AL2 postcode district: Chiswell Green and around, Hertfordshire

AL2 is a postcode district in Hertfordshire, with 737 postcodes in use in 3 sectors. It has postcodes in Chiswell Green, London Colney, Bricket Wood and 2 more places. It is split between 2 councils: St Albans (726 postcodes) and Hertsmere (11).

Postcodes in use
737
Sectors
3
Councils
2 councils
Places
5 places

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

Every postcode in AL2, by flood risk

Map of every postcode in AL2, by flood risk Of the 737 postcodes in AL2 that ONS places, 23 have a home or business at high risk, 10 are at medium risk at worst, 15 are at low risk at worst and 689 are not on the Environment Agency's at-risk list. 2 groups of postcodes at high or medium risk are outlined: 10 postcodes at high or medium risk; 8 postcodes at high or medium risk. Places named: Chiswell Green, London Colney, Bricket Wood, Shenley, Park Street and Frogmore. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A414A4147M1A405 AL2 1AB: not on the flood risk listAL2 1AE: not on the flood risk listAL2 1AF: not on the flood risk listAL2 1AG: not on the flood risk listAL2 1AJ: not on the flood risk listAL2 1AP: not on the flood risk listAL2 1AT: not on the flood risk listAL2 1AW: not on the flood risk listAL2 1BH: not on the flood risk listAL2 1BL: not on the flood risk listAL2 1BP: not on the flood risk listAL2 1BS: not on the flood risk listAL2 1BT: not on the flood risk listAL2 1BU: not on the flood risk listAL2 1BX: not on the flood risk listAL2 1DA: not on the flood risk listAL2 1DE: not on the flood risk listAL2 1DF: not on the flood risk listAL2 1DH: not on the flood risk listAL2 1DJ: not on the flood risk listAL2 1DN: not on the flood risk listAL2 1DR: not on the flood risk listAL2 1DZ: not on the flood risk listAL2 1EA: not on the flood risk listAL2 1EB: not on the flood risk listAL2 1ED: not on the flood risk listAL2 1EE: not on the flood risk listAL2 1EG: not on the flood risk listAL2 1EH: not on the flood risk listAL2 1EJ: not on the flood risk listAL2 1EN: not on the flood risk listAL2 1EP: not on the flood risk listAL2 1EQ: not on the flood risk listAL2 1ER: not on the flood risk listAL2 1ES: not on the flood risk listAL2 1EU: not on the flood risk listAL2 1EW: not on the flood risk listAL2 1EZ: not on the flood risk listAL2 1FB: not on the flood risk listAL2 1FD: not on the flood risk listAL2 1FE: not on the flood risk listAL2 1FG: not on the flood risk listAL2 1FH: not on the flood risk listAL2 1FN: not on the flood risk listAL2 1FP: not on the flood risk listAL2 1FQ: not on the flood risk listAL2 1FR: not on the flood risk listAL2 1FT: not on the flood risk listAL2 1FU: not on the flood risk listAL2 1GA: not on the flood risk listAL2 1GB: not on the flood risk listAL2 1GD: not on the flood risk listAL2 1GE: not on the flood risk listAL2 1GF: not on the flood risk listAL2 1GG: not on the flood risk listAL2 1GH: not on the flood risk listAL2 1GL: not on the flood risk listAL2 1GN: not on the flood risk listAL2 1GQ: not on the flood risk listAL2 1GR: not on the flood risk listAL2 1GX: not on the flood risk listAL2 1GY: not on the flood risk listAL2 1GZ: not on the flood risk listAL2 1HB: not on the flood risk listAL2 1HD: not on the flood risk listAL2 1HE: not on the flood risk listAL2 1HL: not on the flood risk listAL2 1HN: not on the flood risk listAL2 1HP: not on the flood risk listAL2 1HQ: not on the flood risk listAL2 1HR: not on the flood risk listAL2 1HS: not on the flood risk listAL2 1HT: not on the flood risk listAL2 1HU: not on the flood risk listAL2 1HW: not on the flood risk listAL2 1HX: not on the flood risk listAL2 1HZ: not on the flood risk listAL2 1JA: not on the flood risk listAL2 1JB: not on the flood risk listAL2 1JD: not on the flood risk listAL2 1JE: not on the flood risk listAL2 1JF: not on the flood risk listAL2 1JH: not on the flood risk listAL2 1JJ: not on the flood risk listAL2 1JL: not on the flood risk listAL2 1JN: not on the flood risk listAL2 1JS: not on the flood risk listAL2 1JT: not on the flood risk listAL2 1JU: not on the flood risk listAL2 1JW: not on the flood risk listAL2 1JX: not on the flood risk listAL2 1JZ: not on the flood risk listAL2 1LB: not on the flood risk listAL2 1LD: not on the flood risk listAL2 1LE: not on the flood risk listAL2 1LF: not on the flood risk listAL2 1LL: not on the flood risk listAL2 1LN: not on the flood risk listAL2 1LP: not on the flood risk listAL2 1LS: not on the flood risk listAL2 1LU: not on the flood risk listAL2 1LW: not on the flood risk listAL2 1LX: not on the flood risk listAL2 1LZ: not on the flood risk listAL2 1ND: not on the flood risk listAL2 1NE: not on the flood risk listAL2 1NF: not on the flood risk listAL2 1NG: not on the flood risk listAL2 1NH: not on the flood risk listAL2 1NJ: not on the flood risk listAL2 1NL: not on the flood risk listAL2 1NP: not on the flood risk listAL2 1NQ: not on the flood risk listAL2 1NS: not on the flood risk listAL2 1NT: not on the flood risk listAL2 1NU: not on the flood risk listAL2 1NW: not on the flood risk listAL2 1NX: not on the flood risk listAL2 1NY: not on the flood risk listAL2 1PD: not on the flood risk listAL2 1PF: not on the flood risk listAL2 1PG: not on the flood risk listAL2 1PH: not on the flood risk listAL2 1PJ: not on the flood risk listAL2 1PL: not on the flood risk listAL2 1PP: not on the flood risk listAL2 1PQ: not on the flood risk listAL2 1PR: not on the flood risk listAL2 1PS: not on the flood risk listAL2 1PT: not on the flood risk listAL2 1PU: not on the flood risk listAL2 1PW: not on the flood risk listAL2 1PX: not on the flood risk listAL2 1PY: not on the flood risk listAL2 1PZ: not on the flood risk listAL2 1QD: not on the flood risk listAL2 1QF: not on the flood risk listAL2 1QG: not on the flood risk listAL2 1QH: not on the flood risk listAL2 1QP: not on the flood risk listAL2 1QR: not on the flood risk listAL2 1QT: not on the flood risk listAL2 1RA: not on the flood risk listAL2 1RF: not on the flood risk listAL2 1RG: not on the flood risk listAL2 1RH: not on the flood risk listAL2 1RL: not on the flood risk listAL2 1RY: not on the flood risk listAL2 1TA: not on the flood risk listAL2 1TB: not on the flood risk listAL2 1TD: not on the flood risk listAL2 1TE: not on the flood risk listAL2 1TG: not on the flood risk listAL2 1TH: not on the flood risk listAL2 1TJ: not on the flood risk listAL2 1TL: not on the flood risk listAL2 1TN: not on the flood risk listAL2 1UA: not on the flood risk listAL2 1UB: not on the flood risk listAL2 1UD: not on the flood risk listAL2 1UE: not on the flood risk listAL2 1UF: not on the flood risk listAL2 1UG: not on the flood risk listAL2 1UH: not on the flood risk listAL2 1UJ: not on the flood risk listAL2 1UN: not on the flood risk listAL2 1UP: not on the flood risk listAL2 1UQ: not on the flood risk listAL2 1UR: not on the flood risk listAL2 1US: not on the flood risk listAL2 1UT: not on the flood risk listAL2 1UW: not on the flood risk listAL2 1UX: not on the flood risk listAL2 1WW: not on the flood risk listAL2 2AB: not on the flood risk listAL2 2AD: not on the flood risk listAL2 2AE: not on the flood risk listAL2 2AF: not on the flood risk listAL2 2AG: not on the flood risk listAL2 2AH: not on the flood risk listAL2 2AJ: not on the flood risk listAL2 2AL: not on the flood risk listAL2 2AN: not on the flood risk listAL2 2AP: not on the flood risk listAL2 2AQ: not on the flood risk listAL2 2AR: not on the flood risk listAL2 2AT: not on the flood risk listAL2 2AU: not on the flood risk listAL2 2AX: not on the flood risk listAL2 2AY: not on the flood risk listAL2 2AZ: not on the flood risk listAL2 2BA: not on the flood risk listAL2 2BB: not on the flood risk listAL2 2BD: not on the flood risk listAL2 2BE: not on the flood risk listAL2 2BG: not on the flood risk listAL2 2BH: not on the flood risk listAL2 2BQ: not on the flood risk listAL2 2DB: not on the flood risk listAL2 2DD: not on the flood risk listAL2 2DJ: not on the flood risk listAL2 2DL: not on the flood risk listAL2 2DP: not on the flood risk listAL2 2DQ: not on the flood risk listAL2 2DR: not on the flood risk listAL2 2DS: not on the flood risk listAL2 2DT: not on the flood risk listAL2 2DU: not on the flood risk listAL2 2DW: not on the flood risk listAL2 2DX: not on the flood risk listAL2 2DZ: not on the flood risk listAL2 2EA: not on the flood risk listAL2 2EB: not on the flood risk listAL2 2EE: not on the flood risk listAL2 2EF: not on the flood risk listAL2 2EJ: not on the flood risk listAL2 2EL: not on the flood risk listAL2 2ES: not on the flood risk listAL2 2ET: not on the flood risk listAL2 2EW: not on the flood risk listAL2 2EX: not on the flood risk listAL2 2EZ: not on the flood risk listAL2 2FA: not on the flood risk listAL2 2FB: not on the flood risk listAL2 2FD: not on the flood risk listAL2 2FE: not on the flood risk listAL2 2FF: not on the flood risk listAL2 2FH: not on the flood risk listAL2 2FJ: not on the flood risk listAL2 2FL: not on the flood risk listAL2 2FN: not on the flood risk listAL2 2FP: not on the flood risk listAL2 2FQ: not on the flood risk listAL2 2FR: not on the flood risk listAL2 2FS: not on the flood risk listAL2 2FU: not on the flood risk listAL2 2HD: not on the flood risk listAL2 2HE: not on the flood risk listAL2 2HF: not on the flood risk listAL2 2HG: not on the flood risk listAL2 2HH: not on the flood risk listAL2 2HJ: not on the flood risk listAL2 2HL: not on the flood risk listAL2 2HN: not on the flood risk listAL2 2HP: not on the flood risk listAL2 2HQ: not on the flood risk listAL2 2HR: not on the flood risk listAL2 2HT: not on the flood risk listAL2 2HU: not on the flood risk listAL2 2HW: not on the flood risk listAL2 2HX: not on the flood risk listAL2 2HY: not on the flood risk listAL2 2HZ: not on the flood risk listAL2 2JA: not on the flood risk listAL2 2JB: not on the flood risk listAL2 2JD: not on the flood risk listAL2 2JE: not on the flood risk listAL2 2JF: not on the flood risk listAL2 2JG: not on the flood risk listAL2 2JJ: not on the flood risk listAL2 2JL: not on the flood risk listAL2 2JQ: not on the flood risk listAL2 2JS: not on the flood risk listAL2 2JU: not on the flood risk listAL2 2JX: not on the flood risk listAL2 2JY: not on the flood risk listAL2 2JZ: not on the flood risk listAL2 2LA: not on the flood risk listAL2 2LB: not on the flood risk listAL2 2LD: not on the flood risk listAL2 2LE: not on the flood risk listAL2 2LF: not on the flood risk listAL2 2LH: not on the flood risk listAL2 2LJ: not on the flood risk listAL2 2LL: not on the flood risk listAL2 2LR: not on the flood risk listAL2 2LS: not on the flood risk listAL2 2LU: not on the flood risk listAL2 2LX: not on the flood risk listAL2 2LZ: not on the flood risk listAL2 2NA: not on the flood risk listAL2 2NB: not on the flood risk listAL2 2NE: not on the flood risk listAL2 2NF: not on the flood risk listAL2 2NG: not on the flood risk listAL2 2NL: not on the flood risk listAL2 2NN: not on the flood risk listAL2 2NP: not on the flood risk listAL2 2NR: not on the flood risk listAL2 2NT: not on the flood risk listAL2 2NU: not on the flood risk listAL2 2NW: not on the flood risk listAL2 2NX: not on the flood risk listAL2 2NY: not on the flood risk listAL2 2NZ: not on the flood risk listAL2 2PA: not on the flood risk listAL2 2PB: not on the flood risk listAL2 2PD: not on the flood risk listAL2 2PE: not on the flood risk listAL2 2PH: not on the flood risk listAL2 2PJ: not on the flood risk listAL2 2PP: not on the flood risk listAL2 2PQ: not on the flood risk listAL2 2PR: not on the flood risk listAL2 2PT: not on the flood risk listAL2 2PW: not on the flood risk listAL2 2PZ: not on the flood risk listAL2 2QB: not on the flood risk listAL2 2QE: not on the flood risk listAL2 2QG: not on the flood risk listAL2 2QH: not on the flood risk listAL2 2QJ: not on the flood risk listAL2 2QL: not on the flood risk listAL2 2QN: not on the flood risk listAL2 2QP: not on the flood risk listAL2 2QQ: not on the flood risk listAL2 2QR: not on the flood risk listAL2 2QS: not on the flood risk listAL2 2QT: not on the flood risk listAL2 2QU: not on the flood risk listAL2 2QW: not on the flood risk listAL2 2QX: not on the flood risk listAL2 2QY: not on the flood risk listAL2 2RA: not on the flood risk listAL2 2RB: not on the flood risk listAL2 2RD: not on the flood risk listAL2 2RE: not on the flood risk listAL2 2RF: not on the flood risk listAL2 2RH: not on the flood risk listAL2 2RP: not on the flood risk listAL2 2RQ: not on the flood risk listAL2 2RR: not on the flood risk listAL2 2RS: not on the flood risk listAL2 2RT: not on the flood risk listAL2 2RW: not on the flood risk listAL2 2RX: not on the flood risk listAL2 2RY: not on the flood risk listAL2 2RZ: not on the flood risk listAL2 2SA: not on the flood risk listAL2 2SB: not on the flood risk listAL2 2SD: not on the flood risk listAL2 2SE: not on the flood risk listAL2 2SF: not on the flood risk listAL2 2SG: not on the flood risk listAL2 2SH: not on the flood risk listAL2 2SJ: not on the flood risk listAL2 2SQ: not on the flood risk listAL2 2TB: not on the flood risk listAL2 2TS: not on the flood risk listAL2 2TT: not on the flood risk listAL2 2TU: not on the flood risk listAL2 2TY: not on the flood risk listAL2 3AA: not on the flood risk listAL2 3AB: not on the flood risk listAL2 3AD: not on the flood risk listAL2 3AF: not on the flood risk listAL2 3AG: not on the flood risk listAL2 3AH: not on the flood risk listAL2 3AJ: not on the flood risk listAL2 3AL: not on the flood risk listAL2 3AN: not on the flood risk listAL2 3AP: not on the flood risk listAL2 3AQ: not on the flood risk listAL2 3AR: not on the flood risk listAL2 3AT: not on the flood risk listAL2 3AW: not on the flood risk listAL2 3AX: not on the flood risk listAL2 3AY: not on the flood risk listAL2 3AZ: not on the flood risk listAL2 3BA: not on the flood risk listAL2 3BB: not on the flood risk listAL2 3BE: not on the flood risk listAL2 3BG: not on the flood risk listAL2 3BH: not on the flood risk listAL2 3BN: not on the flood risk listAL2 3BQ: not on the flood risk listAL2 3BX: not on the flood risk listAL2 3BY: not on the flood risk listAL2 3DA: not on the flood risk listAL2 3DB: not on the flood risk listAL2 3DD: not on the flood risk listAL2 3DE: not on the flood risk listAL2 3DF: not on the flood risk listAL2 3DG: not on the flood risk listAL2 3DH: not on the flood risk listAL2 3DJ: not on the flood risk listAL2 3DL: not on the flood risk listAL2 3DN: not on the flood risk listAL2 3DP: not on the flood risk listAL2 3DQ: not on the flood risk listAL2 3DR: not on the flood risk listAL2 3DS: not on the flood risk listAL2 3DT: not on the flood risk listAL2 3DW: not on the flood risk listAL2 3DX: not on the flood risk listAL2 3DY: not on the flood risk listAL2 3DZ: not on the flood risk listAL2 3EA: not on the flood risk listAL2 3ED: not on the flood risk listAL2 3EH: not on the flood risk listAL2 3EJ: not on the flood risk listAL2 3EL: not on the flood risk listAL2 3EN: not on the flood risk listAL2 3EQ: not on the flood risk listAL2 3ET: not on the flood risk listAL2 3EZ: not on the flood risk listAL2 3FB: not on the flood risk listAL2 3FD: not on the flood risk listAL2 3FF: not on the flood risk listAL2 3FG: not on the flood risk listAL2 3FH: not on the flood risk listAL2 3FJ: not on the flood risk listAL2 3FL: not on the flood risk listAL2 3FP: not on the flood risk listAL2 3FQ: not on the flood risk listAL2 3FR: not on the flood risk listAL2 3FU: not on the flood risk listAL2 3FW: not on the flood risk listAL2 3FX: not on the flood risk listAL2 3FZ: not on the flood risk listAL2 3HA: not on the flood risk listAL2 3HB: not on the flood risk listAL2 3HD: not on the flood risk listAL2 3HE: not on the flood risk listAL2 3HG: not on the flood risk listAL2 3HH: not on the flood risk listAL2 3HJ: not on the flood risk listAL2 3HL: not on the flood risk listAL2 3HN: not on the flood risk listAL2 3HP: not on the flood risk listAL2 3HQ: not on the flood risk listAL2 3HR: not on the flood risk listAL2 3HS: not on the flood risk listAL2 3HT: not on the flood risk listAL2 3HU: not on the flood risk listAL2 3HW: not on the flood risk listAL2 3HX: not on the flood risk listAL2 3HY: not on the flood risk listAL2 3HZ: not on the flood risk listAL2 3JE: not on the flood risk listAL2 3JX: not on the flood risk listAL2 3JY: not on the flood risk listAL2 3JZ: not on the flood risk listAL2 3LA: not on the flood risk listAL2 3LB: not on the flood risk listAL2 3LD: not on the flood risk listAL2 3LE: not on the flood risk listAL2 3LF: not on the flood risk listAL2 3LG: not on the flood risk listAL2 3LH: not on the flood risk listAL2 3LJ: not on the flood risk listAL2 3LL: not on the flood risk listAL2 3LN: not on the flood risk listAL2 3LP: not on the flood risk listAL2 3LQ: not on the flood risk listAL2 3LR: not on the flood risk listAL2 3LS: not on the flood risk listAL2 3LU: not on the flood risk listAL2 3LW: not on the flood risk listAL2 3LX: not on the flood risk listAL2 3NA: not on the flood risk listAL2 3NB: not on the flood risk listAL2 3ND: not on the flood risk listAL2 3NE: not on the flood risk listAL2 3NF: not on the flood risk listAL2 3NG: not on the flood risk listAL2 3NH: not on the flood risk listAL2 3NJ: not on the flood risk listAL2 3NL: not on the flood risk listAL2 3NN: not on the flood risk listAL2 3NP: not on the flood risk listAL2 3NQ: not on the flood risk listAL2 3NS: not on the flood risk listAL2 3NT: not on the flood risk listAL2 3NU: not on the flood risk listAL2 3NW: not on the flood risk listAL2 3NX: not on the flood risk listAL2 3NY: not on the flood risk listAL2 3PB: not on the flood risk listAL2 3PD: not on the flood risk listAL2 3PE: not on the flood risk listAL2 3PG: not on the flood risk listAL2 3PH: not on the flood risk listAL2 3PJ: not on the flood risk listAL2 3PL: not on the flood risk listAL2 3PP: not on the flood risk listAL2 3PQ: not on the flood risk listAL2 3PS: not on the flood risk listAL2 3PT: not on the flood risk listAL2 3PW: not on the flood risk listAL2 3PX: not on the flood risk listAL2 3PY: not on the flood risk listAL2 3QA: not on the flood risk listAL2 3QB: not on the flood risk listAL2 3QD: not on the flood risk listAL2 3QE: not on the flood risk listAL2 3QF: not on the flood risk listAL2 3QH: not on the flood risk listAL2 3QJ: not on the flood risk listAL2 3QL: not on the flood risk listAL2 3QN: not on the flood risk listAL2 3QP: not on the flood risk listAL2 3QQ: not on the flood risk listAL2 3QR: not on the flood risk listAL2 3QS: not on the flood risk listAL2 3QT: not on the flood risk listAL2 3QX: not on the flood risk listAL2 3QY: not on the flood risk listAL2 3RH: not on the flood risk listAL2 3RP: not on the flood risk listAL2 3RR: not on the flood risk listAL2 3RS: not on the flood risk listAL2 3RT: not on the flood risk listAL2 3RU: not on the flood risk listAL2 3RW: not on the flood risk listAL2 3RX: not on the flood risk listAL2 3RY: not on the flood risk listAL2 3RZ: not on the flood risk listAL2 3SB: not on the flood risk listAL2 3SD: not on the flood risk listAL2 3SE: not on the flood risk listAL2 3SF: not on the flood risk listAL2 3SG: not on the flood risk listAL2 3SH: not on the flood risk listAL2 3SJ: not on the flood risk listAL2 3SL: not on the flood risk listAL2 3SN: not on the flood risk listAL2 3SP: not on the flood risk listAL2 3SQ: not on the flood risk listAL2 3SS: not on the flood risk listAL2 3ST: not on the flood risk listAL2 3SU: not on the flood risk listAL2 3SW: not on the flood risk listAL2 3SY: not on the flood risk listAL2 3SZ: not on the flood risk listAL2 3TA: not on the flood risk listAL2 3TB: not on the flood risk listAL2 3TD: not on the flood risk listAL2 3TE: not on the flood risk listAL2 3TF: not on the flood risk listAL2 3TJ: not on the flood risk listAL2 3TL: not on the flood risk listAL2 3TN: not on the flood risk listAL2 3TP: not on the flood risk listAL2 3TQ: not on the flood risk listAL2 3TT: not on the flood risk listAL2 3TW: not on the flood risk listAL2 3TZ: not on the flood risk listAL2 3UA: not on the flood risk listAL2 3UB: not on the flood risk listAL2 3UD: not on the flood risk listAL2 3UF: not on the flood risk listAL2 3UH: not on the flood risk listAL2 3UL: not on the flood risk listAL2 3UN: not on the flood risk listAL2 3UP: not on the flood risk listAL2 3UR: not on the flood risk listAL2 3US: not on the flood risk listAL2 3UT: not on the flood risk listAL2 3UU: not on the flood risk listAL2 3UW: not on the flood risk listAL2 3UX: not on the flood risk listAL2 3UY: not on the flood risk listAL2 3XA: not on the flood risk listAL2 3XB: not on the flood risk listAL2 3XD: not on the flood risk listAL2 3XF: not on the flood risk listAL2 3XG: not on the flood risk listAL2 3XH: not on the flood risk listAL2 3XJ: not on the flood risk listAL2 3XL: not on the flood risk listAL2 3XN: not on the flood risk listAL2 3XP: not on the flood risk listAL2 3XQ: not on the flood risk listAL2 3XR: not on the flood risk listAL2 3XS: not on the flood risk listAL2 3XT: not on the flood risk listAL2 3XU: not on the flood risk listAL2 3XX: not on the flood risk listAL2 3XY: not on the flood risk listAL2 3XZ: not on the flood risk listAL2 3YA: not on the flood risk listAL2 3YB: not on the flood risk listAL2 3YT: not on the flood risk listAL2 1BG: low flood risk at worstAL2 1BE: low flood risk at worstAL2 1BJ: low flood risk at worstAL2 1BZ: low flood risk at worstAL2 1DT: low flood risk at worstAL2 1DW: low flood risk at worstAL2 1HG: low flood risk at worstAL2 1LG: low flood risk at worstAL2 1RD: low flood risk at worstAL2 1RW: low flood risk at worstAL2 2JR: low flood risk at worstAL2 2LN: low flood risk at worstAL2 3PN: low flood risk at worstAL2 1AH: medium flood risk at worstAL2 1AZ: medium flood risk at worstAL2 1DY: medium flood risk at worstAL2 1DG: medium flood risk at worstAL2 1QA: medium flood risk at worstAL2 1SA: medium flood risk at worstAL2 2EN: medium flood risk at worstAL2 2LW: medium flood risk at worstAL2 3TX: medium flood risk at worstAL2 1AD: high flood riskAL2 1BA: high flood riskAL2 1BB: high flood riskAL2 1BY: high flood riskAL2 1DP: high flood riskAL2 1DQ: high flood riskAL2 1LJ: high flood riskAL2 1NZ: high flood riskAL2 1PA: high flood riskAL2 1PB: high flood riskAL2 1PE: high flood riskAL2 1RE: high flood riskAL2 1QX: high flood riskAL2 1QY: high flood riskAL2 1RB: high flood riskAL2 1RN: high flood riskAL2 1RR: high flood riskAL2 1RT: high flood riskAL2 1RU: high flood riskAL2 1RX: high flood riskAL2 1RZ: high flood riskAL2 2DY: high flood risk Chiswell GreenLondon ColneyBricket WoodShenleyPark Street and Frogmore 10 postcodes at high or medium risk, outlined: this goes to AL2 1PE, the one with most homes and businesses at high risk10 postcodes at high or medium risk Map of every postcode in AL2, by flood risk Of the 737 postcodes in AL2 that ONS places, 23 have a home or business at high risk, 10 are at medium risk at worst, 15 are at low risk at worst and 689 are not on the Environment Agency's at-risk list. 2 groups of postcodes at high or medium risk are outlined: 10 postcodes at high or medium risk; 8 postcodes at high or medium risk. Places named: Chiswell Green, London Colney, Bricket Wood, Shenley. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A4147A1081 Chiswell GreenLondon ColneyBricket WoodShenley
  • A home or business at high risk: 23
  • At medium risk at worst: 10
  • At low risk at worst: 15
  • At very low risk only: 0
  • Not on the at-risk list: 689
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 737 postcodes in AL2 that ONS places, 23 have a home or business at high risk, 10 are at medium risk at worst, 15 are at low risk at worst and 689 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 51.7190, longitude -0.3358. 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

23 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.

AL2 1PE35 at high riskAL2 1RR19 at high riskAL2 1PA14 at high riskAL2 1RU11 at high riskAL2 1LJ9 at high riskAL2 1RX8 at high riskAL2 1PB7 at high riskAL2 1RN6 at high riskAL2 1RT6 at high riskAL2 1RB6 at high riskAL2 1BB5 at high riskAL2 1QX4 at high risk

Where the postcodes at high or medium risk lie together

  • 10 postcodes at high or medium risk, outlined on the map. AL2 1PE, is the one with most homes and businesses at high risk.
  • 8 postcodes at high or medium risk, outlined on the map. AL2 1RB, is the one with most homes and businesses at high risk.

What broadband can you get in AL2?

Ofcom reports on 721 of the 737 postcodes in AL2. At 602 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit602 of 721
Postcodes where every home can get superfast682 of 721

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 AL2 at risk of flooding?

48 of the 737 postcodes in AL2 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 216 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 48 of 737 postcodes High: 152Medium: 64Low: 137

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 AL2?

Homes in AL2 sold for a typical £530,000 in the 12 months to August 2026, across 263 sales, down 3.6% 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
£550,000
12 months to August 2026
£530,000

▼ down 3.6% on the 12 months before

Detached£750,000 68 sales
Semi-detached£585,000 66 sales
Terraced£465,000 70 sales
Flat or maisonette£280,000 59 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 AL2

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

AL2 1248 postcodesAL2 2217 postcodesAL2 3272 postcodes
UK postcode format explained

Places in AL2

Towns and villages with postcodes in AL2, and how many each has here.

Chiswell Green postcodes,216London Colney postcodes,206Bricket Wood postcodes,140Park Street and Frogmore postcodes,75St Albans postcodes,8

Who covers AL2

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

  • St Albans720
  • Hertsmere11
  • Harpenden and Berkhamsted6

Police force areas

  • Hertfordshire737

Next to AL2

AL1 postcode district AL3 postcode district All AL districts Chiswell Green postcodes

"Next to" is by number: the districts before and after AL2 in the AL area.

Check a postcode

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