP3 9FZ: not on the flood risk listHP3 9GE: not on the flood risk listHP3 9GJ: not on the flood risk listHP3 9GS: not on the flood risk listHP3 9GT: not on the flood risk listHP3 9HA: not on the flood risk listHP3 9HB: not on the flood risk listHP3 9HD: not on the flood risk listHP3 9HE: not on the flood risk listHP3 9HF: not on the flood risk listHP3 9HJ: not on the flood risk listHP3 9HL: not on the flood risk listHP3 9HP: not on the flood risk listHP3 9HQ: not on the flood risk listHP3 9HR: not on the flood risk listHP3 9HS: not on the flood risk listHP3 9HT: not on the flood risk listHP3 9HU: not on the flood risk listHP3 9HW: not on the flood risk listHP3 9HX: not on the flood risk listHP3 9HY: not on the flood risk listHP3 9HZ: not on the flood risk listHP3 9JA: not on the flood risk listHP3 9JB: not on the flood risk listHP3 9JD: not on the flood risk listHP3 9JE: not on the flood risk listHP3 9JF: not on the flood risk listHP3 9JG: not on the flood risk listHP3 9JH: not on the flood risk listHP3 9JJ: not on the flood risk listHP3 9JL: not on the flood risk listHP3 9JP: not on the flood risk listHP3 9JQ: not on the flood risk listHP3 9JT: not on the flood risk listHP3 9JU: not on the flood risk listHP3 9JW: not on the flood risk listHP3 9JX: not on the flood risk listHP3 9JY: not on the flood risk listHP3 9JZ: not on the flood risk listHP3 9LA: not on the flood risk listHP3 9LB: not on the flood risk listHP3 9LD: not on the flood risk listHP3 9LE: not on the flood risk listHP3 9LF: not on the flood risk listHP3 9LG: not on the flood risk listHP3 9LH: not on the flood risk listHP3 9LJ: not on the flood risk listHP3 9LN: not on the flood risk listHP3 9LP: not on the flood risk listHP3 9LQ: not on the flood risk listHP3 9LS: not on the flood risk listHP3 9LT: not on the flood risk listHP3 9LU: not on the flood risk listHP3 9LW: not on the flood risk listHP3 9LY: not on the flood risk listHP3 9NA: not on the flood risk listHP3 9NB: not on the flood risk listHP3 9ND: not on the flood risk listHP3 9NG: not on the flood risk listHP3 9NH: not on the flood risk listHP3 9NJ: not on the flood risk listHP3 9NL: not on the flood risk listHP3 9NN: not on the flood risk listHP3 9NP: not on the flood risk listHP3 9NS: not on the flood risk listHP3 9NT: not on the flood risk listHP3 9NU: not on the flood risk listHP3 9NX: not on the flood risk listHP3 9NY: not on the flood risk listHP3 9NZ: not on the flood risk listHP3 9PA: not on the flood risk listHP3 9PB: not on the flood risk listHP3 9PD: not on the flood risk listHP3 9PE: not on the flood risk listHP3 9PF: not on the flood risk listHP3 9PH: not on the flood risk listHP3 9PJ: not on the flood risk listHP3 9PL: not on the flood risk listHP3 9PN: not on the flood risk listHP3 9PP: not on the flood risk listHP3 9PS: not on the flood risk listHP3 9PT: not on the flood risk listHP3 9PU: not on the flood risk listHP3 9PW: not on the flood risk listHP3 9PX: not on the flood risk listHP3 9PY: not on the flood risk listHP3 9PZ: not on the flood risk listHP3 9QA: not on the flood risk listHP3 9QB: not on the flood risk listHP3 9QD: not on the flood risk listHP3 9QE: not on the flood risk listHP3 9QF: not on the flood risk listHP3 9QG: not on the flood risk listHP3 9QH: not on the flood risk listHP3 9QJ: not on the flood risk listHP3 9QL: not on the flood risk listHP3 9QN: not on the flood risk listHP3 9QP: not on the flood risk listHP3 9QQ: not on the flood risk listHP3 9QT: not on the flood risk listHP3 9QU: not on the flood risk listHP3 9QX: not on the flood risk listHP3 9QZ: not on the flood risk listHP3 9RB: not on the flood risk listHP3 9RE: not on the flood risk listHP3 9RH: not on the flood risk listHP3 9RN: not on the flood risk listHP3 9RS: not on the flood risk listHP3 9RX: not on the flood risk listHP3 9SD: not on the flood risk listHP3 9SF: not on the flood risk listHP3 9SG: not on the flood risk listHP3 9SH: not on the flood risk listHP3 9SJ: not on the flood risk listHP3 9SP: not on the flood risk listHP3 9SQ: not on the flood risk listHP3 9SS: not on the flood risk listHP3 9ST: not on the flood risk listHP3 9SU: not on the flood risk listHP3 9SY: not on the flood risk listHP3 9SZ: not on the flood risk listHP3 9TB: not on the flood risk listHP3 9TD: not on the flood risk listHP3 9TE: not on the flood risk listHP3 9TJ: not on the flood risk listHP3 9TL: not on the flood risk listHP3 9TP: not on the flood risk listHP3 9TR: not on the flood risk listHP3 9TS: not on the flood risk listHP3 9TT: not on the flood risk listHP3 9TU: not on the flood risk listHP3 9TW: not on the flood risk listHP3 9TX: not on the flood risk listHP3 9TY: not on the flood risk listHP3 9TZ: not on the flood risk listHP3 9UA: not on the flood risk listHP3 9UB: not on the flood risk listHP3 9UD: not on the flood risk listHP3 9UE: not on the flood risk listHP3 9UH: not on the flood risk listHP3 9UL: not on the flood risk listHP3 9UN: not on the flood risk listHP3 9UP: not on the flood risk listHP3 9UQ: not on the flood risk listHP3 9UR: not on the flood risk listHP3 9UW: not on the flood risk listHP3 9UY: not on the flood risk listHP3 9UZ: not on the flood risk listHP3 9WA: not on the flood risk listHP3 9WB: not on the flood risk listHP3 9WE: not on the flood risk listHP3 9WG: not on the flood risk listHP3 9WR: not on the flood risk listHP3 9WX: not on the flood risk listHP3 9XA: not on the flood risk listHP3 9XG: not on the flood risk listHP3 9XQ: not on the flood risk listHP3 9XU: not on the flood risk listHP3 9YJ: not on the flood risk listHP3 9DD: very low flood risk onlyHP3 9DG: very low flood risk onlyHP3 9DH: very low flood risk onlyHP3 9DP: very low flood risk onlyHP3 9DR: very low flood risk onlyHP3 9WS: very low flood risk onlyHP3 9FS: very low flood risk onlyHP3 9GA: very low flood risk onlyHP3 9GD: very low flood risk onlyHP3 9GP: very low flood risk onlyHP3 9GU: very low flood risk onlyHP3 9HH: very low flood risk onlyHP3 9TF: very low flood risk onlyHP3 9WN: very low flood risk onlyHP3 9XE: very low flood risk onlyHP3 9GQ: low flood risk at worstHP3 9AW: low flood risk at worstHP3 9BX: low flood risk at worstHP3 9BY: low flood risk at worstHP3 9BZ: low flood risk at worstHP3 9HN: low flood risk at worstHP3 9RF: low flood risk at worstHP3 9RG: low flood risk at worstHP3 9RW: low flood risk at worstHP3 9SA: low flood risk at worstHP3 9SB: low flood risk at worstHP3 9YT: low flood risk at worstHP3 8RT: high flood riskHP3 9FP: high flood riskHP3 9RP: high flood risk Hemel HempsteadAbbots Langley and Kings LangleyBovingdonChipperfield Map of every postcode in HP3, by flood risk Of the 763 postcodes in HP3 that ONS places, 3 have a home or business at high risk, 16 are at low risk at worst, 23 are at very low risk only and 721 are not on the Environment Agency's at-risk list. Places named: Hemel Hempstead, Bovingdon, Chipperfield. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A41M25M1 Hemel HempsteadBovingdonChipperfield
  • A home or business at high risk: 3
  • At medium risk at worst: 0
  • At low risk at worst: 16
  • At very low risk only: 23
  • Not on the at-risk list: 721

Of the 763 postcodes in HP3 that ONS places, 3 have a home or business at high risk, 16 are at low risk at worst, 23 are at very low risk only and 721 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 51.7356, longitude -0.4717. 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.

HP3 9FP15 at high riskHP3 9RP7 at high riskHP3 8RT2 at high risk

What broadband can you get in HP3?

Ofcom reports on 753 of the 763 postcodes in HP3. At 544 of them every home and business can get gigabit broadband, and at 1 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit544 of 753
Postcodes where every home can get superfast692 of 753
Postcodes where some cannot get decent broadband1 of 753

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 HP3 at risk of flooding?

42 of the 763 postcodes in HP3 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 24 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 42 of 763 postcodes High: 24Low: 180Very low: 630

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 HP3?

Homes in HP3 sold for a typical £465,000 in the 12 months to August 2026, across 333 sales, up 6.9% on the 12 months before, HM Land Registry's figures show.

£465,000 typical price, the 12 months to August 2026
£435,000 12 months to August 2025
▲ up 6.9% on the 12 months before
  • Detached £790,000 73 sales
  • Semi-detached £534,500 90 sales
  • Terraced £425,000 85 sales
  • Flat or maisonette £280,000 85 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 HP3

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

HP3 0220 postcodesHP3 8220 postcodesHP3 9323 postcodes
UK postcode format explained

Places in HP3

Towns and villages with postcodes in HP3, and how many each has here.

Hemel Hempstead postcodes,595Bovingdon postcodes,106

Who covers HP3

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 Hempstead730
  • South West Hertfordshire30
  • Harpenden and Berkhamsted3

Police force areas

  • Hertfordshire763

Next to HP3

HP2 postcode district HP4 postcode district All HP districts Hemel Hempstead postcodes

"Next to" is by number: the districts before and after HP3 in the HP area.

Check a postcode

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