CM9 postcode district: Maldon and around, Essex

CM9 is a postcode district in Essex, with 1,072 postcodes in use in 5 sectors. It has postcodes in Maldon, Tollesbury, Danbury and 1 more place. It is split between 3 councils: Maldon (1,060 postcodes), Colchester (9) and Braintree (3).

Postcodes in use
1,072
Sectors
5
Councils
3 councils
Places
4 places

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

Every postcode in CM9, by flood risk

Map of every postcode in CM9, by flood risk Of the 1,072 postcodes in CM9 that ONS places, 111 have a home or business at high risk, 26 are at medium risk at worst, 56 are at low risk at worst, 36 are at very low risk only and 843 are not on the Environment Agency's at-risk list. 3 groups of postcodes at high or medium risk are outlined: 52 postcodes at high or medium risk; 11 postcodes at high or medium risk; 7 postcodes at high or medium risk. Places named: Maldon, Witham, Hatfield Peverel, Tollesbury, Wickham Bishops, Mayland. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A12 CM9 4AG: not on the flood risk listCM9 4AH: not on the flood risk listCM9 4AL: not on the flood risk listCM9 4AP: not on the flood risk listCM9 4AS: not on the flood risk listCM9 4AX: not on the flood risk listCM9 4AZ: not on the flood risk listCM9 4BA: not on the flood risk listCM9 4BB: not on the flood risk listCM9 4BD: not on the flood risk listCM9 4BH: not on the flood risk listCM9 4BJ: not on the flood risk listCM9 4BL: not on the flood risk listCM9 4BP: not on the flood risk listCM9 4DE: not on the flood risk listCM9 4DG: not on the flood risk listCM9 4DH: not on the flood risk listCM9 4DW: not on the flood risk listCM9 4DZ: not on the flood risk listCM9 4EA: not on the flood risk listCM9 4EB: not on the flood risk listCM9 4EE: not on the flood risk listCM9 4EH: not on the flood risk listCM9 4EP: not on the flood risk listCM9 4ET: not on the flood risk listCM9 4EZ: not on the flood risk listCM9 4FA: not on the flood risk listCM9 4FE: not on the flood risk listCM9 4FH: not on the flood risk listCM9 4FN: not on the flood risk listCM9 4FW: not on the flood risk listCM9 4FZ: not on the flood risk listCM9 4GJ: not on the flood risk listCM9 4GL: not on the flood risk listCM9 4GS: not on the flood risk listCM9 4GT: not on the flood risk listCM9 4GZ: not on the flood risk listCM9 4HD: not on the flood risk listCM9 4HJ: not on the flood risk listCM9 4HL: not on the flood risk listCM9 4HS: not on the flood risk listCM9 4HT: not on the flood risk listCM9 4LG: not on the flood risk listCM9 4PR: not on the flood risk listCM9 4QE: not on the flood risk listCM9 4RE: not on the flood risk listCM9 4SH: not on the flood risk listCM9 4SP: not on the flood risk listCM9 4SR: not on the flood risk listCM9 4SU: not on the flood risk listCM9 4SX: not on the flood risk listCM9 4SY: not on the flood risk listCM9 4SZ: not on the flood risk listCM9 4TA: not on the flood risk listCM9 4TR: not on the flood risk listCM9 4TS: not on the flood risk listCM9 4TT: not on the flood risk listCM9 4TX: not on the flood risk listCM9 4UH: not on the flood risk listCM9 4YP: not on the flood risk listCM9 5AD: not on the flood risk listCM9 5AF: not on the flood risk listCM9 5AG: not on the flood risk listCM9 5AH: not on the flood risk listCM9 5BA: not on the flood risk listCM9 5BQ: not on the flood risk listCM9 5BS: not on the flood risk listCM9 5DA: not on the flood risk listCM9 5DB: not on the flood risk listCM9 5DF: not on the flood risk listCM9 5DJ: not on the flood risk listCM9 5DP: not on the flood risk listCM9 5DR: not on the flood risk listCM9 5DU: not on the flood risk listCM9 5DX: not on the flood risk listCM9 5DY: not on the flood risk listCM9 5EA: not on the flood risk listCM9 5EF: not on the flood risk listCM9 5EJ: not on the flood risk listCM9 5FP: not on the flood risk listCM9 5FT: not on the flood risk listCM9 5GZ: not on the flood risk listCM9 5HP: not on the flood risk listCM9 5HQ: not on the flood risk listCM9 5JD: not on the flood risk listCM9 5JE: not on the flood risk listCM9 5JJ: not on the flood risk listCM9 5JN: not on the flood risk listCM9 5JP: not on the flood risk listCM9 5JT: not on the flood risk listCM9 5JY: not on the flood risk listCM9 5LA: not on the flood risk listCM9 5LB: not on the flood risk listCM9 5LH: not on the flood risk listCM9 5LJ: not on the flood risk listCM9 5QJ: not on the flood risk listCM9 5QR: not on the flood risk listCM9 5QW: not on the flood risk listCM9 5UY: not on the flood risk listCM9 6AB: not on the flood risk listCM9 6AD: not on the flood risk listCM9 6AG: not on the flood risk listCM9 6AJ: not on the flood risk listCM9 6AL: not on the flood risk listCM9 6AP: not on the flood risk listCM9 6AR: not on the flood risk listCM9 6AT: not on the flood risk listCM9 6AU: not on the flood risk listCM9 6AW: not on the flood risk listCM9 6AY: not on the flood risk listCM9 6AZ: not on the flood risk listCM9 6BA: not on the flood risk listCM9 6BD: not on the flood risk listCM9 6BE: not on the flood risk listCM9 6BF: not on the flood risk listCM9 6BJ: not on the flood risk listCM9 6BL: not on the flood risk listCM9 6BN: not on the flood risk listCM9 6BT: not on the flood risk listCM9 6BU: not on the flood risk listCM9 6BW: not on the flood risk listCM9 6BX: not on the flood risk listCM9 6BZ: not on the flood risk listCM9 6DH: not on the flood risk listCM9 6DL: not on the flood risk listCM9 6DN: not on the flood risk listCM9 6DP: not on the flood risk listCM9 6DU: not on the flood risk listCM9 6DY: not on the flood risk listCM9 6DZ: not on the flood risk listCM9 6EB: not on the flood risk listCM9 6ED: not on the flood risk listCM9 6EE: not on the flood risk listCM9 6EG: not on the flood risk listCM9 6EH: not on the flood risk listCM9 6EP: not on the flood risk listCM9 6FA: not on the flood risk listCM9 6FF: not on the flood risk listCM9 6FH: not on the flood risk listCM9 6FJ: not on the flood risk listCM9 6FQ: not on the flood risk listCM9 6FS: not on the flood risk listCM9 6FT: not on the flood risk listCM9 6FX: not on the flood risk listCM9 6FY: not on the flood risk listCM9 6GA: not on the flood risk listCM9 6GG: not on the flood risk listCM9 6GH: not on the flood risk listCM9 6GL: not on the flood risk listCM9 6GN: not on the flood risk listCM9 6GP: not on the flood risk listCM9 6GQ: not on the flood risk listCM9 6GR: not on the flood risk listCM9 6GS: not on the flood risk listCM9 6GT: not on the flood risk listCM9 6GU: not on the flood risk listCM9 6GY: not on the flood risk listCM9 6HB: not on the flood risk listCM9 6HE: not on the flood risk listCM9 6HG: not on the flood risk listCM9 6HH: not on the flood risk listCM9 6HJ: not on the flood risk listCM9 6HR: not on the flood risk listCM9 6HS: not on the flood risk listCM9 6HT: not on the flood risk listCM9 6HU: not on the flood risk listCM9 6HX: not on the flood risk listCM9 6HY: not on the flood risk listCM9 6JG: not on the flood risk listCM9 6JH: not on the flood risk listCM9 6JN: not on the flood risk listCM9 6JP: not on the flood risk listCM9 6JQ: not on the flood risk listCM9 6JU: not on the flood risk listCM9 6LA: not on the flood risk listCM9 6LE: not on the flood risk listCM9 6LG: not on the flood risk listCM9 6LH: not on the flood risk listCM9 6LJ: not on the flood risk listCM9 6LN: not on the flood risk listCM9 6LP: not on the flood risk listCM9 6LR: not on the flood risk listCM9 6LS: not on the flood risk listCM9 6LT: not on the flood risk listCM9 6LU: not on the flood risk listCM9 6LW: not on the flood risk listCM9 6LX: not on the flood risk listCM9 6LY: not on the flood risk listCM9 6ND: not on the flood risk listCM9 6NF: not on the flood risk listCM9 6NH: not on the flood risk listCM9 6NJ: not on the flood risk listCM9 6NL: not on the flood risk listCM9 6NP: not on the flood risk listCM9 6NR: not on the flood risk listCM9 6NS: not on the flood risk listCM9 6NT: not on the flood risk listCM9 6NX: not on the flood risk listCM9 6PA: not on the flood risk listCM9 6PB: not on the flood risk listCM9 6PD: not on the flood risk listCM9 6PF: not on the flood risk listCM9 6PG: not on the flood risk listCM9 6PH: not on the flood risk listCM9 6PQ: not on the flood risk listCM9 6PR: not on the flood risk listCM9 6PS: not on the flood risk listCM9 6PT: not on the flood risk listCM9 6PU: not on the flood risk listCM9 6PX: not on the flood risk listCM9 6PY: not on the flood risk listCM9 6PZ: not on the flood risk listCM9 6QB: not on the flood risk listCM9 6QE: not on the flood risk listCM9 6QF: not on the flood risk listCM9 6QH: not on the flood risk listCM9 6QJ: not on the flood risk listCM9 6QL: not on the flood risk listCM9 6QP: not on the flood risk listCM9 6QQ: not on the flood risk listCM9 6QR: not on the flood risk listCM9 6QS: not on the flood risk listCM9 6QT: not on the flood risk listCM9 6QZ: not on the flood risk listCM9 6RE: not on the flood risk listCM9 6RH: not on the flood risk listCM9 6RJ: not on the flood risk listCM9 6RL: not on the flood risk listCM9 6RN: not on the flood risk listCM9 6RQ: not on the flood risk listCM9 6RR: not on the flood risk listCM9 6RS: not on the flood risk listCM9 6RT: not on the flood risk listCM9 6RU: not on the flood risk listCM9 6RW: not on the flood risk listCM9 6RX: not on the flood risk listCM9 6RY: not on the flood risk listCM9 6RZ: not on the flood risk listCM9 6SD: not on the flood risk listCM9 6SE: not on the flood risk listCM9 6SG: not on the flood risk listCM9 6SH: not on the flood risk listCM9 6SJ: not on the flood risk listCM9 6SL: not on the flood risk listCM9 6SN: not on the flood risk listCM9 6SP: not on the flood risk listCM9 6SQ: not on the flood risk listCM9 6SR: not on the flood risk listCM9 6SS: not on the flood risk listCM9 6ST: not on the flood risk listCM9 6SU: not on the flood risk listCM9 6SW: not on the flood risk listCM9 6SX: not on the flood risk listCM9 6SY: not on the flood risk listCM9 6SZ: not on the flood risk listCM9 6TA: not on the flood risk listCM9 6TB: not on the flood risk listCM9 6TD: not on the flood risk listCM9 6TE: not on the flood risk listCM9 6TF: not on the flood risk listCM9 6TG: not on the flood risk listCM9 6TH: not on the flood risk listCM9 6TJ: not on the flood risk listCM9 6TL: not on the flood risk listCM9 6TN: not on the flood risk listCM9 6TP: not on the flood risk listCM9 6TQ: not on the flood risk listCM9 6TR: not on the flood risk listCM9 6TS: not on the flood risk listCM9 6TT: not on the flood risk listCM9 6TY: not on the flood risk listCM9 6TZ: not on the flood risk listCM9 6UB: not on the flood risk listCM9 6UG: not on the flood risk listCM9 6UJ: not on the flood risk listCM9 6UP: not on the flood risk listCM9 6UX: not on the flood risk listCM9 6UZ: not on the flood risk listCM9 6WG: not on the flood risk listCM9 6WY: not on the flood risk listCM9 6XF: not on the flood risk listCM9 6XL: not on the flood risk listCM9 6XN: not on the flood risk listCM9 6XU: not on the flood risk listCM9 6YG: not on the flood risk listCM9 6YQ: not on the flood risk listCM9 6YS: not on the flood risk listCM9 6YT: not on the flood risk listCM9 6YY: not on the flood risk listCM9 6ZH: not on the flood risk listCM9 6ZJ: not on the flood risk listCM9 6ZL: not on the flood risk listCM9 8AA: not on the flood risk listCM9 8AB: not on the flood risk listCM9 8AE: not on the flood risk listCM9 8AF: not on the flood risk listCM9 8AG: not on the flood risk listCM9 8AJ: not on the flood risk listCM9 8AN: not on the flood risk listCM9 8AP: not on the flood risk listCM9 8AR: not on the flood risk listCM9 8AS: not on the flood risk listCM9 8AW: not on the flood risk listCM9 8AY: not on the flood risk listCM9 8AZ: not on the flood risk listCM9 8BA: not on the flood risk listCM9 8BE: not on the flood risk listCM9 8BG: not on the flood risk listCM9 8BJ: not on the flood risk listCM9 8BR: not on the flood risk listCM9 8BT: not on the flood risk listCM9 8BU: not on the flood risk listCM9 8BW: not on the flood risk listCM9 8BX: not on the flood risk listCM9 8BY: not on the flood risk listCM9 8BZ: not on the flood risk listCM9 8DA: not on the flood risk listCM9 8DD: not on the flood risk listCM9 8DE: not on the flood risk listCM9 8DF: not on the flood risk listCM9 8DG: not on the flood risk listCM9 8DH: not on the flood risk listCM9 8DJ: not on the flood risk listCM9 8DS: not on the flood risk listCM9 8DT: not on the flood risk listCM9 8DU: not on the flood risk listCM9 8DX: not on the flood risk listCM9 8DY: not on the flood risk listCM9 8EA: not on the flood risk listCM9 8EB: not on the flood risk listCM9 8ED: not on the flood risk listCM9 8EE: not on the flood risk listCM9 8EH: not on the flood risk listCM9 8EJ: not on the flood risk listCM9 8EL: not on the flood risk listCM9 8EN: not on the flood risk listCM9 8EP: not on the flood risk listCM9 8ER: not on the flood risk listCM9 8ES: not on the flood risk listCM9 8ET: not on the flood risk listCM9 8EU: not on the flood risk listCM9 8EW: not on the flood risk listCM9 8EX: not on the flood risk listCM9 8EY: not on the flood risk listCM9 8EZ: not on the flood risk listCM9 8FA: not on the flood risk listCM9 8FB: not on the flood risk listCM9 8FD: not on the flood risk listCM9 8FG: not on the flood risk listCM9 8FH: not on the flood risk listCM9 8FL: not on the flood risk listCM9 8FN: not on the flood risk listCM9 8FS: not on the flood risk listCM9 8FW: not on the flood risk listCM9 8GB: not on the flood risk listCM9 8HA: not on the flood risk listCM9 8HB: not on the flood risk listCM9 8HD: not on the flood risk listCM9 8HE: not on the flood risk listCM9 8HF: not on the flood risk listCM9 8HG: not on the flood risk listCM9 8HP: not on the flood risk listCM9 8HR: not on the flood risk listCM9 8HT: not on the flood risk listCM9 8HX: not on the flood risk listCM9 8JB: not on the flood risk listCM9 8JE: not on the flood risk listCM9 8JG: not on the flood risk listCM9 8JH: not on the flood risk listCM9 8JL: not on the flood risk listCM9 8JN: not on the flood risk listCM9 8JP: not on the flood risk listCM9 8JR: not on the flood risk listCM9 8JS: not on the flood risk listCM9 8JT: not on the flood risk listCM9 8JU: not on the flood risk listCM9 8JW: not on the flood risk listCM9 8JX: not on the flood risk listCM9 8JY: not on the flood risk listCM9 8JZ: not on the flood risk listCM9 8LA: not on the flood risk listCM9 8LD: not on the flood risk listCM9 8LE: not on the flood risk listCM9 8LF: not on the flood risk listCM9 8LG: not on the flood risk listCM9 8LL: not on the flood risk listCM9 8LN: not on the flood risk listCM9 8LP: not on the flood risk listCM9 8LQ: not on the flood risk listCM9 8LR: not on the flood risk listCM9 8LT: not on the flood risk listCM9 8LW: not on the flood risk listCM9 8NB: not on the flood risk listCM9 8NE: not on the flood risk listCM9 8NF: not on the flood risk listCM9 8NG: not on the flood risk listCM9 8NH: not on the flood risk listCM9 8NL: not on the flood risk listCM9 8NN: not on the flood risk listCM9 8NP: not on the flood risk listCM9 8NR: not on the flood risk listCM9 8NT: not on the flood risk listCM9 8NU: not on the flood risk listCM9 8NX: not on the flood risk listCM9 8NY: not on the flood risk listCM9 8NZ: not on the flood risk listCM9 8PA: not on the flood risk listCM9 8PB: not on the flood risk listCM9 8PE: not on the flood risk listCM9 8PF: not on the flood risk listCM9 8PH: not on the flood risk listCM9 8PJ: not on the flood risk listCM9 8PN: not on the flood risk listCM9 8PT: not on the flood risk listCM9 8PU: not on the flood risk listCM9 8PW: not on the flood risk listCM9 8PX: not on the flood risk listCM9 8PZ: not on the flood risk listCM9 8QD: not on the flood risk listCM9 8QE: not on the flood risk listCM9 8QH: not on the flood risk listCM9 8QJ: not on the flood risk listCM9 8QL: not on the flood risk listCM9 8QN: not on the flood risk listCM9 8QP: not on the flood risk listCM9 8QQ: not on the flood risk listCM9 8QS: not on the flood risk listCM9 8QU: not on the flood risk listCM9 8QX: not on the flood risk listCM9 8QY: not on the flood risk listCM9 8RD: not on the flood risk listCM9 8RH: not on the flood risk listCM9 8RJ: not on the flood risk listCM9 8RN: not on the flood risk listCM9 8RP: not on the flood risk listCM9 8SD: not on the flood risk listCM9 8SG: not on the flood risk listCM9 8SH: not on the flood risk listCM9 8SJ: not on the flood risk listCM9 8SN: not on the flood risk listCM9 8SP: not on the flood risk listCM9 8SQ: not on the flood risk listCM9 8SR: not on the flood risk listCM9 8SX: not on the flood risk listCM9 8TE: not on the flood risk listCM9 8TF: not on the flood risk listCM9 8TH: not on the flood risk listCM9 8TJ: not on the flood risk listCM9 8TL: not on the flood risk listCM9 8TN: not on the flood risk listCM9 8TQ: not on the flood risk listCM9 8TR: not on the flood risk listCM9 8TS: not on the flood risk listCM9 8TT: not on the flood risk listCM9 8TU: not on the flood risk listCM9 8TW: not on the flood risk listCM9 8TX: not on the flood risk listCM9 8UA: not on the flood risk listCM9 8UB: not on the flood risk listCM9 8UD: not on the flood risk listCM9 8UF: not on the flood risk listCM9 8US: not on the flood risk listCM9 8WD: not on the flood risk listCM9 8XP: not on the flood risk listCM9 8XQ: not on the flood risk listCM9 8YF: not on the flood risk listCM9 4AD: very low flood risk onlyCM9 4AN: very low flood risk onlyCM9 4NR: very low flood risk onlyCM9 4PF: very low flood risk onlyCM9 4PH: very low flood risk onlyCM9 4PU: very low flood risk onlyCM9 4QA: very low flood risk onlyCM9 4QG: very low flood risk onlyCM9 4TF: very low flood risk onlyCM9 4UE: very low flood risk onlyCM9 4TJ: very low flood risk onlyCM9 4UD: very low flood risk onlyCM9 4UF: very low flood risk onlyCM9 4YN: very low flood risk onlyCM9 6PN: very low flood risk onlyCM9 4GG: low flood risk at worstCM9 4NU: low flood risk at worstCM9 4PW: low flood risk at worstCM9 4QS: low flood risk at worstCM9 4RB: low flood risk at worstCM9 4RF: low flood risk at worstCM9 4UQ: low flood risk at worstCM9 4XL: low flood risk at worstCM9 4YL: low flood risk at worstCM9 4YY: low flood risk at worstCM9 4YU: low flood risk at worstCM9 5FA: low flood risk at worstCM9 5GU: low flood risk at worstCM9 6JB: low flood risk at worstCM9 6GJ: low flood risk at worstCM9 6FB: low flood risk at worstCM9 6JW: low flood risk at worstCM9 6NA: low flood risk at worstCM9 6NU: low flood risk at worstCM9 6NY: low flood risk at worstCM9 6PL: low flood risk at worstCM9 6QD: low flood risk at worstCM9 6RP: low flood risk at worstCM9 6UE: low flood risk at worstCM9 6WB: low flood risk at worstCM9 6XS: low flood risk at worstCM9 6XX: low flood risk at worstCM9 6YX: low flood risk at worstCM9 6ZF: low flood risk at worstCM9 6ZS: low flood risk at worstCM9 8AH: low flood risk at worstCM9 8AQ: low flood risk at worstCM9 8AT: low flood risk at worstCM9 8AU: low flood risk at worstCM9 8AX: low flood risk at worstCM9 8FE: low flood risk at worstCM9 8PR: low flood risk at worstCM9 8SB: low flood risk at worstCM9 4PA: medium flood risk at worstCM9 4SN: medium flood risk at worstCM9 4LQ: medium flood risk at worstCM9 4LJ: medium flood risk at worstCM9 4LL: medium flood risk at worstCM9 4LT: medium flood risk at worstCM9 4RG: medium flood risk at worstCM9 4RJ: medium flood risk at worstCM9 4RQ: medium flood risk at worstCM9 4ST: medium flood risk at worstCM9 4XD: medium flood risk at worstCM9 8AL: medium flood risk at worstCM9 8RY: medium flood risk at worstCM9 8LU: medium flood risk at worstCM9 8LY: medium flood risk at worstCM9 8RW: medium flood risk at worstCM9 8ST: medium flood risk at worstCM9 4AA: high flood riskCM9 4BT: high flood riskCM9 4DB: high flood riskCM9 4NW: high flood riskCM9 4DR: high flood riskCM9 4EJ: high flood riskCM9 4ER: high flood riskCM9 4GD: high flood riskCM9 4LD: high flood riskCM9 4LA: high flood riskCM9 4LB: high flood riskCM9 4LE: high flood riskCM9 4LF: high flood riskCM9 4NA: high flood riskCM9 4NB: high flood riskCM9 4NF: high flood riskCM9 4NG: high flood riskCM9 4NT: high flood riskCM9 4PG: high flood riskCM9 4PQ: high flood riskCM9 4PT: high flood riskCM9 4QP: high flood riskCM9 4QT: high flood riskCM9 4QU: high flood riskCM9 4QX: high flood riskCM9 4QY: high flood riskCM9 4RA: high flood riskCM9 4RD: high flood riskCM9 4RH: high flood riskCM9 4RP: high flood riskCM9 4RS: high flood riskCM9 4SE: high flood riskCM9 4RY: high flood riskCM9 4RZ: high flood riskCM9 4SA: high flood riskCM9 4SD: high flood riskCM9 4SF: high flood riskCM9 4SG: high flood riskCM9 4SJ: high flood riskCM9 4SL: high flood riskCM9 4SQ: high flood riskCM9 4SS: high flood riskCM9 4SW: high flood riskCM9 4TB: high flood riskCM9 4TE: high flood riskCM9 4TL: high flood riskCM9 4UP: high flood riskCM9 4UU: high flood riskCM9 4XP: high flood riskCM9 5HG: high flood riskCM9 5HL: high flood riskCM9 5HN: high flood riskCM9 5JQ: high flood riskCM9 5UR: high flood riskCM9 6FR: high flood riskCM9 6LL: high flood riskCM9 6NN: high flood riskCM9 6NQ: high flood riskCM9 6NZ: high flood riskCM9 6PE: high flood riskCM9 6PJ: high flood riskCM9 6PP: high flood riskCM9 6PW: high flood riskCM9 6QA: high flood riskCM9 6QU: high flood riskCM9 6QX: high flood riskCM9 6QY: high flood riskCM9 6RA: high flood riskCM9 6RB: high flood riskCM9 6RF: high flood riskCM9 8BQ: high flood riskCM9 8HH: high flood riskCM9 8HJ: high flood riskCM9 8HL: high flood riskCM9 8HW: high flood riskCM9 8JA: high flood riskCM9 8JD: high flood riskCM9 8JF: high flood riskCM9 8JQ: high flood riskCM9 8LS: high flood riskCM9 8LX: high flood riskCM9 8NA: high flood riskCM9 8NS: high flood riskCM9 8QB: high flood riskCM9 8SE: high flood riskCM9 8SS: high flood riskCM9 8TP: high flood riskCM9 8UH: high flood riskCM9 8WB: high flood risk MaldonWithamHatfield PeverelTollesburyWickham BishopsMayland 52 postcodes at high or medium risk, outlined: this goes to CM9 4GD, the one with most homes and businesses at high risk52 postcodes at high or medium risk11 postcodes at high or medium risk, outlined: this goes to CM9 4RS, the one with most homes and businesses at high risk11 postcodes at high or medium risk Map of every postcode in CM9, by flood risk Of the 1,072 postcodes in CM9 that ONS places, 111 have a home or business at high risk, 26 are at medium risk at worst, 56 are at low risk at worst, 36 are at very low risk only and 843 are not on the Environment Agency's at-risk list. 3 groups of postcodes at high or medium risk are outlined: 52 postcodes at high or medium risk; 11 postcodes at high or medium risk; 7 postcodes at high or medium risk. Places named: Maldon, Witham, Hatfield Peverel, Tollesbury. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 5 km. MaldonWithamHatfield PeverelTollesbury
  • A home or business at high risk: 111
  • At medium risk at worst: 26
  • At low risk at worst: 56
  • At very low risk only: 36
  • Not on the at-risk list: 843
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 1,072 postcodes in CM9 that ONS places, 111 have a home or business at high risk, 26 are at medium risk at worst, 56 are at low risk at worst, 36 are at very low risk only and 843 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 170 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.

The middle of its postcodes: latitude 51.7404, longitude 0.6987. 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

111 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.

CM9 4RA63 at high riskCM9 8SE50 at high riskCM9 4QP43 at high riskCM9 4GD35 at high riskCM9 6PJ32 at high riskCM9 4TB27 at high riskCM9 5HN26 at high riskCM9 4NF24 at high riskCM9 8HL20 at high riskCM9 4TG20 at high riskCM9 4NB19 at high riskCM9 4NA19 at high risk

Where the postcodes at high or medium risk lie together

  • 52 postcodes at high or medium risk, outlined on the map. CM9 4GD, is the one with most homes and businesses at high risk.
  • 11 postcodes at high or medium risk, outlined on the map. CM9 4RS, is the one with most homes and businesses at high risk.
  • 7 postcodes at high or medium risk, outlined on the map. CM9 4LF, is the one with most homes and businesses at high risk.

What broadband can you get in CM9?

Ofcom reports on 986 of the 1,072 postcodes in CM9. At 700 of them every home and business can get gigabit broadband, and at 16 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit700 of 986
Postcodes where every home can get superfast892 of 986
Postcodes where some cannot get decent broadband16 of 986

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 CM9 at risk of flooding?

229 of the 1,072 postcodes in CM9 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 1,334 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 229 of 1,072 postcodes High: 897Medium: 437Low: 1,797Very low: 1,371

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 CM9?

Homes in CM9 sold for a typical £368,000 in the 12 months to August 2026, across 413 sales, down 4.4% on the 12 months before, HM Land Registry's figures show.

£368,000 typical price, the 12 months to August 2026
£385,000 12 months to August 2025
▼ down 4.4% on the 12 months before
  • Detached £520,000 160 sales
  • Semi-detached £355,000 138 sales
  • Terraced £292,250 84 sales
  • Flat or maisonette £210,000 31 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 CM9

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

CM9 4281 postcodesCM9 5124 postcodesCM9 6359 postcodesCM9 8275 postcodesCM9 933 postcodes
UK postcode format explained

Places in CM9

Towns and villages with postcodes in CM9, and how many each has here.

Maldon postcodes,567Tollesbury postcodes,61Danbury postcodes,2Wickham Bishops postcodes,1

Who covers CM9

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

  • Maldon647
  • Witham425

Police force areas

  • Essex1,072

Next to CM9

CM8 postcode district CM11 postcode district All CM districts Maldon postcodes

"Next to" is by number: the districts before and after CM9 in the CM area.

Check a postcode

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