CM23 postcode district: Bishop's Stortford and around

CM23 is a postcode district mostly in Hertfordshire, with 1,200 postcodes in use in 7 sectors. It has postcodes in Bishop's Stortford and Stansted Mountfitchet. It is split between 2 councils: East Hertfordshire (1,100 postcodes) and Uttlesford (100). 1,100 are in Hertfordshire and 100 in Essex.

Postcodes in use
1,200
Sectors
7
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 CM23, by flood risk

Map of every postcode in CM23, by flood risk Of the 1,200 postcodes in CM23 that ONS places, 39 have a home or business at high risk, 12 are at medium risk at worst, 64 are at low risk at worst and 1,085 are not on the Environment Agency's at-risk list. 3 groups of postcodes at high or medium risk are outlined: 19 postcodes at high or medium risk; 13 postcodes at high or medium risk; 8 postcodes at high or medium risk. Places named: Bishop's Stortford, Stansted Mountfitchet, Elsenham, Burton End. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. M11A1060A120 CM23 0AA: not on the flood risk listCM23 0AB: not on the flood risk listCM23 0AH: not on the flood risk listCM23 0AN: not on the flood risk listCM23 0AP: not on the flood risk listCM23 0AT: not on the flood risk listCM23 0AU: not on the flood risk listCM23 0AW: not on the flood risk listCM23 0AZ: not on the flood risk listCM23 0BA: not on the flood risk listCM23 0BD: not on the flood risk listCM23 0BF: not on the flood risk listCM23 0BJ: not on the flood risk listCM23 0BL: not on the flood risk listCM23 0BN: not on the flood risk listCM23 0BR: not on the flood risk listCM23 0BT: not on the flood risk listCM23 0BU: not on the flood risk listCM23 0BZ: not on the flood risk listCM23 0DA: not on the flood risk listCM23 0DL: not on the flood risk listCM23 1AA: not on the flood risk listCM23 1AB: not on the flood risk listCM23 1AD: not on the flood risk listCM23 1AE: not on the flood risk listCM23 1AG: not on the flood risk listCM23 1AH: not on the flood risk listCM23 1AJ: not on the flood risk listCM23 1AL: not on the flood risk listCM23 1AN: not on the flood risk listCM23 1AP: not on the flood risk listCM23 1AR: not on the flood risk listCM23 1AS: not on the flood risk listCM23 1AT: not on the flood risk listCM23 1AU: not on the flood risk listCM23 1AW: not on the flood risk listCM23 1AX: not on the flood risk listCM23 1AY: not on the flood risk listCM23 1AZ: not on the flood risk listCM23 1BA: not on the flood risk listCM23 1BB: not on the flood risk listCM23 1BD: not on the flood risk listCM23 1BE: not on the flood risk listCM23 1BJ: not on the flood risk listCM23 1BL: not on the flood risk listCM23 1BN: not on the flood risk listCM23 1BP: not on the flood risk listCM23 1BQ: not on the flood risk listCM23 1BS: not on the flood risk listCM23 1BT: not on the flood risk listCM23 1BW: not on the flood risk listCM23 1DB: not on the flood risk listCM23 1DG: not on the flood risk listCM23 1DH: not on the flood risk listCM23 1DL: not on the flood risk listCM23 1DP: not on the flood risk listCM23 1DR: not on the flood risk listCM23 1DS: not on the flood risk listCM23 1DT: not on the flood risk listCM23 1DU: not on the flood risk listCM23 1EA: not on the flood risk listCM23 1EF: not on the flood risk listCM23 1EG: not on the flood risk listCM23 1EH: not on the flood risk listCM23 1EL: not on the flood risk listCM23 1EN: not on the flood risk listCM23 1ER: not on the flood risk listCM23 1ET: not on the flood risk listCM23 1EU: not on the flood risk listCM23 1EW: not on the flood risk listCM23 1FA: not on the flood risk listCM23 1FD: not on the flood risk listCM23 1FF: not on the flood risk listCM23 1FG: not on the flood risk listCM23 1FL: not on the flood risk listCM23 1FU: not on the flood risk listCM23 1FW: not on the flood risk listCM23 1FX: not on the flood risk listCM23 1GD: not on the flood risk listCM23 1GE: not on the flood risk listCM23 1GH: not on the flood risk listCM23 1GN: not on the flood risk listCM23 1GR: not on the flood risk listCM23 1GS: not on the flood risk listCM23 1GU: not on the flood risk listCM23 1HA: not on the flood risk listCM23 1HB: not on the flood risk listCM23 1HD: not on the flood risk listCM23 1HE: not on the flood risk listCM23 1HG: not on the flood risk listCM23 1HH: not on the flood risk listCM23 1HJ: not on the flood risk listCM23 1HL: not on the flood risk listCM23 1HN: not on the flood risk listCM23 1HP: not on the flood risk listCM23 1HR: not on the flood risk listCM23 1HS: not on the flood risk listCM23 1HT: not on the flood risk listCM23 1HW: not on the flood risk listCM23 1HX: not on the flood risk listCM23 1HY: not on the flood risk listCM23 1HZ: not on the flood risk listCM23 1JA: not on the flood risk listCM23 1JF: not on the flood risk listCM23 1JG: not on the flood risk listCM23 1JJ: not on the flood risk listCM23 1JR: not on the flood risk listCM23 1JU: not on the flood risk listCM23 2AA: not on the flood risk listCM23 2AB: not on the flood risk listCM23 2AD: not on the flood risk listCM23 2AF: not on the flood risk listCM23 2AG: not on the flood risk listCM23 2AL: not on the flood risk listCM23 2AP: not on the flood risk listCM23 2AS: not on the flood risk listCM23 2AW: not on the flood risk listCM23 2AX: not on the flood risk listCM23 2AY: not on the flood risk listCM23 2AZ: not on the flood risk listCM23 2BA: not on the flood risk listCM23 2BD: not on the flood risk listCM23 2BG: not on the flood risk listCM23 2BH: not on the flood risk listCM23 2BL: not on the flood risk listCM23 2BT: not on the flood risk listCM23 2BU: not on the flood risk listCM23 2BX: not on the flood risk listCM23 2BY: not on the flood risk listCM23 2DB: not on the flood risk listCM23 2DD: not on the flood risk listCM23 2DH: not on the flood risk listCM23 2DS: not on the flood risk listCM23 2DT: not on the flood risk listCM23 2DU: not on the flood risk listCM23 2DX: not on the flood risk listCM23 2DY: not on the flood risk listCM23 2DZ: not on the flood risk listCM23 2ET: not on the flood risk listCM23 2EZ: not on the flood risk listCM23 2FB: not on the flood risk listCM23 2FG: not on the flood risk listCM23 2FN: not on the flood risk listCM23 2FQ: not on the flood risk listCM23 2FR: not on the flood risk listCM23 2FT: not on the flood risk listCM23 2FU: not on the flood risk listCM23 2FW: not on the flood risk listCM23 2GE: not on the flood risk listCM23 2GH: not on the flood risk listCM23 2GL: not on the flood risk listCM23 2GN: not on the flood risk listCM23 2GP: not on the flood risk listCM23 2GS: not on the flood risk listCM23 2GT: not on the flood risk listCM23 2GU: not on the flood risk listCM23 2GZ: not on the flood risk listCM23 2HB: not on the flood risk listCM23 2HE: not on the flood risk listCM23 2HP: not on the flood risk listCM23 2HX: not on the flood risk listCM23 2HY: not on the flood risk listCM23 2JA: not on the flood risk listCM23 2JB: not on the flood risk listCM23 2JJ: not on the flood risk listCM23 2JL: not on the flood risk listCM23 2JN: not on the flood risk listCM23 2JR: not on the flood risk listCM23 2JT: not on the flood risk listCM23 2LS: not on the flood risk listCM23 2LY: not on the flood risk listCM23 2NB: not on the flood risk listCM23 2ND: not on the flood risk listCM23 2NE: not on the flood risk listCM23 2NG: not on the flood risk listCM23 2NH: not on the flood risk listCM23 2NJ: not on the flood risk listCM23 2NL: not on the flood risk listCM23 2NN: not on the flood risk listCM23 2NP: not on the flood risk listCM23 2NQ: not on the flood risk listCM23 2NT: not on the flood risk listCM23 2NU: not on the flood risk listCM23 2NX: not on the flood risk listCM23 2PA: not on the flood risk listCM23 2PB: not on the flood risk listCM23 2PD: not on the flood risk listCM23 2PE: not on the flood risk listCM23 2PF: not on the flood risk listCM23 2PG: not on the flood risk listCM23 2PH: not on the flood risk listCM23 2PJ: not on the flood risk listCM23 2PL: not on the flood risk listCM23 2PN: not on the flood risk listCM23 2PQ: not on the flood risk listCM23 2PR: not on the flood risk listCM23 2PS: not on the flood risk listCM23 2PT: not on the flood risk listCM23 2PW: not on the flood risk listCM23 2PX: not on the flood risk listCM23 2PY: not on the flood risk listCM23 2QA: not on the flood risk listCM23 2QD: not on the flood risk listCM23 2QE: not on the flood risk listCM23 2QF: not on the flood risk listCM23 2QG: not on the flood risk listCM23 2QR: not on the flood risk listCM23 2QT: not on the flood risk listCM23 2QX: not on the flood risk listCM23 2RB: not on the flood risk listCM23 2RD: not on the flood risk listCM23 2RE: not on the flood risk listCM23 2RG: not on the flood risk listCM23 2RH: not on the flood risk listCM23 2RL: not on the flood risk listCM23 2RN: not on the flood risk listCM23 2RP: not on the flood risk listCM23 2RS: not on the flood risk listCM23 2RT: not on the flood risk listCM23 2RU: not on the flood risk listCM23 2RW: not on the flood risk listCM23 2RY: not on the flood risk listCM23 2SB: not on the flood risk listCM23 2SD: not on the flood risk listCM23 2SE: not on the flood risk listCM23 2SF: not on the flood risk listCM23 2SG: not on the flood risk listCM23 2SL: not on the flood risk listCM23 2SP: not on the flood risk listCM23 2SQ: not on the flood risk listCM23 2SR: not on the flood risk listCM23 2SY: not on the flood risk listCM23 2SZ: not on the flood risk listCM23 2TA: not on the flood risk listCM23 2TB: not on the flood risk listCM23 2TD: not on the flood risk listCM23 2TF: not on the flood risk listCM23 2TH: not on the flood risk listCM23 2TU: not on the flood risk listCM23 2UD: not on the flood risk listCM23 2UT: not on the flood risk listCM23 2UU: not on the flood risk listCM23 2UW: not on the flood risk listCM23 2UY: not on the flood risk listCM23 2UZ: not on the flood risk listCM23 2WL: not on the flood risk listCM23 2WP: not on the flood risk listCM23 2XD: not on the flood risk listCM23 2XE: not on the flood risk listCM23 2XJ: not on the flood risk listCM23 2XL: not on the flood risk listCM23 2XN: not on the flood risk listCM23 2XQ: not on the flood risk listCM23 2XW: not on the flood risk listCM23 2YD: not on the flood risk listCM23 2YE: not on the flood risk listCM23 2YF: not on the flood risk listCM23 2YG: not on the flood risk listCM23 2YH: not on the flood risk listCM23 2YN: not on the flood risk listCM23 2YR: not on the flood risk listCM23 2YS: not on the flood risk listCM23 2YU: not on the flood risk listCM23 2YX: not on the flood risk listCM23 2ZE: not on the flood risk listCM23 2ZF: not on the flood risk listCM23 2ZH: not on the flood risk listCM23 2ZJ: not on the flood risk listCM23 2ZL: not on the flood risk listCM23 2ZR: not on the flood risk listCM23 3AW: not on the flood risk listCM23 3BE: not on the flood risk listCM23 3BQ: not on the flood risk listCM23 3DZ: not on the flood risk listCM23 3EB: not on the flood risk listCM23 3EE: not on the flood risk listCM23 3EH: not on the flood risk listCM23 3EJ: not on the flood risk listCM23 3EL: not on the flood risk listCM23 3EN: not on the flood risk listCM23 3EP: not on the flood risk listCM23 3ER: not on the flood risk listCM23 3ET: not on the flood risk listCM23 3EU: not on the flood risk listCM23 3EX: not on the flood risk listCM23 3EY: not on the flood risk listCM23 3FD: not on the flood risk listCM23 3FP: not on the flood risk listCM23 3FU: not on the flood risk listCM23 3GB: not on the flood risk listCM23 3GH: not on the flood risk listCM23 3GR: not on the flood risk listCM23 3GU: not on the flood risk listCM23 3GW: not on the flood risk listCM23 3GX: not on the flood risk listCM23 3GY: not on the flood risk listCM23 3HD: not on the flood risk listCM23 3HE: not on the flood risk listCM23 3HF: not on the flood risk listCM23 3HJ: not on the flood risk listCM23 3HL: not on the flood risk listCM23 3HN: not on the flood risk listCM23 3HP: not on the flood risk listCM23 3HT: not on the flood risk listCM23 3JT: not on the flood risk listCM23 3JU: not on the flood risk listCM23 3JY: not on the flood risk listCM23 3JZ: not on the flood risk listCM23 3LH: not on the flood risk listCM23 3LR: not on the flood risk listCM23 3LU: not on the flood risk listCM23 3LY: not on the flood risk listCM23 3LZ: not on the flood risk listCM23 3NB: not on the flood risk listCM23 3ND: not on the flood risk listCM23 3NF: not on the flood risk listCM23 3NG: not on the flood risk listCM23 3NH: not on the flood risk listCM23 3NJ: not on the flood risk listCM23 3NN: not on the flood risk listCM23 3NP: not on the flood risk listCM23 3NR: not on the flood risk listCM23 3NX: not on the flood risk listCM23 3PB: not on the flood risk listCM23 3PD: not on the flood risk listCM23 3PE: not on the flood risk listCM23 3PH: not on the flood risk listCM23 3PJ: not on the flood risk listCM23 3PL: not on the flood risk listCM23 3PN: not on the flood risk listCM23 3PS: not on the flood risk listCM23 3PT: not on the flood risk listCM23 3PU: not on the flood risk listCM23 3PX: not on the flood risk listCM23 3PY: not on the flood risk listCM23 3QB: not on the flood risk listCM23 3QD: not on the flood risk listCM23 3QE: not on the flood risk listCM23 3QF: not on the flood risk listCM23 3QG: not on the flood risk listCM23 3QH: not on the flood risk listCM23 3QJ: not on the flood risk listCM23 3QL: not on the flood risk listCM23 3QP: not on the flood risk listCM23 3QQ: not on the flood risk listCM23 3QR: not on the flood risk listCM23 3QS: not on the flood risk listCM23 3QT: not on the flood risk listCM23 3QU: not on the flood risk listCM23 3RE: not on the flood risk listCM23 3RH: not on the flood risk listCM23 3RP: not on the flood risk listCM23 3RU: not on the flood risk listCM23 3RW: not on the flood risk listCM23 3SB: not on the flood risk listCM23 3SL: not on the flood risk listCM23 3SN: not on the flood risk listCM23 3SP: not on the flood risk listCM23 3SQ: not on the flood risk listCM23 3SS: not on the flood risk listCM23 3SY: not on the flood risk listCM23 3TG: not on the flood risk listCM23 3TP: not on the flood risk listCM23 3TQ: not on the flood risk listCM23 3TR: not on the flood risk listCM23 3UD: not on the flood risk listCM23 3UJ: not on the flood risk listCM23 4AA: not on the flood risk listCM23 4AB: not on the flood risk listCM23 4AE: not on the flood risk listCM23 4AG: not on the flood risk listCM23 4AJ: not on the flood risk listCM23 4AL: not on the flood risk listCM23 4AN: not on the flood risk listCM23 4AP: not on the flood risk listCM23 4AS: not on the flood risk listCM23 4AT: not on the flood risk listCM23 4AZ: not on the flood risk listCM23 4BB: not on the flood risk listCM23 4BD: not on the flood risk listCM23 4BE: not on the flood risk listCM23 4BG: not on the flood risk listCM23 4BH: not on the flood risk listCM23 4BJ: not on the flood risk listCM23 4BL: not on the flood risk listCM23 4BN: not on the flood risk listCM23 4BP: not on the flood risk listCM23 4BQ: not on the flood risk listCM23 4BS: not on the flood risk listCM23 4BT: not on the flood risk listCM23 4BU: not on the flood risk listCM23 4BW: not on the flood risk listCM23 4BX: not on the flood risk listCM23 4BY: not on the flood risk listCM23 4BZ: not on the flood risk listCM23 4DD: not on the flood risk listCM23 4DE: not on the flood risk listCM23 4DG: not on the flood risk listCM23 4DH: not on the flood risk listCM23 4DJ: not on the flood risk listCM23 4DL: not on the flood risk listCM23 4DN: not on the flood risk listCM23 4DP: not on the flood risk listCM23 4DQ: not on the flood risk listCM23 4DR: not on the flood risk listCM23 4DS: not on the flood risk listCM23 4DU: not on the flood risk listCM23 4DX: not on the flood risk listCM23 4DY: not on the flood risk listCM23 4EA: not on the flood risk listCM23 4EB: not on the flood risk listCM23 4ED: not on the flood risk listCM23 4EE: not on the flood risk listCM23 4EG: not on the flood risk listCM23 4EH: not on the flood risk listCM23 4EJ: not on the flood risk listCM23 4EL: not on the flood risk listCM23 4EN: not on the flood risk listCM23 4EP: not on the flood risk listCM23 4ER: not on the flood risk listCM23 4ES: not on the flood risk listCM23 4ET: not on the flood risk listCM23 4EU: not on the flood risk listCM23 4EW: not on the flood risk listCM23 4EY: not on the flood risk listCM23 4FE: not on the flood risk listCM23 4FF: not on the flood risk listCM23 4FG: not on the flood risk listCM23 4FH: not on the flood risk listCM23 4FL: not on the flood risk listCM23 4FN: not on the flood risk listCM23 4FQ: not on the flood risk listCM23 4FR: not on the flood risk listCM23 4FS: not on the flood risk listCM23 4FT: not on the flood risk listCM23 4FW: not on the flood risk listCM23 4FX: not on the flood risk listCM23 4FY: not on the flood risk listCM23 4GA: not on the flood risk listCM23 4GB: not on the flood risk listCM23 4GF: not on the flood risk listCM23 4GG: not on the flood risk listCM23 4GH: not on the flood risk listCM23 4GJ: not on the flood risk listCM23 4GP: not on the flood risk listCM23 4GZ: not on the flood risk listCM23 4HB: not on the flood risk listCM23 4HD: not on the flood risk listCM23 4HE: not on the flood risk listCM23 4HG: not on the flood risk listCM23 4HH: not on the flood risk listCM23 4HJ: not on the flood risk listCM23 4HL: not on the flood risk listCM23 4HN: not on the flood risk listCM23 4HP: not on the flood risk listCM23 4HR: not on the flood risk listCM23 4HS: not on the flood risk listCM23 4HW: not on the flood risk listCM23 4JB: not on the flood risk listCM23 4JD: not on the flood risk listCM23 4JF: not on the flood risk listCM23 4JG: not on the flood risk listCM23 4JH: not on the flood risk listCM23 4JJ: not on the flood risk listCM23 4JL: not on the flood risk listCM23 4JN: not on the flood risk listCM23 4JP: not on the flood risk listCM23 4JR: not on the flood risk listCM23 4JS: not on the flood risk listCM23 4JT: not on the flood risk listCM23 4JU: not on the flood risk listCM23 4JW: not on the flood risk listCM23 4JX: not on the flood risk listCM23 4JY: not on the flood risk listCM23 4JZ: not on the flood risk listCM23 4LE: not on the flood risk listCM23 4LF: not on the flood risk listCM23 4LH: not on the flood risk listCM23 4LN: not on the flood risk listCM23 4LT: not on the flood risk listCM23 4LU: not on the flood risk listCM23 4LY: not on the flood risk listCM23 4LZ: not on the flood risk listCM23 4NB: not on the flood risk listCM23 4NX: not on the flood risk listCM23 4NZ: not on the flood risk listCM23 4PA: not on the flood risk listCM23 4PB: not on the flood risk listCM23 4PD: not on the flood risk listCM23 4PE: not on the flood risk listCM23 4PF: not on the flood risk listCM23 4PH: not on the flood risk listCM23 4PJ: not on the flood risk listCM23 4PL: not on the flood risk listCM23 4PP: not on the flood risk listCM23 4PR: not on the flood risk listCM23 4PT: not on the flood risk listCM23 4PU: not on the flood risk listCM23 4PX: not on the flood risk listCM23 4PY: not on the flood risk listCM23 4QE: not on the flood risk listCM23 4QF: not on the flood risk listCM23 4QG: not on the flood risk listCM23 4QN: not on the flood risk listCM23 4QQ: not on the flood risk listCM23 4QZ: not on the flood risk listCM23 4RB: not on the flood risk listCM23 4RE: not on the flood risk listCM23 4RF: not on the flood risk listCM23 4RG: not on the flood risk listCM23 4RH: not on the flood risk listCM23 4RJ: not on the flood risk listCM23 4RL: not on the flood risk listCM23 4RN: not on the flood risk listCM23 4RP: not on the flood risk listCM23 4RR: not on the flood risk listCM23 4RW: not on the flood risk listCM23 4RX: not on the flood risk listCM23 4SA: not on the flood risk listCM23 4SD: not on the flood risk listCM23 4SE: not on the flood risk listCM23 4SH: not on the flood risk listCM23 4SL: not on the flood risk listCM23 4SP: not on the flood risk listCM23 4SX: not on the flood risk listCM23 4SY: not on the flood risk listCM23 4SZ: not on the flood risk listCM23 4TA: not on the flood risk listCM23 4TB: not on the flood risk listCM23 4TD: not on the flood risk listCM23 4TG: not on the flood risk listCM23 4TJ: not on the flood risk listCM23 4TL: not on the flood risk listCM23 4TN: not on the flood risk listCM23 4TR: not on the flood risk listCM23 5AA: not on the flood risk listCM23 5AB: not on the flood risk listCM23 5AD: not on the flood risk listCM23 5AF: not on the flood risk listCM23 5AG: not on the flood risk listCM23 5AJ: not on the flood risk listCM23 5AL: not on the flood risk listCM23 5AT: not on the flood risk listCM23 5BA: not on the flood risk listCM23 5BB: not on the flood risk listCM23 5BD: not on the flood risk listCM23 5BE: not on the flood risk listCM23 5BG: not on the flood risk listCM23 5BH: not on the flood risk listCM23 5BL: not on the flood risk listCM23 5BP: not on the flood risk listCM23 5BQ: not on the flood risk listCM23 5BS: not on the flood risk listCM23 5BU: not on the flood risk listCM23 5BY: not on the flood risk listCM23 5BZ: not on the flood risk listCM23 5DD: not on the flood risk listCM23 5DE: not on the flood risk listCM23 5DF: not on the flood risk listCM23 5DG: not on the flood risk listCM23 5DJ: not on the flood risk listCM23 5DL: not on the flood risk listCM23 5DN: not on the flood risk listCM23 5DP: not on the flood risk listCM23 5DQ: not on the flood risk listCM23 5DR: not on the flood risk listCM23 5DS: not on the flood risk listCM23 5DT: not on the flood risk listCM23 5DW: not on the flood risk listCM23 5DY: not on the flood risk listCM23 5EB: not on the flood risk listCM23 5EF: not on the flood risk listCM23 5EL: not on the flood risk listCM23 5EN: not on the flood risk listCM23 5ER: not on the flood risk listCM23 5ES: not on the flood risk listCM23 5ET: not on the flood risk listCM23 5EU: not on the flood risk listCM23 5EX: not on the flood risk listCM23 5FD: not on the flood risk listCM23 5FE: not on the flood risk listCM23 5FF: not on the flood risk listCM23 5FG: not on the flood risk listCM23 5FH: not on the flood risk listCM23 5FL: not on the flood risk listCM23 5FR: not on the flood risk listCM23 5FS: not on the flood risk listCM23 5FT: not on the flood risk listCM23 5FU: not on the flood risk listCM23 5GB: not on the flood risk listCM23 5GN: not on the flood risk listCM23 5GP: not on the flood risk listCM23 5GW: not on the flood risk listCM23 5GY: not on the flood risk listCM23 5HF: not on the flood risk listCM23 5HH: not on the flood risk listCM23 5HN: not on the flood risk listCM23 5HP: not on the flood risk listCM23 5HR: not on the flood risk listCM23 5HS: not on the flood risk listCM23 5HT: not on the flood risk listCM23 5HU: not on the flood risk listCM23 5HW: not on the flood risk listCM23 5HX: not on the flood risk listCM23 5JD: not on the flood risk listCM23 5JE: not on the flood risk listCM23 5JF: not on the flood risk listCM23 5JG: not on the flood risk listCM23 5JH: not on the flood risk listCM23 5JJ: not on the flood risk listCM23 5JL: not on the flood risk listCM23 5JP: not on the flood risk listCM23 5JQ: not on the flood risk listCM23 5JR: not on the flood risk listCM23 5JS: not on the flood risk listCM23 5JT: not on the flood risk listCM23 5JX: not on the flood risk listCM23 5LB: not on the flood risk listCM23 5LD: not on the flood risk listCM23 5LF: not on the flood risk listCM23 5LG: not on the flood risk listCM23 5LH: not on the flood risk listCM23 5LL: not on the flood risk listCM23 5LN: not on the flood risk listCM23 5LP: not on the flood risk listCM23 5LQ: not on the flood risk listCM23 5LR: not on the flood risk listCM23 5LS: not on the flood risk listCM23 5LT: not on the flood risk listCM23 5NF: not on the flood risk listCM23 5NG: not on the flood risk listCM23 5NH: not on the flood risk listCM23 5NJ: not on the flood risk listCM23 5NL: not on the flood risk listCM23 5NN: not on the flood risk listCM23 5NP: not on the flood risk listCM23 5NQ: not on the flood risk listCM23 5NR: not on the flood risk listCM23 5NS: not on the flood risk listCM23 5NT: not on the flood risk listCM23 5PA: not on the flood risk listCM23 5PB: not on the flood risk listCM23 5PD: not on the flood risk listCM23 5PJ: not on the flood risk listCM23 5PP: not on the flood risk listCM23 5PR: not on the flood risk listCM23 5PS: not on the flood risk listCM23 5PT: not on the flood risk listCM23 5PU: not on the flood risk listCM23 5PW: not on the flood risk listCM23 5PX: not on the flood risk listCM23 5PZ: not on the flood risk listCM23 5QA: not on the flood risk listCM23 5QF: not on the flood risk listCM23 5QG: not on the flood risk listCM23 5QH: not on the flood risk listCM23 5QJ: not on the flood risk listCM23 5QL: not on the flood risk listCM23 5QN: not on the flood risk listCM23 5QP: not on the flood risk listCM23 5QQ: not on the flood risk listCM23 5QR: not on the flood risk listCM23 5QS: not on the flood risk listCM23 5QT: not on the flood risk listCM23 5QU: not on the flood risk listCM23 5QX: not on the flood risk listCM23 5QY: not on the flood risk listCM23 5QZ: not on the flood risk listCM23 5RA: not on the flood risk listCM23 5RB: not on the flood risk listCM23 5RE: not on the flood risk listCM23 5RG: not on the flood risk listCM23 5RN: not on the flood risk listCM23 5SN: not on the flood risk listCM23 5TB: not on the flood risk listCM23 1BG: low flood risk at worstCM23 1DA: low flood risk at worstCM23 1DJ: low flood risk at worstCM23 1DN: low flood risk at worstCM23 1DX: low flood risk at worstCM23 1DY: low flood risk at worstCM23 1JB: low flood risk at worstCM23 1JH: low flood risk at worstCM23 2AH: low flood risk at worstCM23 2AJ: low flood risk at worstCM23 2BP: low flood risk at worstCM23 2BN: low flood risk at worstCM23 2DF: low flood risk at worstCM23 3BX: low flood risk at worstCM23 2EB: low flood risk at worstCM23 2EU: low flood risk at worstCM23 3AL: low flood risk at worstCM23 2XR: low flood risk at worstCM23 2HD: low flood risk at worstCM23 2HU: low flood risk at worstCM23 3SA: low flood risk at worstCM23 3AG: low flood risk at worstCM23 3AR: low flood risk at worstCM23 3BL: low flood risk at worstCM23 3BT: low flood risk at worstCM23 3BY: low flood risk at worstCM23 3FX: low flood risk at worstCM23 3GD: low flood risk at worstCM23 3GN: low flood risk at worstCM23 3JB: low flood risk at worstCM23 3JL: low flood risk at worstCM23 3LL: low flood risk at worstCM23 3NA: low flood risk at worstCM23 3NE: low flood risk at worstCM23 3NS: low flood risk at worstCM23 3US: low flood risk at worstCM23 3YT: low flood risk at worstCM23 4AU: low flood risk at worstCM23 4AX: low flood risk at worstCM23 5AP: low flood risk at worstCM23 5AN: low flood risk at worstCM23 5FA: low flood risk at worstCM23 5GZ: low flood risk at worstCM23 5NZ: low flood risk at worstCM23 5PN: low flood risk at worstCM23 5TT: low flood risk at worstCM23 2HH: medium flood risk at worstCM23 2EL: medium flood risk at worstCM23 2HA: medium flood risk at worstCM23 2SU: medium flood risk at worstCM23 3AB: medium flood risk at worstCM23 3BJ: medium flood risk at worstCM23 3DA: medium flood risk at worstCM23 3JE: medium flood risk at worstCM23 4BA: medium flood risk at worstCM23 5BJ: medium flood risk at worstCM23 1DE: high flood riskCM23 1DQ: high flood riskCM23 3AE: high flood riskCM23 2EJ: high flood riskCM23 2EQ: high flood riskCM23 2EY: high flood riskCM23 2JY: high flood riskCM23 2HR: high flood riskCM23 2HG: high flood riskCM23 5AS: high flood riskCM23 2JW: high flood riskCM23 2SS: high flood riskCM23 3BD: high flood riskCM23 3DH: high flood riskCM23 3DP: high flood riskCM23 3DR: high flood riskCM23 3DS: high flood riskCM23 3DT: high flood riskCM23 3DY: high flood riskCM23 3XQ: high flood riskCM23 3JG: high flood riskCM23 3JJ: high flood riskCM23 3JN: high flood riskCM23 3JQ: high flood riskCM23 3JX: high flood riskCM23 3LJ: high flood riskCM23 3RD: high flood riskCM23 3XG: high flood riskCM23 4AY: high flood riskCM23 5AZ: high flood risk Bishop's StortfordStansted MountfitchetElsenhamBurton End 19 postcodes at high or medium risk, outlined: this goes to CM23 3LE, the one with most homes and businesses at high risk19 postcodes at high or medium risk13 postcodes at high or medium risk, outlined: this goes to CM23 3AS, the one with most homes and businesses at high risk13 postcodes at high or medium risk8 postcodes at high or medium risk, outlined: this goes to CM23 2SS, the one with most homes and businesses at high risk8 postcodes at high or medium risk Map of every postcode in CM23, by flood risk Of the 1,200 postcodes in CM23 that ONS places, 39 have a home or business at high risk, 12 are at medium risk at worst, 64 are at low risk at worst and 1,085 are not on the Environment Agency's at-risk list. 3 groups of postcodes at high or medium risk are outlined: 19 postcodes at high or medium risk; 13 postcodes at high or medium risk; 8 postcodes at high or medium risk. Places named: Bishop's Stortford, Stansted Mountfitchet, Elsenham. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. M11A120 Bishop's StortfordStansted MountfitchetElsenham 13 postcodes at high or medium risk, outlined: this goes to CM23 3AS, the one with most homes and businesses at high risk13 postcodes at high or medium risk8 postcodes at high or medium risk, outlined: this goes to CM23 2SS, the one with most homes and businesses at high risk8 postcodes at high or medium risk
  • A home or business at high risk: 39
  • At medium risk at worst: 12
  • At low risk at worst: 64
  • At very low risk only: 0
  • Not on the at-risk list: 1,085
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 1,200 postcodes in CM23 that ONS places, 39 have a home or business at high risk, 12 are at medium risk at worst, 64 are at low risk at worst and 1,085 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.

The middle of its postcodes: latitude 51.8728, longitude 0.1580. 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

39 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.

CM23 3AS30 at high riskCM23 2EQ25 at high riskCM23 3LE21 at high riskCM23 3DH8 at high riskCM23 3DR6 at high riskCM23 3JH6 at high riskCM23 3JJ6 at high riskCM23 2SS6 at high riskCM23 5AZ6 at high riskCM23 3FR4 at high riskCM23 3JG4 at high riskCM23 1DQ4 at high risk

Where the postcodes at high or medium risk lie together

  • 19 postcodes at high or medium risk, outlined on the map. CM23 3LE, is the one with most homes and businesses at high risk.
  • 13 postcodes at high or medium risk, outlined on the map. CM23 3AS, is the one with most homes and businesses at high risk.
  • 8 postcodes at high or medium risk, outlined on the map. CM23 2SS, is the one with most homes and businesses at high risk.

What broadband can you get in CM23?

Ofcom reports on 1,119 of the 1,200 postcodes in CM23. At 779 of them every home and business can get gigabit broadband, and at 1 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit779 of 1,119
Postcodes where every home can get superfast1,055 of 1,119
Postcodes where some cannot get decent broadband1 of 1,119

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 CM23 at risk of flooding?

115 of the 1,200 postcodes in CM23 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 277 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 115 of 1,200 postcodes High: 174Medium: 103Low: 754Very low: 5

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 CM23?

Homes in CM23 sold for a typical £425,000 in the 12 months to August 2026, across 538 sales, down 4.7% on the 12 months before, HM Land Registry's figures show.

£425,000 typical price, the 12 months to August 2026
12 months to August 2025
£446,000
12 months to August 2026
£425,000

▼ down 4.7% on the 12 months before

Detached£645,750 153 sales
Semi-detached£448,000 158 sales
Terraced£375,000 129 sales
Flat or maisonette£253,750 98 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 CM23

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

CM23 045 postcodesCM23 1137 postcodesCM23 2300 postcodesCM23 3265 postcodesCM23 4231 postcodesCM23 5203 postcodesCM23 919 postcodes
UK postcode format explained

Places in CM23

Towns and villages with postcodes in CM23, and how many each has here.

Bishop's Stortford postcodes,990Stansted Mountfitchet postcodes,1

Who covers CM23

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

  • Hertford and Stortford1,099
  • North West Essex98
  • Harlow2
  • North East Hertfordshire1

Police force areas

  • Hertfordshire1,100
  • Essex100

Next to CM23

CM22 postcode district CM24 postcode district All CM districts Bishop's Stortford postcodes

"Next to" is by number: the districts before and after CM23 in the CM area.

Check a postcode

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