CM13 postcode district: Brentwood and around

CM13 is a postcode district mostly in Essex, with 702 postcodes in use in 3 sectors. It has postcodes in Brentwood, Basildon and Havering. It is split between 4 councils: Brentwood (679 postcodes), Basildon (15), Thurrock (7) and 1 other. 694 are in Essex. ONS lists no county for the other 8.

Postcodes in use
702
Sectors
3
Councils
4 councils
Places
3 places

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

Every postcode in CM13, by flood risk

Map of every postcode in CM13, by flood risk Of the 702 postcodes in CM13 that ONS places, 16 have a home or business at high risk, 3 are at medium risk at worst, 3 are at low risk at worst and 680 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 8 postcodes at high or medium risk. Places named: Brentwood. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2 km. A12A1023 CM13 1AD: not on the flood risk listCM13 1AH: not on the flood risk listCM13 1AJ: not on the flood risk listCM13 1AN: not on the flood risk listCM13 1AP: not on the flood risk listCM13 1AQ: not on the flood risk listCM13 1AR: not on the flood risk listCM13 1AS: not on the flood risk listCM13 1AU: not on the flood risk listCM13 1AX: not on the flood risk listCM13 1AZ: not on the flood risk listCM13 1BA: not on the flood risk listCM13 1BD: not on the flood risk listCM13 1BE: not on the flood risk listCM13 1BG: not on the flood risk listCM13 1BH: not on the flood risk listCM13 1BJ: not on the flood risk listCM13 1BL: not on the flood risk listCM13 1BN: not on the flood risk listCM13 1BP: not on the flood risk listCM13 1BQ: not on the flood risk listCM13 1BS: not on the flood risk listCM13 1BT: not on the flood risk listCM13 1BX: not on the flood risk listCM13 1BZ: not on the flood risk listCM13 1DA: not on the flood risk listCM13 1DB: not on the flood risk listCM13 1DD: not on the flood risk listCM13 1DH: not on the flood risk listCM13 1DL: not on the flood risk listCM13 1DU: not on the flood risk listCM13 1EA: not on the flood risk listCM13 1EB: not on the flood risk listCM13 1ED: not on the flood risk listCM13 1EF: not on the flood risk listCM13 1EG: not on the flood risk listCM13 1EH: not on the flood risk listCM13 1EJ: not on the flood risk listCM13 1EN: not on the flood risk listCM13 1EP: not on the flood risk listCM13 1ET: not on the flood risk listCM13 1EU: not on the flood risk listCM13 1EX: not on the flood risk listCM13 1EY: not on the flood risk listCM13 1EZ: not on the flood risk listCM13 1FA: not on the flood risk listCM13 1FD: not on the flood risk listCM13 1FG: not on the flood risk listCM13 1FH: not on the flood risk listCM13 1GB: not on the flood risk listCM13 1HA: not on the flood risk listCM13 1HE: not on the flood risk listCM13 1HG: not on the flood risk listCM13 1HH: not on the flood risk listCM13 1HL: not on the flood risk listCM13 1HN: not on the flood risk listCM13 1HP: not on the flood risk listCM13 1HR: not on the flood risk listCM13 1HS: not on the flood risk listCM13 1HU: not on the flood risk listCM13 1HW: not on the flood risk listCM13 1HX: not on the flood risk listCM13 1HZ: not on the flood risk listCM13 1JA: not on the flood risk listCM13 1JD: not on the flood risk listCM13 1JE: not on the flood risk listCM13 1JL: not on the flood risk listCM13 1JN: not on the flood risk listCM13 1JP: not on the flood risk listCM13 1JR: not on the flood risk listCM13 1JT: not on the flood risk listCM13 1JU: not on the flood risk listCM13 1JW: not on the flood risk listCM13 1JX: not on the flood risk listCM13 1JZ: not on the flood risk listCM13 1LA: not on the flood risk listCM13 1LD: not on the flood risk listCM13 1LG: not on the flood risk listCM13 1LH: not on the flood risk listCM13 1LJ: not on the flood risk listCM13 1LP: not on the flood risk listCM13 1LR: not on the flood risk listCM13 1LW: not on the flood risk listCM13 1LX: not on the flood risk listCM13 1LY: not on the flood risk listCM13 1NA: not on the flood risk listCM13 1NB: not on the flood risk listCM13 1ND: not on the flood risk listCM13 1NE: not on the flood risk listCM13 1NH: not on the flood risk listCM13 1NJ: not on the flood risk listCM13 1NL: not on the flood risk listCM13 1NP: not on the flood risk listCM13 1NR: not on the flood risk listCM13 1NS: not on the flood risk listCM13 1NT: not on the flood risk listCM13 1NU: not on the flood risk listCM13 1NW: not on the flood risk listCM13 1NX: not on the flood risk listCM13 1NZ: not on the flood risk listCM13 1PA: not on the flood risk listCM13 1PB: not on the flood risk listCM13 1PD: not on the flood risk listCM13 1PH: not on the flood risk listCM13 1PL: not on the flood risk listCM13 1PN: not on the flood risk listCM13 1PP: not on the flood risk listCM13 1PR: not on the flood risk listCM13 1PS: not on the flood risk listCM13 1PT: not on the flood risk listCM13 1PW: not on the flood risk listCM13 1PX: not on the flood risk listCM13 1PY: not on the flood risk listCM13 1PZ: not on the flood risk listCM13 1QD: not on the flood risk listCM13 1QE: not on the flood risk listCM13 1QG: not on the flood risk listCM13 1QH: not on the flood risk listCM13 1QN: not on the flood risk listCM13 1QP: not on the flood risk listCM13 1QR: not on the flood risk listCM13 1QT: not on the flood risk listCM13 1QU: not on the flood risk listCM13 1QW: not on the flood risk listCM13 1QZ: not on the flood risk listCM13 1RB: not on the flood risk listCM13 1RF: not on the flood risk listCM13 1RG: not on the flood risk listCM13 1RH: not on the flood risk listCM13 1RJ: not on the flood risk listCM13 1RL: not on the flood risk listCM13 1RP: not on the flood risk listCM13 1RQ: not on the flood risk listCM13 1RS: not on the flood risk listCM13 1RT: not on the flood risk listCM13 1RU: not on the flood risk listCM13 1RX: not on the flood risk listCM13 1RZ: not on the flood risk listCM13 1SA: not on the flood risk listCM13 1SB: not on the flood risk listCM13 1SD: not on the flood risk listCM13 1SE: not on the flood risk listCM13 1SG: not on the flood risk listCM13 1SH: not on the flood risk listCM13 1SP: not on the flood risk listCM13 1SR: not on the flood risk listCM13 1SS: not on the flood risk listCM13 1ST: not on the flood risk listCM13 1SW: not on the flood risk listCM13 1SZ: not on the flood risk listCM13 1TB: not on the flood risk listCM13 1TE: not on the flood risk listCM13 1TF: not on the flood risk listCM13 1TG: not on the flood risk listCM13 1TH: not on the flood risk listCM13 1TJ: not on the flood risk listCM13 1TN: not on the flood risk listCM13 1UG: not on the flood risk listCM13 1UH: not on the flood risk listCM13 1UJ: not on the flood risk listCM13 1UL: not on the flood risk listCM13 1UN: not on the flood risk listCM13 1UR: not on the flood risk listCM13 1UT: not on the flood risk listCM13 1XA: not on the flood risk listCM13 1XD: not on the flood risk listCM13 1XG: not on the flood risk listCM13 1YE: not on the flood risk listCM13 1YF: not on the flood risk listCM13 1YG: not on the flood risk listCM13 1YH: not on the flood risk listCM13 1YJ: not on the flood risk listCM13 1YL: not on the flood risk listCM13 1YN: not on the flood risk listCM13 1YP: not on the flood risk listCM13 1YQ: not on the flood risk listCM13 1YR: not on the flood risk listCM13 1YS: not on the flood risk listCM13 1YT: not on the flood risk listCM13 1YU: not on the flood risk listCM13 1YW: not on the flood risk listCM13 1YZ: not on the flood risk listCM13 2AA: not on the flood risk listCM13 2AB: not on the flood risk listCM13 2AD: not on the flood risk listCM13 2AG: not on the flood risk listCM13 2AH: not on the flood risk listCM13 2AJ: not on the flood risk listCM13 2AP: not on the flood risk listCM13 2AQ: not on the flood risk listCM13 2AR: not on the flood risk listCM13 2AS: not on the flood risk listCM13 2AT: not on the flood risk listCM13 2AU: not on the flood risk listCM13 2AX: not on the flood risk listCM13 2AY: not on the flood risk listCM13 2AZ: not on the flood risk listCM13 2BA: not on the flood risk listCM13 2BB: not on the flood risk listCM13 2BG: not on the flood risk listCM13 2BJ: not on the flood risk listCM13 2BN: not on the flood risk listCM13 2BS: not on the flood risk listCM13 2BT: not on the flood risk listCM13 2BU: not on the flood risk listCM13 2BY: not on the flood risk listCM13 2BZ: not on the flood risk listCM13 2DA: not on the flood risk listCM13 2DB: not on the flood risk listCM13 2DD: not on the flood risk listCM13 2DE: not on the flood risk listCM13 2DP: not on the flood risk listCM13 2DQ: not on the flood risk listCM13 2DR: not on the flood risk listCM13 2DS: not on the flood risk listCM13 2DT: not on the flood risk listCM13 2DU: not on the flood risk listCM13 2DX: not on the flood risk listCM13 2DY: not on the flood risk listCM13 2DZ: not on the flood risk listCM13 2EB: not on the flood risk listCM13 2ED: not on the flood risk listCM13 2EE: not on the flood risk listCM13 2EH: not on the flood risk listCM13 2EJ: not on the flood risk listCM13 2EL: not on the flood risk listCM13 2EN: not on the flood risk listCM13 2EP: not on the flood risk listCM13 2EQ: not on the flood risk listCM13 2ER: not on the flood risk listCM13 2ES: not on the flood risk listCM13 2ET: not on the flood risk listCM13 2EU: not on the flood risk listCM13 2EW: not on the flood risk listCM13 2EX: not on the flood risk listCM13 2FA: not on the flood risk listCM13 2FB: not on the flood risk listCM13 2FD: not on the flood risk listCM13 2FE: not on the flood risk listCM13 2HD: not on the flood risk listCM13 2HE: not on the flood risk listCM13 2HF: not on the flood risk listCM13 2HG: not on the flood risk listCM13 2HH: not on the flood risk listCM13 2HJ: not on the flood risk listCM13 2HL: not on the flood risk listCM13 2HN: not on the flood risk listCM13 2HP: not on the flood risk listCM13 2HQ: not on the flood risk listCM13 2HR: not on the flood risk listCM13 2HS: not on the flood risk listCM13 2HT: not on the flood risk listCM13 2HW: not on the flood risk listCM13 2HX: not on the flood risk listCM13 2HY: not on the flood risk listCM13 2HZ: not on the flood risk listCM13 2JA: not on the flood risk listCM13 2JD: not on the flood risk listCM13 2JE: not on the flood risk listCM13 2JG: not on the flood risk listCM13 2JH: not on the flood risk listCM13 2JJ: not on the flood risk listCM13 2JL: not on the flood risk listCM13 2JN: not on the flood risk listCM13 2JP: not on the flood risk listCM13 2JR: not on the flood risk listCM13 2JS: not on the flood risk listCM13 2JT: not on the flood risk listCM13 2JW: not on the flood risk listCM13 2JX: not on the flood risk listCM13 2JY: not on the flood risk listCM13 2JZ: not on the flood risk listCM13 2LA: not on the flood risk listCM13 2LG: not on the flood risk listCM13 2LJ: not on the flood risk listCM13 2LL: not on the flood risk listCM13 2LN: not on the flood risk listCM13 2LP: not on the flood risk listCM13 2LQ: not on the flood risk listCM13 2LR: not on the flood risk listCM13 2LS: not on the flood risk listCM13 2LT: not on the flood risk listCM13 2LU: not on the flood risk listCM13 2LW: not on the flood risk listCM13 2LX: not on the flood risk listCM13 2LZ: not on the flood risk listCM13 2NA: not on the flood risk listCM13 2NB: not on the flood risk listCM13 2ND: not on the flood risk listCM13 2NE: not on the flood risk listCM13 2NF: not on the flood risk listCM13 2NG: not on the flood risk listCM13 2NJ: not on the flood risk listCM13 2NP: not on the flood risk listCM13 2NT: not on the flood risk listCM13 2NU: not on the flood risk listCM13 2NW: not on the flood risk listCM13 2NX: not on the flood risk listCM13 2NY: not on the flood risk listCM13 2NZ: not on the flood risk listCM13 2PA: not on the flood risk listCM13 2PB: not on the flood risk listCM13 2PD: not on the flood risk listCM13 2PE: not on the flood risk listCM13 2PF: not on the flood risk listCM13 2PG: not on the flood risk listCM13 2PL: not on the flood risk listCM13 2PN: not on the flood risk listCM13 2PP: not on the flood risk listCM13 2PR: not on the flood risk listCM13 2PS: not on the flood risk listCM13 2PT: not on the flood risk listCM13 2PW: not on the flood risk listCM13 2PX: not on the flood risk listCM13 2PY: not on the flood risk listCM13 2PZ: not on the flood risk listCM13 2QD: not on the flood risk listCM13 2QE: not on the flood risk listCM13 2QF: not on the flood risk listCM13 2QG: not on the flood risk listCM13 2QJ: not on the flood risk listCM13 2QL: not on the flood risk listCM13 2QN: not on the flood risk listCM13 2QP: not on the flood risk listCM13 2QQ: not on the flood risk listCM13 2QR: not on the flood risk listCM13 2QT: not on the flood risk listCM13 2QU: not on the flood risk listCM13 2QW: not on the flood risk listCM13 2QX: not on the flood risk listCM13 2QY: not on the flood risk listCM13 2QZ: not on the flood risk listCM13 2RA: not on the flood risk listCM13 2RF: not on the flood risk listCM13 2RG: not on the flood risk listCM13 2RJ: not on the flood risk listCM13 2RL: not on the flood risk listCM13 2RN: not on the flood risk listCM13 2RP: not on the flood risk listCM13 2RS: not on the flood risk listCM13 2RU: not on the flood risk listCM13 2RX: not on the flood risk listCM13 2RY: not on the flood risk listCM13 2RZ: not on the flood risk listCM13 2SA: not on the flood risk listCM13 2SD: not on the flood risk listCM13 2SE: not on the flood risk listCM13 2SF: not on the flood risk listCM13 2SG: not on the flood risk listCM13 2SH: not on the flood risk listCM13 2SJ: not on the flood risk listCM13 2SL: not on the flood risk listCM13 2SR: not on the flood risk listCM13 2ST: not on the flood risk listCM13 2SX: not on the flood risk listCM13 2SZ: not on the flood risk listCM13 2TB: not on the flood risk listCM13 2TD: not on the flood risk listCM13 2TH: not on the flood risk listCM13 2TJ: not on the flood risk listCM13 2TL: not on the flood risk listCM13 2TN: not on the flood risk listCM13 2TP: not on the flood risk listCM13 2TR: not on the flood risk listCM13 2TS: not on the flood risk listCM13 2TT: not on the flood risk listCM13 2TU: not on the flood risk listCM13 2UD: not on the flood risk listCM13 2UE: not on the flood risk listCM13 2UF: not on the flood risk listCM13 2UG: not on the flood risk listCM13 2UH: not on the flood risk listCM13 2UN: not on the flood risk listCM13 2UQ: not on the flood risk listCM13 2XA: not on the flood risk listCM13 2XB: not on the flood risk listCM13 3AA: not on the flood risk listCM13 3AB: not on the flood risk listCM13 3AD: not on the flood risk listCM13 3AE: not on the flood risk listCM13 3AG: not on the flood risk listCM13 3AH: not on the flood risk listCM13 3AL: not on the flood risk listCM13 3AP: not on the flood risk listCM13 3AQ: not on the flood risk listCM13 3AR: not on the flood risk listCM13 3AT: not on the flood risk listCM13 3AU: not on the flood risk listCM13 3AX: not on the flood risk listCM13 3AY: not on the flood risk listCM13 3BA: not on the flood risk listCM13 3BB: not on the flood risk listCM13 3BD: not on the flood risk listCM13 3BE: not on the flood risk listCM13 3BG: not on the flood risk listCM13 3BH: not on the flood risk listCM13 3BJ: not on the flood risk listCM13 3BL: not on the flood risk listCM13 3BN: not on the flood risk listCM13 3BP: not on the flood risk listCM13 3BU: not on the flood risk listCM13 3BY: not on the flood risk listCM13 3BZ: not on the flood risk listCM13 3DA: not on the flood risk listCM13 3DD: not on the flood risk listCM13 3DF: not on the flood risk listCM13 3DH: not on the flood risk listCM13 3DP: not on the flood risk listCM13 3DQ: not on the flood risk listCM13 3DR: not on the flood risk listCM13 3DS: not on the flood risk listCM13 3DT: not on the flood risk listCM13 3DX: not on the flood risk listCM13 3DZ: not on the flood risk listCM13 3EA: not on the flood risk listCM13 3EB: not on the flood risk listCM13 3ED: not on the flood risk listCM13 3EE: not on the flood risk listCM13 3EG: not on the flood risk listCM13 3EH: not on the flood risk listCM13 3EL: not on the flood risk listCM13 3EP: not on the flood risk listCM13 3EQ: not on the flood risk listCM13 3ES: not on the flood risk listCM13 3EU: not on the flood risk listCM13 3EX: not on the flood risk listCM13 3EZ: not on the flood risk listCM13 3FA: not on the flood risk listCM13 3FB: not on the flood risk listCM13 3FD: not on the flood risk listCM13 3FE: not on the flood risk listCM13 3FF: not on the flood risk listCM13 3FG: not on the flood risk listCM13 3FH: not on the flood risk listCM13 3FN: not on the flood risk listCM13 3FP: not on the flood risk listCM13 3FU: not on the flood risk listCM13 3FX: not on the flood risk listCM13 3FY: not on the flood risk listCM13 3GE: not on the flood risk listCM13 3GF: not on the flood risk listCM13 3GQ: not on the flood risk listCM13 3GT: not on the flood risk listCM13 3GU: not on the flood risk listCM13 3GW: not on the flood risk listCM13 3HA: not on the flood risk listCM13 3HD: not on the flood risk listCM13 3HG: not on the flood risk listCM13 3HH: not on the flood risk listCM13 3HJ: not on the flood risk listCM13 3HR: not on the flood risk listCM13 3HS: not on the flood risk listCM13 3HT: not on the flood risk listCM13 3HU: not on the flood risk listCM13 3HW: not on the flood risk listCM13 3HX: not on the flood risk listCM13 3HZ: not on the flood risk listCM13 3JA: not on the flood risk listCM13 3JB: not on the flood risk listCM13 3JD: not on the flood risk listCM13 3JE: not on the flood risk listCM13 3JH: not on the flood risk listCM13 3JJ: not on the flood risk listCM13 3JL: not on the flood risk listCM13 3JN: not on the flood risk listCM13 3JP: not on the flood risk listCM13 3JR: not on the flood risk listCM13 3JS: not on the flood risk listCM13 3JU: not on the flood risk listCM13 3JW: not on the flood risk listCM13 3JX: not on the flood risk listCM13 3JZ: not on the flood risk listCM13 3LA: not on the flood risk listCM13 3LB: not on the flood risk listCM13 3LD: not on the flood risk listCM13 3LE: not on the flood risk listCM13 3LH: not on the flood risk listCM13 3LJ: not on the flood risk listCM13 3LL: not on the flood risk listCM13 3LN: not on the flood risk listCM13 3LP: not on the flood risk listCM13 3LR: not on the flood risk listCM13 3LS: not on the flood risk listCM13 3LU: not on the flood risk listCM13 3LZ: not on the flood risk listCM13 3NA: not on the flood risk listCM13 3NB: not on the flood risk listCM13 3ND: not on the flood risk listCM13 3NE: not on the flood risk listCM13 3NF: not on the flood risk listCM13 3NG: not on the flood risk listCM13 3NH: not on the flood risk listCM13 3NL: not on the flood risk listCM13 3NN: not on the flood risk listCM13 3NQ: not on the flood risk listCM13 3NS: not on the flood risk listCM13 3NT: not on the flood risk listCM13 3NU: not on the flood risk listCM13 3NX: not on the flood risk listCM13 3NY: not on the flood risk listCM13 3NZ: not on the flood risk listCM13 3PA: not on the flood risk listCM13 3PB: not on the flood risk listCM13 3PD: not on the flood risk listCM13 3PE: not on the flood risk listCM13 3PF: not on the flood risk listCM13 3PG: not on the flood risk listCM13 3PH: not on the flood risk listCM13 3PJ: not on the flood risk listCM13 3PL: not on the flood risk listCM13 3PN: not on the flood risk listCM13 3PP: not on the flood risk listCM13 3PR: not on the flood risk listCM13 3PS: not on the flood risk listCM13 3PT: not on the flood risk listCM13 3PU: not on the flood risk listCM13 3PX: not on the flood risk listCM13 3PZ: not on the flood risk listCM13 3QB: not on the flood risk listCM13 3QH: not on the flood risk listCM13 3QJ: not on the flood risk listCM13 3QL: not on the flood risk listCM13 3QN: not on the flood risk listCM13 3QP: not on the flood risk listCM13 3QS: not on the flood risk listCM13 3QT: not on the flood risk listCM13 3QU: not on the flood risk listCM13 3QX: not on the flood risk listCM13 3QY: not on the flood risk listCM13 3RA: not on the flood risk listCM13 3RB: not on the flood risk listCM13 3RD: not on the flood risk listCM13 3RE: not on the flood risk listCM13 3RG: not on the flood risk listCM13 3RH: not on the flood risk listCM13 3RJ: not on the flood risk listCM13 3RL: not on the flood risk listCM13 3RP: not on the flood risk listCM13 3RQ: not on the flood risk listCM13 3RR: not on the flood risk listCM13 3RS: not on the flood risk listCM13 3RU: not on the flood risk listCM13 3RW: not on the flood risk listCM13 3RZ: not on the flood risk listCM13 3SA: not on the flood risk listCM13 3SB: not on the flood risk listCM13 3SD: not on the flood risk listCM13 3SE: not on the flood risk listCM13 3SG: not on the flood risk listCM13 3SH: not on the flood risk listCM13 3SJ: not on the flood risk listCM13 3SL: not on the flood risk listCM13 3SN: not on the flood risk listCM13 3SP: not on the flood risk listCM13 3SR: not on the flood risk listCM13 3SU: not on the flood risk listCM13 3SW: not on the flood risk listCM13 3SX: not on the flood risk listCM13 3SY: not on the flood risk listCM13 3TA: not on the flood risk listCM13 3TD: not on the flood risk listCM13 3TG: not on the flood risk listCM13 3TL: not on the flood risk listCM13 3TN: not on the flood risk listCM13 3TP: not on the flood risk listCM13 3TQ: not on the flood risk listCM13 3TR: not on the flood risk listCM13 3TS: not on the flood risk listCM13 3TT: not on the flood risk listCM13 3TU: not on the flood risk listCM13 3TX: not on the flood risk listCM13 3UA: not on the flood risk listCM13 3UJ: not on the flood risk listCM13 3UL: not on the flood risk listCM13 3XD: not on the flood risk listCM13 3YD: not on the flood risk listCM13 1SJ: low flood risk at worstCM13 1SN: low flood risk at worstCM13 3QW: low flood risk at worstCM13 1AE: medium flood risk at worstCM13 2NL: medium flood risk at worstCM13 1AB: high flood riskCM13 1AY: high flood riskCM13 1AG: high flood riskCM13 1DT: high flood riskCM13 1DY: high flood riskCM13 1DZ: high flood riskCM13 1SL: high flood riskCM13 1UP: high flood riskCM13 2NN: high flood riskCM13 2NS: high flood riskCM13 3EN: high flood riskCM13 3HE: high flood riskCM13 3LT: high flood riskCM13 3LW: high flood riskCM13 3LX: high flood riskCM13 3SS: high flood risk Brentwood 8 postcodes at high or medium risk, outlined: this goes to CM13 1AG, the one with most homes and businesses at high risk8 postcodes at high or medium risk Map of every postcode in CM13, by flood risk Of the 702 postcodes in CM13 that ONS places, 16 have a home or business at high risk, 3 are at medium risk at worst, 3 are at low risk at worst and 680 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 8 postcodes at high or medium risk. Places named: Brentwood. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A12A1023 Brentwood 8 postcodes at high or medium risk, outlined: this goes to CM13 1AG, the one with most homes and businesses at high risk8 postcodes at high or medium risk
  • A home or business at high risk: 16
  • At medium risk at worst: 3
  • At low risk at worst: 3
  • At very low risk only: 0
  • Not on the at-risk list: 680
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 702 postcodes in CM13 that ONS places, 16 have a home or business at high risk, 3 are at medium risk at worst, 3 are at low risk at worst and 680 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 51.6150, longitude 0.3383. 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

16 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.

CM13 1AG33 at high riskCM13 1AY14 at high riskCM13 1AB9 at high riskCM13 3HE5 at high riskCM13 1DZ4 at high riskCM13 3LW1 at high riskCM13 2NN1 at high riskCM13 1DT1 at high riskCM13 1DY1 at high riskCM13 1SL1 at high riskCM13 1UP1 at high riskCM13 2NS1 at high risk

Where the postcodes at high or medium risk lie together

  • 8 postcodes at high or medium risk, outlined on the map. CM13 1AG, is the one with most homes and businesses at high risk.

What broadband can you get in CM13?

Ofcom reports on 692 of the 702 postcodes in CM13. At 491 of them every home and business can get gigabit broadband, and at 2 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit491 of 692
Postcodes where every home can get superfast642 of 692
Postcodes where some cannot get decent broadband2 of 692

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 CM13 at risk of flooding?

22 of the 702 postcodes in CM13 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 103 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 22 of 702 postcodes High: 76Medium: 27Low: 39

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 CM13?

Homes in CM13 sold for a typical £530,000 in the 12 months to August 2026, across 303 sales, up 9.3% on the 12 months before, HM Land Registry's figures show.

£530,000 typical price, the 12 months to August 2026
12 months to August 2025
£485,000
12 months to August 2026
£530,000

▲ up 9.3% on the 12 months before

Detached£910,000 107 sales
Semi-detached£510,000 105 sales
Terraced£410,000 53 sales
Flat or maisonette£275,000 38 sales

Standard sales of homes at market value. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.

Source: HM Land Registry Price Paid Data, files dated 28 September 2026. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0. How we use it

Postcodes in CM13

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

CM13 1236 postcodesCM13 2228 postcodesCM13 3238 postcodes
UK postcode format explained

Places in CM13

Towns and villages with postcodes in CM13, and how many each has here.

Brentwood postcodes,502Basildon postcodes,2Havering postcodes,1

Who covers CM13

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

  • Brentwood and Ongar679
  • Basildon and Billericay15
  • South Basildon and East Thurrock7
  • Hornchurch and Upminster1

Police force areas

  • Essex701
  • Metropolitan Police1

Next to CM13

CM12 postcode district CM14 postcode district All CM districts Brentwood postcodes

"Next to" is by number: the districts before and after CM13 in the CM area.

Check a postcode

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