SM4 postcode district: Merton and around

SM4 is a postcode district in England, with 581 postcodes in use in 4 sectors. It has postcodes in Merton and Sutton. It is split between 2 councils: Merton (533 postcodes) and Sutton (48).

Postcodes in use
581
Sectors
4
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 SM4, by flood risk

Map of every postcode in SM4, by flood risk Of the 581 postcodes in SM4 that ONS places, 7 have a home or business at high risk, 12 are at medium risk at worst, 39 are at low risk at worst and 523 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 5 postcodes at high or medium risk. 2 postcodes lie beyond the edge and are listed under the map. Places named: St Helier, Lower Morden. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. SM4 4AB: not on the flood risk listSM4 4AD: not on the flood risk listSM4 4AE: not on the flood risk listSM4 4AG: not on the flood risk listSM4 4AH: not on the flood risk listSM4 4AJ: not on the flood risk listSM4 4AN: not on the flood risk listSM4 4AP: not on the flood risk listSM4 4AR: not on the flood risk listSM4 4AT: not on the flood risk listSM4 4AU: not on the flood risk listSM4 4AW: not on the flood risk listSM4 4AX: not on the flood risk listSM4 4AY: not on the flood risk listSM4 4AZ: not on the flood risk listSM4 4BA: not on the flood risk listSM4 4BB: not on the flood risk listSM4 4BE: not on the flood risk listSM4 4BH: not on the flood risk listSM4 4BN: not on the flood risk listSM4 4BP: not on the flood risk listSM4 4BQ: not on the flood risk listSM4 4BS: not on the flood risk listSM4 4BU: not on the flood risk listSM4 4BW: not on the flood risk listSM4 4BX: not on the flood risk listSM4 4DA: not on the flood risk listSM4 4DB: not on the flood risk listSM4 4DD: not on the flood risk listSM4 4DF: not on the flood risk listSM4 4DG: not on the flood risk listSM4 4DH: not on the flood risk listSM4 4DJ: not on the flood risk listSM4 4DL: not on the flood risk listSM4 4DN: not on the flood risk listSM4 4DP: not on the flood risk listSM4 4DQ: not on the flood risk listSM4 4DR: not on the flood risk listSM4 4DS: not on the flood risk listSM4 4DW: not on the flood risk listSM4 4DX: not on the flood risk listSM4 4EA: not on the flood risk listSM4 4EB: not on the flood risk listSM4 4ED: not on the flood risk listSM4 4EE: not on the flood risk listSM4 4EF: not on the flood risk listSM4 4EG: not on the flood risk listSM4 4EL: not on the flood risk listSM4 4EN: not on the flood risk listSM4 4EP: not on the flood risk listSM4 4EQ: not on the flood risk listSM4 4ER: not on the flood risk listSM4 4ES: not on the flood risk listSM4 4ET: not on the flood risk listSM4 4EU: not on the flood risk listSM4 4EW: not on the flood risk listSM4 4HA: not on the flood risk listSM4 4HB: not on the flood risk listSM4 4HD: not on the flood risk listSM4 4HE: not on the flood risk listSM4 4HF: not on the flood risk listSM4 4HG: not on the flood risk listSM4 4HH: not on the flood risk listSM4 4HJ: not on the flood risk listSM4 4HL: not on the flood risk listSM4 4HQ: not on the flood risk listSM4 4HS: not on the flood risk listSM4 4HU: not on the flood risk listSM4 4HW: not on the flood risk listSM4 4HX: not on the flood risk listSM4 4HZ: not on the flood risk listSM4 4JB: not on the flood risk listSM4 4JD: not on the flood risk listSM4 4JE: not on the flood risk listSM4 4JF: not on the flood risk listSM4 4JG: not on the flood risk listSM4 4JL: not on the flood risk listSM4 4JQ: not on the flood risk listSM4 4JY: not on the flood risk listSM4 4LE: not on the flood risk listSM4 4LP: not on the flood risk listSM4 4LZ: not on the flood risk listSM4 4NE: not on the flood risk listSM4 4NF: not on the flood risk listSM4 4NH: not on the flood risk listSM4 4NJ: not on the flood risk listSM4 4NL: not on the flood risk listSM4 4PD: not on the flood risk listSM4 4PE: not on the flood risk listSM4 4PF: not on the flood risk listSM4 4PG: not on the flood risk listSM4 4PH: not on the flood risk listSM4 4PJ: not on the flood risk listSM4 4PL: not on the flood risk listSM4 4PN: not on the flood risk listSM4 4PQ: not on the flood risk listSM4 4PS: not on the flood risk listSM4 4PT: not on the flood risk listSM4 4PU: not on the flood risk listSM4 4PX: not on the flood risk listSM4 4PY: not on the flood risk listSM4 4PZ: not on the flood risk listSM4 4QA: not on the flood risk listSM4 4QB: not on the flood risk listSM4 4QD: not on the flood risk listSM4 4QF: not on the flood risk listSM4 4QG: not on the flood risk listSM4 4QN: not on the flood risk listSM4 4QP: not on the flood risk listSM4 4QQ: not on the flood risk listSM4 4QU: not on the flood risk listSM4 4QW: not on the flood risk listSM4 4QX: not on the flood risk listSM4 4QY: not on the flood risk listSM4 4QZ: not on the flood risk listSM4 4RA: not on the flood risk listSM4 4RB: not on the flood risk listSM4 4RD: not on the flood risk listSM4 4RF: not on the flood risk listSM4 4RH: not on the flood risk listSM4 4RJ: not on the flood risk listSM4 4RN: not on the flood risk listSM4 4RP: not on the flood risk listSM4 4RQ: not on the flood risk listSM4 4RR: not on the flood risk listSM4 4RS: not on the flood risk listSM4 4RT: not on the flood risk listSM4 4RU: not on the flood risk listSM4 4RW: not on the flood risk listSM4 4SA: not on the flood risk listSM4 4SE: not on the flood risk listSM4 4SF: not on the flood risk listSM4 4SP: not on the flood risk listSM4 4SR: not on the flood risk listSM4 4ST: not on the flood risk listSM4 4SU: not on the flood risk listSM4 4SW: not on the flood risk listSM4 4SX: not on the flood risk listSM4 4SY: not on the flood risk listSM4 4SZ: not on the flood risk listSM4 4TA: not on the flood risk listSM4 4TB: not on the flood risk listSM4 4TD: not on the flood risk listSM4 5AA: not on the flood risk listSM4 5AB: not on the flood risk listSM4 5AD: not on the flood risk listSM4 5AE: not on the flood risk listSM4 5AF: not on the flood risk listSM4 5AG: not on the flood risk listSM4 5AH: not on the flood risk listSM4 5AJ: not on the flood risk listSM4 5AL: not on the flood risk listSM4 5AN: not on the flood risk listSM4 5AP: not on the flood risk listSM4 5AQ: not on the flood risk listSM4 5AR: not on the flood risk listSM4 5AS: not on the flood risk listSM4 5AT: not on the flood risk listSM4 5AW: not on the flood risk listSM4 5AX: not on the flood risk listSM4 5AZ: not on the flood risk listSM4 5BA: not on the flood risk listSM4 5BE: not on the flood risk listSM4 5BF: not on the flood risk listSM4 5BG: not on the flood risk listSM4 5BL: not on the flood risk listSM4 5BQ: not on the flood risk listSM4 5BT: not on the flood risk listSM4 5BU: not on the flood risk listSM4 5BW: not on the flood risk listSM4 5BY: not on the flood risk listSM4 5DA: not on the flood risk listSM4 5DB: not on the flood risk listSM4 5DD: not on the flood risk listSM4 5DE: not on the flood risk listSM4 5DF: not on the flood risk listSM4 5DG: not on the flood risk listSM4 5DH: not on the flood risk listSM4 5DJ: not on the flood risk listSM4 5DN: not on the flood risk listSM4 5DP: not on the flood risk listSM4 5DQ: not on the flood risk listSM4 5DS: not on the flood risk listSM4 5DT: not on the flood risk listSM4 5DU: not on the flood risk listSM4 5DW: not on the flood risk listSM4 5DX: not on the flood risk listSM4 5HE: not on the flood risk listSM4 5HG: not on the flood risk listSM4 5HH: not on the flood risk listSM4 5HJ: not on the flood risk listSM4 5HN: not on the flood risk listSM4 5HP: not on the flood risk listSM4 5HQ: not on the flood risk listSM4 5HT: not on the flood risk listSM4 5HW: not on the flood risk listSM4 5HX: not on the flood risk listSM4 5JA: not on the flood risk listSM4 5JF: not on the flood risk listSM4 5JG: not on the flood risk listSM4 5JH: not on the flood risk listSM4 5JJ: not on the flood risk listSM4 5JL: not on the flood risk listSM4 5JN: not on the flood risk listSM4 5JP: not on the flood risk listSM4 5JQ: not on the flood risk listSM4 5JS: not on the flood risk listSM4 5JW: not on the flood risk listSM4 5JX: not on the flood risk listSM4 5JY: not on the flood risk listSM4 5LA: not on the flood risk listSM4 5LB: not on the flood risk listSM4 5LF: not on the flood risk listSM4 5LJ: not on the flood risk listSM4 5LN: not on the flood risk listSM4 5LP: not on the flood risk listSM4 5LQ: not on the flood risk listSM4 5LR: not on the flood risk listSM4 5LT: not on the flood risk listSM4 5LU: not on the flood risk listSM4 5LW: not on the flood risk listSM4 5LX: not on the flood risk listSM4 5LY: not on the flood risk listSM4 5NA: not on the flood risk listSM4 5NB: not on the flood risk listSM4 5ND: not on the flood risk listSM4 5NE: not on the flood risk listSM4 5NF: not on the flood risk listSM4 5NG: not on the flood risk listSM4 5NH: not on the flood risk listSM4 5NJ: not on the flood risk listSM4 5NL: not on the flood risk listSM4 5NN: not on the flood risk listSM4 5NP: not on the flood risk listSM4 5NQ: not on the flood risk listSM4 5NR: not on the flood risk listSM4 5NS: not on the flood risk listSM4 5NT: not on the flood risk listSM4 5NW: not on the flood risk listSM4 5NX: not on the flood risk listSM4 5NY: not on the flood risk listSM4 5NZ: not on the flood risk listSM4 5PA: not on the flood risk listSM4 5PB: not on the flood risk listSM4 5PE: not on the flood risk listSM4 5PF: not on the flood risk listSM4 5PH: not on the flood risk listSM4 5PJ: not on the flood risk listSM4 5PN: not on the flood risk listSM4 5PP: not on the flood risk listSM4 5PQ: not on the flood risk listSM4 5PS: not on the flood risk listSM4 5PT: not on the flood risk listSM4 5PU: not on the flood risk listSM4 5PX: not on the flood risk listSM4 5PY: not on the flood risk listSM4 5PZ: not on the flood risk listSM4 5QA: not on the flood risk listSM4 5QB: not on the flood risk listSM4 5QL: not on the flood risk listSM4 5QN: not on the flood risk listSM4 5QP: not on the flood risk listSM4 5QQ: not on the flood risk listSM4 5QR: not on the flood risk listSM4 5QT: not on the flood risk listSM4 5QU: not on the flood risk listSM4 5QW: not on the flood risk listSM4 5QX: not on the flood risk listSM4 5RA: not on the flood risk listSM4 5RB: not on the flood risk listSM4 5RD: not on the flood risk listSM4 5RE: not on the flood risk listSM4 5RF: not on the flood risk listSM4 5RG: not on the flood risk listSM4 5RJ: not on the flood risk listSM4 5RL: not on the flood risk listSM4 5RN: not on the flood risk listSM4 5RP: not on the flood risk listSM4 5RQ: not on the flood risk listSM4 5RR: not on the flood risk listSM4 5RS: not on the flood risk listSM4 5RT: not on the flood risk listSM4 5RU: not on the flood risk listSM4 5RW: not on the flood risk listSM4 5RX: not on the flood risk listSM4 5RY: not on the flood risk listSM4 5RZ: not on the flood risk listSM4 5SA: not on the flood risk listSM4 5SB: not on the flood risk listSM4 5SD: not on the flood risk listSM4 5SG: not on the flood risk listSM4 5SH: not on the flood risk listSM4 5SJ: not on the flood risk listSM4 5SL: not on the flood risk listSM4 5SP: not on the flood risk listSM4 5SQ: not on the flood risk listSM4 5SR: not on the flood risk listSM4 5ZP: not on the flood risk listSM4 6AD: not on the flood risk listSM4 6AE: not on the flood risk listSM4 6AF: not on the flood risk listSM4 6AG: not on the flood risk listSM4 6AH: not on the flood risk listSM4 6AJ: not on the flood risk listSM4 6AP: not on the flood risk listSM4 6AQ: not on the flood risk listSM4 6AR: not on the flood risk listSM4 6AS: not on the flood risk listSM4 6AX: not on the flood risk listSM4 6AY: not on the flood risk listSM4 6AZ: not on the flood risk listSM4 6BA: not on the flood risk listSM4 6BB: not on the flood risk listSM4 6BE: not on the flood risk listSM4 6BG: not on the flood risk listSM4 6BH: not on the flood risk listSM4 6BL: not on the flood risk listSM4 6BN: not on the flood risk listSM4 6BP: not on the flood risk listSM4 6BQ: not on the flood risk listSM4 6BS: not on the flood risk listSM4 6BT: not on the flood risk listSM4 6BU: not on the flood risk listSM4 6BW: not on the flood risk listSM4 6BX: not on the flood risk listSM4 6BY: not on the flood risk listSM4 6BZ: not on the flood risk listSM4 6DA: not on the flood risk listSM4 6DB: not on the flood risk listSM4 6DD: not on the flood risk listSM4 6DE: not on the flood risk listSM4 6DF: not on the flood risk listSM4 6DG: not on the flood risk listSM4 6DH: not on the flood risk listSM4 6DJ: not on the flood risk listSM4 6DL: not on the flood risk listSM4 6DN: not on the flood risk listSM4 6DP: not on the flood risk listSM4 6DQ: not on the flood risk listSM4 6DR: not on the flood risk listSM4 6DS: not on the flood risk listSM4 6DT: not on the flood risk listSM4 6DU: not on the flood risk listSM4 6DW: not on the flood risk listSM4 6DX: not on the flood risk listSM4 6DY: not on the flood risk listSM4 6DZ: not on the flood risk listSM4 6EB: not on the flood risk listSM4 6ED: not on the flood risk listSM4 6EE: not on the flood risk listSM4 6EF: not on the flood risk listSM4 6EG: not on the flood risk listSM4 6EH: not on the flood risk listSM4 6EJ: not on the flood risk listSM4 6EL: not on the flood risk listSM4 6EN: not on the flood risk listSM4 6EP: not on the flood risk listSM4 6EQ: not on the flood risk listSM4 6ET: not on the flood risk listSM4 6EU: not on the flood risk listSM4 6EW: not on the flood risk listSM4 6EX: not on the flood risk listSM4 6EY: not on the flood risk listSM4 6EZ: not on the flood risk listSM4 6FA: not on the flood risk listSM4 6FD: not on the flood risk listSM4 6FE: not on the flood risk listSM4 6FF: not on the flood risk listSM4 6GA: not on the flood risk listSM4 6GB: not on the flood risk listSM4 6GD: not on the flood risk listSM4 6GE: not on the flood risk listSM4 6GF: not on the flood risk listSM4 6HA: not on the flood risk listSM4 6HB: not on the flood risk listSM4 6HD: not on the flood risk listSM4 6HE: not on the flood risk listSM4 6HF: not on the flood risk listSM4 6HG: not on the flood risk listSM4 6HH: not on the flood risk listSM4 6HJ: not on the flood risk listSM4 6HL: not on the flood risk listSM4 6HN: not on the flood risk listSM4 6HP: not on the flood risk listSM4 6HQ: not on the flood risk listSM4 6HR: not on the flood risk listSM4 6HT: not on the flood risk listSM4 6HU: not on the flood risk listSM4 6HW: not on the flood risk listSM4 6HY: not on the flood risk listSM4 6JD: not on the flood risk listSM4 6JE: not on the flood risk listSM4 6JF: not on the flood risk listSM4 6JG: not on the flood risk listSM4 6JH: not on the flood risk listSM4 6JJ: not on the flood risk listSM4 6JL: not on the flood risk listSM4 6JN: not on the flood risk listSM4 6JP: not on the flood risk listSM4 6JQ: not on the flood risk listSM4 6JR: not on the flood risk listSM4 6JS: not on the flood risk listSM4 6JT: not on the flood risk listSM4 6JU: not on the flood risk listSM4 6JW: not on the flood risk listSM4 6JX: not on the flood risk listSM4 6JY: not on the flood risk listSM4 6JZ: not on the flood risk listSM4 6LA: not on the flood risk listSM4 6LB: not on the flood risk listSM4 6LD: not on the flood risk listSM4 6LE: not on the flood risk listSM4 6LF: not on the flood risk listSM4 6LH: not on the flood risk listSM4 6LJ: not on the flood risk listSM4 6LL: not on the flood risk listSM4 6LN: not on the flood risk listSM4 6LQ: not on the flood risk listSM4 6LR: not on the flood risk listSM4 6LU: not on the flood risk listSM4 6LW: not on the flood risk listSM4 6LX: not on the flood risk listSM4 6LY: not on the flood risk listSM4 6NA: not on the flood risk listSM4 6NE: not on the flood risk listSM4 6NF: not on the flood risk listSM4 6NG: not on the flood risk listSM4 6NJ: not on the flood risk listSM4 6NL: not on the flood risk listSM4 6NN: not on the flood risk listSM4 6NP: not on the flood risk listSM4 6NQ: not on the flood risk listSM4 6NR: not on the flood risk listSM4 6NU: not on the flood risk listSM4 6NW: not on the flood risk listSM4 6PE: not on the flood risk listSM4 6PH: not on the flood risk listSM4 6PJ: not on the flood risk listSM4 6PN: not on the flood risk listSM4 6PP: not on the flood risk listSM4 6PR: not on the flood risk listSM4 6PS: not on the flood risk listSM4 6PT: not on the flood risk listSM4 6PW: not on the flood risk listSM4 6PX: not on the flood risk listSM4 6QA: not on the flood risk listSM4 6QB: not on the flood risk listSM4 6QD: not on the flood risk listSM4 6QE: not on the flood risk listSM4 6QF: not on the flood risk listSM4 6QG: not on the flood risk listSM4 6QH: not on the flood risk listSM4 6QJ: not on the flood risk listSM4 6QL: not on the flood risk listSM4 6QN: not on the flood risk listSM4 6QP: not on the flood risk listSM4 6QQ: not on the flood risk listSM4 6QR: not on the flood risk listSM4 6QT: not on the flood risk listSM4 6QU: not on the flood risk listSM4 6QW: not on the flood risk listSM4 6RA: not on the flood risk listSM4 6RB: not on the flood risk listSM4 6RD: not on the flood risk listSM4 6RE: not on the flood risk listSM4 6RF: not on the flood risk listSM4 6RG: not on the flood risk listSM4 6RH: not on the flood risk listSM4 6RJ: not on the flood risk listSM4 6RL: not on the flood risk listSM4 6RN: not on the flood risk listSM4 6RQ: not on the flood risk listSM4 6RR: not on the flood risk listSM4 6RS: not on the flood risk listSM4 6RT: not on the flood risk listSM4 6RU: not on the flood risk listSM4 6RW: not on the flood risk listSM4 6RZ: not on the flood risk listSM4 6SB: not on the flood risk listSM4 6SD: not on the flood risk listSM4 6SE: not on the flood risk listSM4 6SF: not on the flood risk listSM4 6SG: not on the flood risk listSM4 6SH: not on the flood risk listSM4 6SJ: not on the flood risk listSM4 6SL: not on the flood risk listSM4 6SP: not on the flood risk listSM4 6SQ: not on the flood risk listSM4 6SR: not on the flood risk listSM4 6SS: not on the flood risk listSM4 9SD: not on the flood risk listSM4 4BY: low flood risk at worstSM4 4JR: low flood risk at worstSM4 4JS: low flood risk at worstSM4 4JW: low flood risk at worstSM4 4JZ: low flood risk at worstSM4 4LD: low flood risk at worstSM4 4LG: low flood risk at worstSM4 4LR: low flood risk at worstSM4 4LS: low flood risk at worstSM4 4LU: low flood risk at worstSM4 4NU: low flood risk at worstSM4 4NW: low flood risk at worstSM4 4NY: low flood risk at worstSM4 4RX: low flood risk at worstSM4 4RZ: low flood risk at worstSM4 4SG: low flood risk at worstSM4 4SS: low flood risk at worstSM4 4TQ: low flood risk at worstSM4 4TS: low flood risk at worstSM4 5PR: low flood risk at worstSM4 5QD: low flood risk at worstSM4 5QH: low flood risk at worstSM4 5QS: low flood risk at worstSM4 6AA: low flood risk at worstSM4 6AL: low flood risk at worstSM4 6AW: low flood risk at worstSM4 6FB: low flood risk at worstSM4 6JB: low flood risk at worstSM4 6LP: low flood risk at worstSM4 6LS: low flood risk at worstSM4 6LT: low flood risk at worstSM4 6LZ: low flood risk at worstSM4 6NH: low flood risk at worstSM4 6NX: low flood risk at worstSM4 6NY: low flood risk at worstSM4 6PD: low flood risk at worstSM4 6PF: low flood risk at worstSM4 6PG: low flood risk at worstSM4 6PQ: low flood risk at worstSM4 4BZ: medium flood risk at worstSM4 4EX: medium flood risk at worstSM4 4JJ: medium flood risk at worstSM4 4JN: medium flood risk at worstSM4 4JP: medium flood risk at worstSM4 4JX: medium flood risk at worstSM4 4LF: medium flood risk at worstSM4 4NN: medium flood risk at worstSM4 4NP: medium flood risk at worstSM4 4NX: medium flood risk at worstSM4 5JD: medium flood risk at worstSM4 6AU: medium flood risk at worstSM4 4NR: high flood riskSM4 4NS: high flood riskSM4 4PA: high flood riskSM4 4RY: high flood riskSM4 4SJ: high flood riskSM4 6AB: high flood riskSM4 6BF: high flood risk St HelierLower Morden 5 postcodes at high or medium risk, outlined: this goes to SM4 4NS, the one with most homes and businesses at high risk5 postcodes at high or medium risk Map of every postcode in SM4, by flood risk Of the 581 postcodes in SM4 that ONS places, 7 have a home or business at high risk, 12 are at medium risk at worst, 39 are at low risk at worst and 523 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 5 postcodes at high or medium risk. 2 postcodes lie beyond the edge and are listed under the map. Places named: St Helier, Lower Morden. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. St HelierLower Morden
  • A home or business at high risk: 7
  • At medium risk at worst: 12
  • At low risk at worst: 39
  • At very low risk only: 0
  • Not on the at-risk list: 523
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 581 postcodes in SM4 that ONS places, 7 have a home or business at high risk, 12 are at medium risk at worst, 39 are at low risk at worst and 523 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 51.3930, longitude -0.1997. 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.

SM4 4NS7 at high riskSM4 4RY4 at high riskSM4 4NR2 at high riskSM4 4SJ2 at high riskSM4 6BF1 at high riskSM4 4PA1 at high riskSM4 6AB1 at high risk

2 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.

SM4 4ASSM4 5HA

Where the postcodes at high or medium risk lie together

  • 5 postcodes at high or medium risk, outlined on the map. SM4 4NS, is the one with most homes and businesses at high risk.

What broadband can you get in SM4?

Ofcom reports on 543 of the 581 postcodes in SM4. At 482 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit482 of 543
Postcodes where every home can get superfast531 of 543

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 SM4 at risk of flooding?

58 of the 581 postcodes in SM4 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 109 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 58 of 581 postcodes High: 18Medium: 91Low: 653

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 SM4?

Homes in SM4 sold for a typical £475,000 in the 12 months to August 2026, across 235 sales, down 6.9% on the 12 months before, HM Land Registry's figures show.

£475,000 typical price, the 12 months to August 2026
£510,000 12 months to August 2025
▼ down 6.9% on the 12 months before
  • Detached 4 sales, too few to price
  • Semi-detached £612,000 32 sales
  • Terraced £521,000 130 sales
  • Flat or maisonette £320,000 69 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 SM4

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

SM4 4178 postcodesSM4 5165 postcodesSM4 6211 postcodesSM4 927 postcodes
UK postcode format explained

Places in SM4

Towns and villages with postcodes in SM4, and how many each has here.

Merton postcodes,522Sutton postcodes,58

Who covers SM4

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

  • Mitcham and Morden471
  • Wimbledon62
  • Carshalton and Wallington48

Police force areas

  • Metropolitan Police581

Next to SM4

SM3 postcode district SM5 postcode district All SM districts Merton postcodes

"Next to" is by number: the districts before and after SM4 in the SM area.

Check a postcode

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