HA4 postcode district: Hillingdon and around

HA4 is a postcode district in England, with 1,137 postcodes in use in 6 sectors. It has postcodes in Hillingdon and Harrow. It is split between 2 councils: Hillingdon (1,133 postcodes) and Harrow (4).

Postcodes in use
1,137
Sectors
6
Councils
2 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 HA4, by flood risk

Map of every postcode in HA4, by flood risk Of the 1,137 postcodes in HA4 that ONS places, 46 have a home or business at high risk, 35 are at medium risk at worst, 72 are at low risk at worst and 984 are not on the Environment Agency's at-risk list. 6 groups of postcodes at high or medium risk are outlined: 16 postcodes at high or medium risk; 12 postcodes at high or medium risk; 8 postcodes at high or medium risk; 6 postcodes at high or medium risk; 6 postcodes at high or medium risk; 5 postcodes at high or medium risk. Places named: Ruislip, South Ruislip. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A437 HA4 0AA: not on the flood risk listHA4 0AB: not on the flood risk listHA4 0AG: not on the flood risk listHA4 0AH: not on the flood risk listHA4 0AL: not on the flood risk listHA4 0AN: not on the flood risk listHA4 0AP: not on the flood risk listHA4 0AR: not on the flood risk listHA4 0AS: not on the flood risk listHA4 0AT: not on the flood risk listHA4 0AU: not on the flood risk listHA4 0AW: not on the flood risk listHA4 0AX: not on the flood risk listHA4 0AY: not on the flood risk listHA4 0AZ: not on the flood risk listHA4 0BA: not on the flood risk listHA4 0BB: not on the flood risk listHA4 0BD: not on the flood risk listHA4 0BG: not on the flood risk listHA4 0BH: not on the flood risk listHA4 0BJ: not on the flood risk listHA4 0BN: not on the flood risk listHA4 0BP: not on the flood risk listHA4 0BS: not on the flood risk listHA4 0BT: not on the flood risk listHA4 0BU: not on the flood risk listHA4 0BW: not on the flood risk listHA4 0BX: not on the flood risk listHA4 0BY: not on the flood risk listHA4 0BZ: not on the flood risk listHA4 0DA: not on the flood risk listHA4 0DH: not on the flood risk listHA4 0DJ: not on the flood risk listHA4 0DL: not on the flood risk listHA4 0DN: not on the flood risk listHA4 0DQ: not on the flood risk listHA4 0DT: not on the flood risk listHA4 0DW: not on the flood risk listHA4 0EB: not on the flood risk listHA4 0ED: not on the flood risk listHA4 0EE: not on the flood risk listHA4 0EF: not on the flood risk listHA4 0EG: not on the flood risk listHA4 0EH: not on the flood risk listHA4 0EJ: not on the flood risk listHA4 0EP: not on the flood risk listHA4 0EQ: not on the flood risk listHA4 0ER: not on the flood risk listHA4 0ES: not on the flood risk listHA4 0ET: not on the flood risk listHA4 0EU: not on the flood risk listHA4 0EW: not on the flood risk listHA4 0EX: not on the flood risk listHA4 0EY: not on the flood risk listHA4 0EZ: not on the flood risk listHA4 0FF: not on the flood risk listHA4 0FY: not on the flood risk listHA4 0GD: not on the flood risk listHA4 0GE: not on the flood risk listHA4 0GF: not on the flood risk listHA4 0HB: not on the flood risk listHA4 0HD: not on the flood risk listHA4 0HG: not on the flood risk listHA4 0HH: not on the flood risk listHA4 0HJ: not on the flood risk listHA4 0HL: not on the flood risk listHA4 0HN: not on the flood risk listHA4 0HP: not on the flood risk listHA4 0HR: not on the flood risk listHA4 0HT: not on the flood risk listHA4 0HU: not on the flood risk listHA4 0HW: not on the flood risk listHA4 0HX: not on the flood risk listHA4 0HY: not on the flood risk listHA4 0HZ: not on the flood risk listHA4 0JA: not on the flood risk listHA4 0JD: not on the flood risk listHA4 0JP: not on the flood risk listHA4 0JW: not on the flood risk listHA4 0LU: not on the flood risk listHA4 0LX: not on the flood risk listHA4 0LY: not on the flood risk listHA4 0LZ: not on the flood risk listHA4 0NA: not on the flood risk listHA4 0NB: not on the flood risk listHA4 0ND: not on the flood risk listHA4 0NF: not on the flood risk listHA4 0NG: not on the flood risk listHA4 0NH: not on the flood risk listHA4 0NJ: not on the flood risk listHA4 0NL: not on the flood risk listHA4 0NN: not on the flood risk listHA4 0NQ: not on the flood risk listHA4 0NR: not on the flood risk listHA4 0NS: not on the flood risk listHA4 0NT: not on the flood risk listHA4 0NU: not on the flood risk listHA4 0NW: not on the flood risk listHA4 0PL: not on the flood risk listHA4 0PP: not on the flood risk listHA4 0PS: not on the flood risk listHA4 0PT: not on the flood risk listHA4 0QH: not on the flood risk listHA4 0QS: not on the flood risk listHA4 0QT: not on the flood risk listHA4 0QU: not on the flood risk listHA4 0QX: not on the flood risk listHA4 0QY: not on the flood risk listHA4 0QZ: not on the flood risk listHA4 0RA: not on the flood risk listHA4 0RB: not on the flood risk listHA4 0RD: not on the flood risk listHA4 0RE: not on the flood risk listHA4 0RF: not on the flood risk listHA4 0RG: not on the flood risk listHA4 0RH: not on the flood risk listHA4 0RQ: not on the flood risk listHA4 0RT: not on the flood risk listHA4 0RU: not on the flood risk listHA4 0RX: not on the flood risk listHA4 0RY: not on the flood risk listHA4 0RZ: not on the flood risk listHA4 0SA: not on the flood risk listHA4 0SB: not on the flood risk listHA4 0SD: not on the flood risk listHA4 0SE: not on the flood risk listHA4 0SF: not on the flood risk listHA4 0SG: not on the flood risk listHA4 0SH: not on the flood risk listHA4 0SL: not on the flood risk listHA4 0SN: not on the flood risk listHA4 0SP: not on the flood risk listHA4 0SQ: not on the flood risk listHA4 0SR: not on the flood risk listHA4 0SW: not on the flood risk listHA4 0TA: not on the flood risk listHA4 0TF: not on the flood risk listHA4 0TG: not on the flood risk listHA4 0TH: not on the flood risk listHA4 0TJ: not on the flood risk listHA4 0TL: not on the flood risk listHA4 0TN: not on the flood risk listHA4 0TP: not on the flood risk listHA4 0TQ: not on the flood risk listHA4 0TR: not on the flood risk listHA4 0TS: not on the flood risk listHA4 0TW: not on the flood risk listHA4 0UB: not on the flood risk listHA4 0UD: not on the flood risk listHA4 0UE: not on the flood risk listHA4 0UF: not on the flood risk listHA4 0UG: not on the flood risk listHA4 0UH: not on the flood risk listHA4 0UJ: not on the flood risk listHA4 0UL: not on the flood risk listHA4 0UN: not on the flood risk listHA4 0UP: not on the flood risk listHA4 0UQ: not on the flood risk listHA4 0UR: not on the flood risk listHA4 0UT: not on the flood risk listHA4 0UU: not on the flood risk listHA4 0UW: not on the flood risk listHA4 0UX: not on the flood risk listHA4 0YP: not on the flood risk listHA4 0YS: not on the flood risk listHA4 4DW: not on the flood risk listHA4 6AA: not on the flood risk listHA4 6AB: not on the flood risk listHA4 6AD: not on the flood risk listHA4 6AE: not on the flood risk listHA4 6AF: not on the flood risk listHA4 6AG: not on the flood risk listHA4 6AH: not on the flood risk listHA4 6AJ: not on the flood risk listHA4 6AL: not on the flood risk listHA4 6AN: not on the flood risk listHA4 6AQ: not on the flood risk listHA4 6AS: not on the flood risk listHA4 6AT: not on the flood risk listHA4 6AU: not on the flood risk listHA4 6AW: not on the flood risk listHA4 6AX: not on the flood risk listHA4 6AY: not on the flood risk listHA4 6AZ: not on the flood risk listHA4 6BA: not on the flood risk listHA4 6BB: not on the flood risk listHA4 6BP: not on the flood risk listHA4 6BS: not on the flood risk listHA4 6BT: not on the flood risk listHA4 6BU: not on the flood risk listHA4 6BX: not on the flood risk listHA4 6BY: not on the flood risk listHA4 6BZ: not on the flood risk listHA4 6DA: not on the flood risk listHA4 6DB: not on the flood risk listHA4 6DD: not on the flood risk listHA4 6DE: not on the flood risk listHA4 6DF: not on the flood risk listHA4 6DG: not on the flood risk listHA4 6DH: not on the flood risk listHA4 6DL: not on the flood risk listHA4 6DQ: not on the flood risk listHA4 6DR: not on the flood risk listHA4 6DS: not on the flood risk listHA4 6DT: not on the flood risk listHA4 6DU: not on the flood risk listHA4 6DX: not on the flood risk listHA4 6DZ: not on the flood risk listHA4 6EB: not on the flood risk listHA4 6ED: not on the flood risk listHA4 6EE: not on the flood risk listHA4 6EF: not on the flood risk listHA4 6EG: not on the flood risk listHA4 6EH: not on the flood risk listHA4 6EJ: not on the flood risk listHA4 6EL: not on the flood risk listHA4 6EN: not on the flood risk listHA4 6EQ: not on the flood risk listHA4 6ER: not on the flood risk listHA4 6ES: not on the flood risk listHA4 6ET: not on the flood risk listHA4 6EU: not on the flood risk listHA4 6EW: not on the flood risk listHA4 6EX: not on the flood risk listHA4 6EY: not on the flood risk listHA4 6EZ: not on the flood risk listHA4 6HA: not on the flood risk listHA4 6HB: not on the flood risk listHA4 6HD: not on the flood risk listHA4 6HE: not on the flood risk listHA4 6HF: not on the flood risk listHA4 6HG: not on the flood risk listHA4 6HH: not on the flood risk listHA4 6HJ: not on the flood risk listHA4 6HL: not on the flood risk listHA4 6HN: not on the flood risk listHA4 6HP: not on the flood risk listHA4 6HQ: not on the flood risk listHA4 6HR: not on the flood risk listHA4 6HS: not on the flood risk listHA4 6HW: not on the flood risk listHA4 6JA: not on the flood risk listHA4 6JB: not on the flood risk listHA4 6JE: not on the flood risk listHA4 6JG: not on the flood risk listHA4 6JJ: not on the flood risk listHA4 6JL: not on the flood risk listHA4 6JN: not on the flood risk listHA4 6JP: not on the flood risk listHA4 6JQ: not on the flood risk listHA4 6JR: not on the flood risk listHA4 6JS: not on the flood risk listHA4 6JT: not on the flood risk listHA4 6JU: not on the flood risk listHA4 6JW: not on the flood risk listHA4 6JX: not on the flood risk listHA4 6JY: not on the flood risk listHA4 6LA: not on the flood risk listHA4 6LB: not on the flood risk listHA4 6LD: not on the flood risk listHA4 6LE: not on the flood risk listHA4 6LF: not on the flood risk listHA4 6LG: not on the flood risk listHA4 6LL: not on the flood risk listHA4 6LN: not on the flood risk listHA4 6LQ: not on the flood risk listHA4 6LW: not on the flood risk listHA4 6LZ: not on the flood risk listHA4 6ND: not on the flood risk listHA4 6NJ: not on the flood risk listHA4 6NL: not on the flood risk listHA4 6NN: not on the flood risk listHA4 6NP: not on the flood risk listHA4 6NR: not on the flood risk listHA4 6NS: not on the flood risk listHA4 6NW: not on the flood risk listHA4 6PB: not on the flood risk listHA4 6PD: not on the flood risk listHA4 6PF: not on the flood risk listHA4 6PG: not on the flood risk listHA4 6PH: not on the flood risk listHA4 6PJ: not on the flood risk listHA4 6PL: not on the flood risk listHA4 6PQ: not on the flood risk listHA4 6PY: not on the flood risk listHA4 6QD: not on the flood risk listHA4 6QE: not on the flood risk listHA4 6QG: not on the flood risk listHA4 6QH: not on the flood risk listHA4 6QJ: not on the flood risk listHA4 6QL: not on the flood risk listHA4 6QN: not on the flood risk listHA4 6QP: not on the flood risk listHA4 6QQ: not on the flood risk listHA4 6QR: not on the flood risk listHA4 6QS: not on the flood risk listHA4 6QT: not on the flood risk listHA4 6QW: not on the flood risk listHA4 6QZ: not on the flood risk listHA4 6RA: not on the flood risk listHA4 6RB: not on the flood risk listHA4 6RD: not on the flood risk listHA4 6RE: not on the flood risk listHA4 6RF: not on the flood risk listHA4 6RG: not on the flood risk listHA4 6RJ: not on the flood risk listHA4 6RQ: not on the flood risk listHA4 6RS: not on the flood risk listHA4 6RT: not on the flood risk listHA4 6RU: not on the flood risk listHA4 6RW: not on the flood risk listHA4 6RX: not on the flood risk listHA4 6RY: not on the flood risk listHA4 6RZ: not on the flood risk listHA4 6SA: not on the flood risk listHA4 6SB: not on the flood risk listHA4 6SD: not on the flood risk listHA4 6SE: not on the flood risk listHA4 6SL: not on the flood risk listHA4 6SP: not on the flood risk listHA4 6SR: not on the flood risk listHA4 6SS: not on the flood risk listHA4 6ST: not on the flood risk listHA4 6SU: not on the flood risk listHA4 6SW: not on the flood risk listHA4 6SX: not on the flood risk listHA4 6SY: not on the flood risk listHA4 6SZ: not on the flood risk listHA4 6TA: not on the flood risk listHA4 6TD: not on the flood risk listHA4 6TE: not on the flood risk listHA4 6TF: not on the flood risk listHA4 6TJ: not on the flood risk listHA4 6TP: not on the flood risk listHA4 6TR: not on the flood risk listHA4 6TS: not on the flood risk listHA4 6TT: not on the flood risk listHA4 6TU: not on the flood risk listHA4 6TY: not on the flood risk listHA4 6TZ: not on the flood risk listHA4 6UA: not on the flood risk listHA4 6UB: not on the flood risk listHA4 6UD: not on the flood risk listHA4 6UE: not on the flood risk listHA4 6UF: not on the flood risk listHA4 6UG: not on the flood risk listHA4 6UH: not on the flood risk listHA4 6UJ: not on the flood risk listHA4 6UL: not on the flood risk listHA4 6UN: not on the flood risk listHA4 6UP: not on the flood risk listHA4 6UQ: not on the flood risk listHA4 6UT: not on the flood risk listHA4 6UW: not on the flood risk listHA4 6UX: not on the flood risk listHA4 6UY: not on the flood risk listHA4 6UZ: not on the flood risk listHA4 6XA: not on the flood risk listHA4 6XB: not on the flood risk listHA4 6XD: not on the flood risk listHA4 6XE: not on the flood risk listHA4 7AA: not on the flood risk listHA4 7AB: not on the flood risk listHA4 7AE: not on the flood risk listHA4 7AH: not on the flood risk listHA4 7AJ: not on the flood risk listHA4 7AN: not on the flood risk listHA4 7AQ: not on the flood risk listHA4 7AR: not on the flood risk listHA4 7AU: not on the flood risk listHA4 7AY: not on the flood risk listHA4 7AZ: not on the flood risk listHA4 7BA: not on the flood risk listHA4 7BD: not on the flood risk listHA4 7BH: not on the flood risk listHA4 7BJ: not on the flood risk listHA4 7BP: not on the flood risk listHA4 7BS: not on the flood risk listHA4 7BT: not on the flood risk listHA4 7BU: not on the flood risk listHA4 7BX: not on the flood risk listHA4 7BY: not on the flood risk listHA4 7BZ: not on the flood risk listHA4 7DA: not on the flood risk listHA4 7DB: not on the flood risk listHA4 7DD: not on the flood risk listHA4 7DF: not on the flood risk listHA4 7DG: not on the flood risk listHA4 7DH: not on the flood risk listHA4 7DJ: not on the flood risk listHA4 7DL: not on the flood risk listHA4 7DN: not on the flood risk listHA4 7DP: not on the flood risk listHA4 7DQ: not on the flood risk listHA4 7DR: not on the flood risk listHA4 7DS: not on the flood risk listHA4 7DT: not on the flood risk listHA4 7DU: not on the flood risk listHA4 7DX: not on the flood risk listHA4 7DY: not on the flood risk listHA4 7EA: not on the flood risk listHA4 7EB: not on the flood risk listHA4 7ED: not on the flood risk listHA4 7EF: not on the flood risk listHA4 7EH: not on the flood risk listHA4 7EJ: not on the flood risk listHA4 7EL: not on the flood risk listHA4 7EN: not on the flood risk listHA4 7EP: not on the flood risk listHA4 7EQ: not on the flood risk listHA4 7ER: not on the flood risk listHA4 7ES: not on the flood risk listHA4 7EU: not on the flood risk listHA4 7EW: not on the flood risk listHA4 7EX: not on the flood risk listHA4 7EY: not on the flood risk listHA4 7EZ: not on the flood risk listHA4 7GD: not on the flood risk listHA4 7GE: not on the flood risk listHA4 7GH: not on the flood risk listHA4 7GL: not on the flood risk listHA4 7GN: not on the flood risk listHA4 7HA: not on the flood risk listHA4 7HB: not on the flood risk listHA4 7HD: not on the flood risk listHA4 7HE: not on the flood risk listHA4 7HF: not on the flood risk listHA4 7HG: not on the flood risk listHA4 7HH: not on the flood risk listHA4 7HJ: not on the flood risk listHA4 7HN: not on the flood risk listHA4 7HQ: not on the flood risk listHA4 7HT: not on the flood risk listHA4 7HU: not on the flood risk listHA4 7HX: not on the flood risk listHA4 7HY: not on the flood risk listHA4 7HZ: not on the flood risk listHA4 7JA: not on the flood risk listHA4 7JB: not on the flood risk listHA4 7JD: not on the flood risk listHA4 7JE: not on the flood risk listHA4 7JF: not on the flood risk listHA4 7JG: not on the flood risk listHA4 7JH: not on the flood risk listHA4 7JJ: not on the flood risk listHA4 7JL: not on the flood risk listHA4 7JN: not on the flood risk listHA4 7JP: not on the flood risk listHA4 7JQ: not on the flood risk listHA4 7JW: not on the flood risk listHA4 7JY: not on the flood risk listHA4 7LA: not on the flood risk listHA4 7LB: not on the flood risk listHA4 7LD: not on the flood risk listHA4 7LE: not on the flood risk listHA4 7LF: not on the flood risk listHA4 7LH: not on the flood risk listHA4 7LJ: not on the flood risk listHA4 7LN: not on the flood risk listHA4 7LR: not on the flood risk listHA4 7LS: not on the flood risk listHA4 7LT: not on the flood risk listHA4 7LU: not on the flood risk listHA4 7LX: not on the flood risk listHA4 7LY: not on the flood risk listHA4 7LZ: not on the flood risk listHA4 7NA: not on the flood risk listHA4 7NE: not on the flood risk listHA4 7NF: not on the flood risk listHA4 7NP: not on the flood risk listHA4 7NR: not on the flood risk listHA4 7NS: not on the flood risk listHA4 7NT: not on the flood risk listHA4 7NU: not on the flood risk listHA4 7NX: not on the flood risk listHA4 7NY: not on the flood risk listHA4 7PB: not on the flood risk listHA4 7PE: not on the flood risk listHA4 7PF: not on the flood risk listHA4 7PH: not on the flood risk listHA4 7PN: not on the flood risk listHA4 7PP: not on the flood risk listHA4 7PR: not on the flood risk listHA4 7PS: not on the flood risk listHA4 7PW: not on the flood risk listHA4 7QD: not on the flood risk listHA4 7QL: not on the flood risk listHA4 7QN: not on the flood risk listHA4 7QP: not on the flood risk listHA4 7QR: not on the flood risk listHA4 7QS: not on the flood risk listHA4 7QT: not on the flood risk listHA4 7QU: not on the flood risk listHA4 7QW: not on the flood risk listHA4 7QX: not on the flood risk listHA4 7QZ: not on the flood risk listHA4 7RH: not on the flood risk listHA4 7RJ: not on the flood risk listHA4 7RL: not on the flood risk listHA4 7RN: not on the flood risk listHA4 7RP: not on the flood risk listHA4 7RQ: not on the flood risk listHA4 7RR: not on the flood risk listHA4 7RS: not on the flood risk listHA4 7RT: not on the flood risk listHA4 7RU: not on the flood risk listHA4 7RW: not on the flood risk listHA4 7RX: not on the flood risk listHA4 7RY: not on the flood risk listHA4 7SD: not on the flood risk listHA4 7SJ: not on the flood risk listHA4 7SN: not on the flood risk listHA4 7SP: not on the flood risk listHA4 7SQ: not on the flood risk listHA4 7SR: not on the flood risk listHA4 7SU: not on the flood risk listHA4 7SW: not on the flood risk listHA4 7TB: not on the flood risk listHA4 7TD: not on the flood risk listHA4 7TE: not on the flood risk listHA4 7TF: not on the flood risk listHA4 7TG: not on the flood risk listHA4 7TH: not on the flood risk listHA4 7TN: not on the flood risk listHA4 7TP: not on the flood risk listHA4 7TQ: not on the flood risk listHA4 7TR: not on the flood risk listHA4 7TS: not on the flood risk listHA4 7TT: not on the flood risk listHA4 7TU: not on the flood risk listHA4 7TX: not on the flood risk listHA4 7TZ: not on the flood risk listHA4 7UA: not on the flood risk listHA4 7UB: not on the flood risk listHA4 7UD: not on the flood risk listHA4 7UE: not on the flood risk listHA4 7UG: not on the flood risk listHA4 7UH: not on the flood risk listHA4 7UP: not on the flood risk listHA4 7UQ: not on the flood risk listHA4 7UR: not on the flood risk listHA4 7UU: not on the flood risk listHA4 7UW: not on the flood risk listHA4 7UX: not on the flood risk listHA4 7UY: not on the flood risk listHA4 7XL: not on the flood risk listHA4 7XN: not on the flood risk listHA4 7XP: not on the flood risk listHA4 7XT: not on the flood risk listHA4 7XU: not on the flood risk listHA4 7XW: not on the flood risk listHA4 7YE: not on the flood risk listHA4 7YF: not on the flood risk listHA4 7YG: not on the flood risk listHA4 7YH: not on the flood risk listHA4 7YL: not on the flood risk listHA4 7YN: not on the flood risk listHA4 7YP: not on the flood risk listHA4 7YU: not on the flood risk listHA4 8AJ: not on the flood risk listHA4 8AL: not on the flood risk listHA4 8AN: not on the flood risk listHA4 8AT: not on the flood risk listHA4 8AW: not on the flood risk listHA4 8AX: not on the flood risk listHA4 8AZ: not on the flood risk listHA4 8BD: not on the flood risk listHA4 8BE: not on the flood risk listHA4 8BG: not on the flood risk listHA4 8BH: not on the flood risk listHA4 8BJ: not on the flood risk listHA4 8BL: not on the flood risk listHA4 8BP: not on the flood risk listHA4 8BQ: not on the flood risk listHA4 8BT: not on the flood risk listHA4 8BU: not on the flood risk listHA4 8DG: not on the flood risk listHA4 8DH: not on the flood risk listHA4 8DL: not on the flood risk listHA4 8DN: not on the flood risk listHA4 8DP: not on the flood risk listHA4 8DQ: not on the flood risk listHA4 8DR: not on the flood risk listHA4 8DS: not on the flood risk listHA4 8DT: not on the flood risk listHA4 8DU: not on the flood risk listHA4 8DW: not on the flood risk listHA4 8DX: not on the flood risk listHA4 8DY: not on the flood risk listHA4 8DZ: not on the flood risk listHA4 8EA: not on the flood risk listHA4 8EB: not on the flood risk listHA4 8ED: not on the flood risk listHA4 8EE: not on the flood risk listHA4 8EF: not on the flood risk listHA4 8EG: not on the flood risk listHA4 8EH: not on the flood risk listHA4 8EJ: not on the flood risk listHA4 8EL: not on the flood risk listHA4 8EP: not on the flood risk listHA4 8EQ: not on the flood risk listHA4 8ER: not on the flood risk listHA4 8ES: not on the flood risk listHA4 8ET: not on the flood risk listHA4 8EU: not on the flood risk listHA4 8EW: not on the flood risk listHA4 8EX: not on the flood risk listHA4 8EY: not on the flood risk listHA4 8EZ: not on the flood risk listHA4 8FA: not on the flood risk listHA4 8FB: not on the flood risk listHA4 8FD: not on the flood risk listHA4 8FF: not on the flood risk listHA4 8FG: not on the flood risk listHA4 8FH: not on the flood risk listHA4 8FL: not on the flood risk listHA4 8FN: not on the flood risk listHA4 8FP: not on the flood risk listHA4 8FQ: not on the flood risk listHA4 8FS: not on the flood risk listHA4 8FT: not on the flood risk listHA4 8FU: not on the flood risk listHA4 8FW: not on the flood risk listHA4 8FX: not on the flood risk listHA4 8FY: not on the flood risk listHA4 8FZ: not on the flood risk listHA4 8GA: not on the flood risk listHA4 8GB: not on the flood risk listHA4 8GD: not on the flood risk listHA4 8GE: not on the flood risk listHA4 8GF: not on the flood risk listHA4 8GG: not on the flood risk listHA4 8GH: not on the flood risk listHA4 8GL: not on the flood risk listHA4 8GN: not on the flood risk listHA4 8GR: not on the flood risk listHA4 8GS: not on the flood risk listHA4 8GT: not on the flood risk listHA4 8GW: not on the flood risk listHA4 8GX: not on the flood risk listHA4 8GY: not on the flood risk listHA4 8HA: not on the flood risk listHA4 8HB: not on the flood risk listHA4 8HD: not on the flood risk listHA4 8HE: not on the flood risk listHA4 8HF: not on the flood risk listHA4 8HG: not on the flood risk listHA4 8HJ: not on the flood risk listHA4 8HL: not on the flood risk listHA4 8HP: not on the flood risk listHA4 8HQ: not on the flood risk listHA4 8HR: not on the flood risk listHA4 8HS: not on the flood risk listHA4 8HW: not on the flood risk listHA4 8JB: not on the flood risk listHA4 8JE: not on the flood risk listHA4 8JN: not on the flood risk listHA4 8JR: not on the flood risk listHA4 8JS: not on the flood risk listHA4 8JT: not on the flood risk listHA4 8JU: not on the flood risk listHA4 8JX: not on the flood risk listHA4 8JY: not on the flood risk listHA4 8LB: not on the flood risk listHA4 8LD: not on the flood risk listHA4 8LG: not on the flood risk listHA4 8LL: not on the flood risk listHA4 8LS: not on the flood risk listHA4 8ND: not on the flood risk listHA4 8NE: not on the flood risk listHA4 8NF: not on the flood risk listHA4 8NH: not on the flood risk listHA4 8NL: not on the flood risk listHA4 8NN: not on the flood risk listHA4 8NP: not on the flood risk listHA4 8NQ: not on the flood risk listHA4 8NR: not on the flood risk listHA4 8NS: not on the flood risk listHA4 8NU: not on the flood risk listHA4 8NY: not on the flood risk listHA4 8PA: not on the flood risk listHA4 8PB: not on the flood risk listHA4 8PD: not on the flood risk listHA4 8PE: not on the flood risk listHA4 8PG: not on the flood risk listHA4 8PH: not on the flood risk listHA4 8PJ: not on the flood risk listHA4 8PP: not on the flood risk listHA4 8PR: not on the flood risk listHA4 8PT: not on the flood risk listHA4 8PX: not on the flood risk listHA4 8QE: not on the flood risk listHA4 8QF: not on the flood risk listHA4 8QG: not on the flood risk listHA4 8QJ: not on the flood risk listHA4 8QL: not on the flood risk listHA4 8QN: not on the flood risk listHA4 8QP: not on the flood risk listHA4 8QQ: not on the flood risk listHA4 8QR: not on the flood risk listHA4 8QS: not on the flood risk listHA4 8QT: not on the flood risk listHA4 8QU: not on the flood risk listHA4 8QW: not on the flood risk listHA4 8QX: not on the flood risk listHA4 8QY: not on the flood risk listHA4 8RG: not on the flood risk listHA4 8RH: not on the flood risk listHA4 8RJ: not on the flood risk listHA4 8RL: not on the flood risk listHA4 8RN: not on the flood risk listHA4 8RQ: not on the flood risk listHA4 8RW: not on the flood risk listHA4 8RX: not on the flood risk listHA4 8RY: not on the flood risk listHA4 8RZ: not on the flood risk listHA4 8SB: not on the flood risk listHA4 8SD: not on the flood risk listHA4 8SL: not on the flood risk listHA4 8SN: not on the flood risk listHA4 8SP: not on the flood risk listHA4 8SR: not on the flood risk listHA4 8SS: not on the flood risk listHA4 8ST: not on the flood risk listHA4 8SU: not on the flood risk listHA4 8SW: not on the flood risk listHA4 8SX: not on the flood risk listHA4 8SY: not on the flood risk listHA4 8SZ: not on the flood risk listHA4 8TA: not on the flood risk listHA4 8TB: not on the flood risk listHA4 8TD: not on the flood risk listHA4 8TE: not on the flood risk listHA4 8TN: not on the flood risk listHA4 8TP: not on the flood risk listHA4 8TR: not on the flood risk listHA4 8TT: not on the flood risk listHA4 8TU: not on the flood risk listHA4 8TW: not on the flood risk listHA4 8TY: not on the flood risk listHA4 8TZ: not on the flood risk listHA4 8UA: not on the flood risk listHA4 8UB: not on the flood risk listHA4 8UD: not on the flood risk listHA4 8UE: not on the flood risk listHA4 8UF: not on the flood risk listHA4 8UG: not on the flood risk listHA4 8UH: not on the flood risk listHA4 8UQ: not on the flood risk listHA4 9AA: not on the flood risk listHA4 9AB: not on the flood risk listHA4 9AD: not on the flood risk listHA4 9AF: not on the flood risk listHA4 9AG: not on the flood risk listHA4 9AH: not on the flood risk listHA4 9AJ: not on the flood risk listHA4 9AL: not on the flood risk listHA4 9AN: not on the flood risk listHA4 9AP: not on the flood risk listHA4 9AQ: not on the flood risk listHA4 9AR: not on the flood risk listHA4 9AS: not on the flood risk listHA4 9AT: not on the flood risk listHA4 9AU: not on the flood risk listHA4 9AW: not on the flood risk listHA4 9AX: not on the flood risk listHA4 9AY: not on the flood risk listHA4 9BF: not on the flood risk listHA4 9BH: not on the flood risk listHA4 9BL: not on the flood risk listHA4 9BN: not on the flood risk listHA4 9BP: not on the flood risk listHA4 9BS: not on the flood risk listHA4 9BT: not on the flood risk listHA4 9BU: not on the flood risk listHA4 9BW: not on the flood risk listHA4 9BX: not on the flood risk listHA4 9BY: not on the flood risk listHA4 9BZ: not on the flood risk listHA4 9DA: not on the flood risk listHA4 9DB: not on the flood risk listHA4 9DD: not on the flood risk listHA4 9DE: not on the flood risk listHA4 9DF: not on the flood risk listHA4 9DL: not on the flood risk listHA4 9DN: not on the flood risk listHA4 9DQ: not on the flood risk listHA4 9DT: not on the flood risk listHA4 9DX: not on the flood risk listHA4 9DZ: not on the flood risk listHA4 9ED: not on the flood risk listHA4 9EF: not on the flood risk listHA4 9EG: not on the flood risk listHA4 9EH: not on the flood risk listHA4 9EJ: not on the flood risk listHA4 9EL: not on the flood risk listHA4 9EN: not on the flood risk listHA4 9EP: not on the flood risk listHA4 9EQ: not on the flood risk listHA4 9EW: not on the flood risk listHA4 9EY: not on the flood risk listHA4 9HB: not on the flood risk listHA4 9HD: not on the flood risk listHA4 9HF: not on the flood risk listHA4 9HG: not on the flood risk listHA4 9HH: not on the flood risk listHA4 9HJ: not on the flood risk listHA4 9HL: not on the flood risk listHA4 9HN: not on the flood risk listHA4 9HP: not on the flood risk listHA4 9HR: not on the flood risk listHA4 9HS: not on the flood risk listHA4 9HT: not on the flood risk listHA4 9HW: not on the flood risk listHA4 9JD: not on the flood risk listHA4 9JE: not on the flood risk listHA4 9JF: not on the flood risk listHA4 9JG: not on the flood risk listHA4 9JH: not on the flood risk listHA4 9JJ: not on the flood risk listHA4 9JL: not on the flood risk listHA4 9JN: not on the flood risk listHA4 9JP: not on the flood risk listHA4 9JQ: not on the flood risk listHA4 9JR: not on the flood risk listHA4 9JS: not on the flood risk listHA4 9JT: not on the flood risk listHA4 9JU: not on the flood risk listHA4 9JW: not on the flood risk listHA4 9LB: not on the flood risk listHA4 9LD: not on the flood risk listHA4 9LE: not on the flood risk listHA4 9LF: not on the flood risk listHA4 9LG: not on the flood risk listHA4 9LP: not on the flood risk listHA4 9LR: not on the flood risk listHA4 9LS: not on the flood risk listHA4 9LU: not on the flood risk listHA4 9LX: not on the flood risk listHA4 9LY: not on the flood risk listHA4 9LZ: not on the flood risk listHA4 9NB: not on the flood risk listHA4 9ND: not on the flood risk listHA4 9NE: not on the flood risk listHA4 9NF: not on the flood risk listHA4 9NG: not on the flood risk listHA4 9NJ: not on the flood risk listHA4 9NQ: not on the flood risk listHA4 9NS: not on the flood risk listHA4 9NX: not on the flood risk listHA4 9NY: not on the flood risk listHA4 9NZ: not on the flood risk listHA4 9PA: not on the flood risk listHA4 9PB: not on the flood risk listHA4 9PD: not on the flood risk listHA4 9PE: not on the flood risk listHA4 9PF: not on the flood risk listHA4 9PG: not on the flood risk listHA4 9PQ: not on the flood risk listHA4 9PR: not on the flood risk listHA4 9PS: not on the flood risk listHA4 9PT: not on the flood risk listHA4 9PU: not on the flood risk listHA4 9PX: not on the flood risk listHA4 9PY: not on the flood risk listHA4 9PZ: not on the flood risk listHA4 9QA: not on the flood risk listHA4 9QB: not on the flood risk listHA4 9QD: not on the flood risk listHA4 9QE: not on the flood risk listHA4 9QF: not on the flood risk listHA4 9QG: not on the flood risk listHA4 9QH: not on the flood risk listHA4 9QJ: not on the flood risk listHA4 9QL: not on the flood risk listHA4 9QN: not on the flood risk listHA4 9QQ: not on the flood risk listHA4 9QX: not on the flood risk listHA4 9QY: not on the flood risk listHA4 9QZ: not on the flood risk listHA4 9RA: not on the flood risk listHA4 9RB: not on the flood risk listHA4 9RD: not on the flood risk listHA4 9RE: not on the flood risk listHA4 9RF: not on the flood risk listHA4 9RG: not on the flood risk listHA4 9RH: not on the flood risk listHA4 9RJ: not on the flood risk listHA4 9RL: not on the flood risk listHA4 9RN: not on the flood risk listHA4 9RP: not on the flood risk listHA4 9RQ: not on the flood risk listHA4 9RW: not on the flood risk listHA4 9RY: not on the flood risk listHA4 9RZ: not on the flood risk listHA4 9SA: not on the flood risk listHA4 9SB: not on the flood risk listHA4 9SD: not on the flood risk listHA4 9SE: not on the flood risk listHA4 9SF: not on the flood risk listHA4 9SG: not on the flood risk listHA4 9SH: not on the flood risk listHA4 9SJ: not on the flood risk listHA4 9SL: not on the flood risk listHA4 9SN: not on the flood risk listHA4 9SP: not on the flood risk listHA4 9SQ: not on the flood risk listHA4 9SR: not on the flood risk listHA4 9SS: not on the flood risk listHA4 9ST: not on the flood risk listHA4 9SU: not on the flood risk listHA4 9SW: not on the flood risk listHA4 9TA: not on the flood risk listHA4 9TD: not on the flood risk listHA4 9TE: not on the flood risk listHA4 9TF: not on the flood risk listHA4 9TG: not on the flood risk listHA4 9TH: not on the flood risk listHA4 9TJ: not on the flood risk listHA4 9TL: not on the flood risk listHA4 9TN: not on the flood risk listHA4 9TP: not on the flood risk listHA4 9TQ: not on the flood risk listHA4 9TR: not on the flood risk listHA4 9TS: not on the flood risk listHA4 9TT: not on the flood risk listHA4 9TU: not on the flood risk listHA4 9TW: not on the flood risk listHA4 9TX: not on the flood risk listHA4 9TY: not on the flood risk listHA4 9TZ: not on the flood risk listHA4 9UA: not on the flood risk listHA4 9UU: not on the flood risk listHA4 9XG: not on the flood risk listHA4 0DB: low flood risk at worstHA4 0DG: low flood risk at worstHA4 0DP: low flood risk at worstHA4 0DR: low flood risk at worstHA4 0EL: low flood risk at worstHA4 0XT: low flood risk at worstHA4 0HS: low flood risk at worstHA4 0JQ: low flood risk at worstHA4 0JS: low flood risk at worstHA4 0LJ: low flood risk at worstHA4 0LP: low flood risk at worstHA4 0LT: low flood risk at worstHA4 0PB: low flood risk at worstHA4 0PD: low flood risk at worstHA4 0PE: low flood risk at worstHA4 0PH: low flood risk at worstHA4 0PJ: low flood risk at worstHA4 0PQ: low flood risk at worstHA4 0PU: low flood risk at worstHA4 0PW: low flood risk at worstHA4 0QB: low flood risk at worstHA4 0QE: low flood risk at worstHA4 0QF: low flood risk at worstHA4 0QL: low flood risk at worstHA4 0QN: low flood risk at worstHA4 0QQ: low flood risk at worstHA4 0TB: low flood risk at worstHA4 6DY: low flood risk at worstHA4 6EA: low flood risk at worstHA4 6LP: low flood risk at worstHA4 6LR: low flood risk at worstHA4 6LS: low flood risk at worstHA4 6NG: low flood risk at worstHA4 6PE: low flood risk at worstHA4 6QU: low flood risk at worstHA4 6QX: low flood risk at worstHA4 6RH: low flood risk at worstHA4 7BE: low flood risk at worstHA4 7JS: low flood risk at worstHA4 7LW: low flood risk at worstHA4 7NB: low flood risk at worstHA4 7NZ: low flood risk at worstHA4 7PA: low flood risk at worstHA4 7PD: low flood risk at worstHA4 7PG: low flood risk at worstHA4 7QE: low flood risk at worstHA4 7SB: low flood risk at worstHA4 7SE: low flood risk at worstHA4 7ST: low flood risk at worstHA4 7SX: low flood risk at worstHA4 7TJ: low flood risk at worstHA4 7TL: low flood risk at worstHA4 7TW: low flood risk at worstHA4 7UZ: low flood risk at worstHA4 7XA: low flood risk at worstHA4 7XB: low flood risk at worstHA4 7XD: low flood risk at worstHA4 8AH: low flood risk at worstHA4 8AQ: low flood risk at worstHA4 8AR: low flood risk at worstHA4 8AS: low flood risk at worstHA4 8BN: low flood risk at worstHA4 8BW: low flood risk at worstHA4 9DG: low flood risk at worstHA4 9DP: low flood risk at worstHA4 9DR: low flood risk at worstHA4 9DS: low flood risk at worstHA4 9DU: low flood risk at worstHA4 9EE: low flood risk at worstHA4 9HA: low flood risk at worstHA4 9HQ: low flood risk at worstHA4 0AJ: medium flood risk at worstHA4 0DS: medium flood risk at worstHA4 0HQ: medium flood risk at worstHA4 0JH: medium flood risk at worstHA4 0JJ: medium flood risk at worstHA4 0LN: medium flood risk at worstHA4 0LR: medium flood risk at worstHA4 0PA: medium flood risk at worstHA4 0PF: medium flood risk at worstHA4 0PG: medium flood risk at worstHA4 0PN: medium flood risk at worstHA4 0PR: medium flood risk at worstHA4 0PX: medium flood risk at worstHA4 0QP: medium flood risk at worstHA4 0QR: medium flood risk at worstHA4 0RJ: medium flood risk at worstHA4 0TD: medium flood risk at worstHA4 0TE: medium flood risk at worstHA4 6LY: medium flood risk at worstHA4 6NA: medium flood risk at worstHA4 6NB: medium flood risk at worstHA4 6PP: medium flood risk at worstHA4 6PR: medium flood risk at worstHA4 7PL: medium flood risk at worstHA4 7QB: medium flood risk at worstHA4 7QH: medium flood risk at worstHA4 7QY: medium flood risk at worstHA4 7RA: medium flood risk at worstHA4 7RE: medium flood risk at worstHA4 7RF: medium flood risk at worstHA4 7SS: medium flood risk at worstHA4 7UT: medium flood risk at worstHA4 8AD: medium flood risk at worstHA4 9EA: medium flood risk at worstHA4 9EB: medium flood risk at worstHA4 0DE: high flood riskHA4 0DF: high flood riskHA4 0JE: high flood riskHA4 0LS: high flood riskHA4 0NP: high flood riskHA4 6LT: high flood riskHA4 6LU: high flood riskHA4 6LX: high flood riskHA4 6NE: high flood riskHA4 6PA: high flood riskHA4 6PN: high flood riskHA4 6PS: high flood riskHA4 6PT: high flood riskHA4 6PU: high flood riskHA4 6PW: high flood riskHA4 6PX: high flood riskHA4 7JT: high flood riskHA4 7JZ: high flood riskHA4 7LP: high flood riskHA4 7ND: high flood riskHA4 7PJ: high flood riskHA4 7PQ: high flood riskHA4 7QF: high flood riskHA4 7QG: high flood riskHA4 7QJ: high flood riskHA4 7QQ: high flood riskHA4 7RD: high flood riskHA4 7RG: high flood riskHA4 7RZ: high flood riskHA4 7SA: high flood riskHA4 7TY: high flood riskHA4 7UJ: high flood riskHA4 7UL: high flood riskHA4 7UN: high flood riskHA4 7XR: high flood riskHA4 7XS: high flood riskHA4 7YJ: high flood riskHA4 7YW: high flood riskHA4 8AA: high flood riskHA4 8AB: high flood riskHA4 8AE: high flood riskHA4 8AF: high flood riskHA4 8AG: high flood riskHA4 8AP: high flood riskHA4 9DY: high flood riskHA4 9EZ: high flood risk RuislipSouth Ruislip 16 postcodes at high or medium risk, outlined: this goes to HA4 6PS, the one with most homes and businesses at high risk16 postcodes at high or medium risk12 postcodes at high or medium risk, outlined: this goes to HA4 7YJ, the one with most homes and businesses at high risk12 postcodes at high or medium risk8 postcodes at high or medium risk, outlined: this goes to HA4 8AG, the one with most homes and businesses at high risk8 postcodes at high or medium risk6 postcodes at high or medium risk, outlined: this goes to HA4 0JH, the one with most homes and businesses at high risk6 postcodes at high or medium risk6 postcodes at high or medium risk, outlined: this goes to HA4 7XS, the one with most homes and businesses at high risk6 postcodes at high or medium risk5 postcodes at high or medium risk, outlined: this goes to HA4 0RJ, the one with most homes and businesses at high risk5 postcodes at high or medium risk Map of every postcode in HA4, by flood risk Of the 1,137 postcodes in HA4 that ONS places, 46 have a home or business at high risk, 35 are at medium risk at worst, 72 are at low risk at worst and 984 are not on the Environment Agency's at-risk list. 6 groups of postcodes at high or medium risk are outlined: 16 postcodes at high or medium risk; 12 postcodes at high or medium risk; 8 postcodes at high or medium risk; 6 postcodes at high or medium risk; 6 postcodes at high or medium risk; 5 postcodes at high or medium risk. Places named: Ruislip, South Ruislip. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A437 RuislipSouth Ruislip
  • A home or business at high risk: 46
  • At medium risk at worst: 35
  • At low risk at worst: 72
  • At very low risk only: 0
  • Not on the at-risk list: 984
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 1,137 postcodes in HA4 that ONS places, 46 have a home or business at high risk, 35 are at medium risk at worst, 72 are at low risk at worst and 984 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. A dashed outline shows where 5 or more lie within 150 metres of each other. It is not a boundary, and 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.

The middle of its postcodes: latitude 51.5703, longitude -0.4107. 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

46 postcodes here have a home or business at high risk. These are the 12 with the most homes and businesses at that risk.

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

HA4 6PS40 at high riskHA4 6PX30 at high riskHA4 6PN28 at high riskHA4 9DY20 at high riskHA4 6LX19 at high riskHA4 6PU19 at high riskHA4 8AG15 at high riskHA4 6NE14 at high riskHA4 7XS12 at high riskHA4 7UL11 at high riskHA4 7ND11 at high riskHA4 7XR10 at high risk

Where the postcodes at high or medium risk lie together

  • 16 postcodes at high or medium risk, outlined on the map. HA4 6PS, is the one with most homes and businesses at high risk.
  • 12 postcodes at high or medium risk, outlined on the map. HA4 7YJ, is the one with most homes and businesses at high risk.
  • 8 postcodes at high or medium risk, outlined on the map. HA4 8AG, is the one with most homes and businesses at high risk.
  • 6 postcodes at high or medium risk, outlined on the map. HA4 0JH, is the one with most homes and businesses at high risk.
  • 6 postcodes at high or medium risk, outlined on the map. HA4 7XS, is the one with most homes and businesses at high risk.
  • 5 postcodes at high or medium risk, outlined on the map. HA4 0RJ, is the one with most homes and businesses at high risk.

What broadband can you get in HA4?

Ofcom reports on 1,113 of the 1,137 postcodes in HA4. At 957 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit957 of 1,113
Postcodes where every home can get superfast1,086 of 1,113

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 HA4 at risk of flooding?

153 of the 1,137 postcodes in HA4 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 762 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 153 of 1,137 postcodes High: 382Medium: 380Low: 1,050Very low: 1

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 HA4?

Homes in HA4 sold for a typical £560,000 in the 12 months to August 2026, across 449 sales, down 3.4% on the 12 months before, HM Land Registry's figures show.

£560,000 typical price, the 12 months to August 2026
£580,000 12 months to August 2025
▼ down 3.4% on the 12 months before
  • Detached £830,000 64 sales
  • Semi-detached £648,750 148 sales
  • Terraced £545,000 121 sales
  • Flat or maisonette £334,500 116 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 HA4

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

HA4 0219 postcodesHA4 414 postcodesHA4 6225 postcodesHA4 7256 postcodesHA4 8221 postcodesHA4 9202 postcodes
UK postcode format explained

Places in HA4

Towns and villages with postcodes in HA4, and how many each has here.

Hillingdon postcodes,1,135Harrow postcodes,2

Who covers HA4

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

  • Ruislip, Northwood and Pinner610
  • Uxbridge and South Ruislip523
  • Harrow West4

Police force areas

  • Metropolitan Police1,137

Next to HA4

HA3 postcode district HA5 postcode district All HA districts Hillingdon postcodes

"Next to" is by number: the districts before and after HA4 in the HA area.

Check a postcode

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