SL9 postcode district: Chalfont St Peter and around

SL9 is a postcode district in England, with 872 postcodes in use in 5 sectors. It has postcodes in Chalfont St Peter and Gerrards Cross. It is split between 2 councils: Buckinghamshire (869 postcodes) and Three Rivers (3). 3 of its 872 postcodes are in Hertfordshire. ONS lists no county for the other 869.

Postcodes in use
872
Sectors
5
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 SL9, by flood risk

Map of every postcode in SL9, by flood risk Of the 872 postcodes in SL9 that ONS places, 1 have a home or business at high risk, 4 are at medium risk at worst, 23 are at low risk at worst and 844 are not on the Environment Agency's at-risk list. Places named: Chalfont St Peter, Gerrards Cross, Seer Green, Maple Cross. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. M25M40 SL9 0AA: not on the flood risk listSL9 0AB: not on the flood risk listSL9 0AD: not on the flood risk listSL9 0AE: not on the flood risk listSL9 0AF: not on the flood risk listSL9 0AH: not on the flood risk listSL9 0AJ: not on the flood risk listSL9 0AL: not on the flood risk listSL9 0AP: not on the flood risk listSL9 0AQ: not on the flood risk listSL9 0AR: not on the flood risk listSL9 0AS: not on the flood risk listSL9 0AT: not on the flood risk listSL9 0AU: not on the flood risk listSL9 0AW: not on the flood risk listSL9 0AX: not on the flood risk listSL9 0AY: not on the flood risk listSL9 0AZ: not on the flood risk listSL9 0BA: not on the flood risk listSL9 0BB: not on the flood risk listSL9 0BD: not on the flood risk listSL9 0BG: not on the flood risk listSL9 0BJ: not on the flood risk listSL9 0BL: not on the flood risk listSL9 0BN: not on the flood risk listSL9 0BP: not on the flood risk listSL9 0BT: not on the flood risk listSL9 0BW: not on the flood risk listSL9 0BX: not on the flood risk listSL9 0BY: not on the flood risk listSL9 0BZ: not on the flood risk listSL9 0DA: not on the flood risk listSL9 0DB: not on the flood risk listSL9 0DD: not on the flood risk listSL9 0DE: not on the flood risk listSL9 0DF: not on the flood risk listSL9 0DG: not on the flood risk listSL9 0DH: not on the flood risk listSL9 0DJ: not on the flood risk listSL9 0DL: not on the flood risk listSL9 0DP: not on the flood risk listSL9 0DQ: not on the flood risk listSL9 0DR: not on the flood risk listSL9 0DS: not on the flood risk listSL9 0DW: not on the flood risk listSL9 0DX: not on the flood risk listSL9 0DY: not on the flood risk listSL9 0DZ: not on the flood risk listSL9 0EA: not on the flood risk listSL9 0EB: not on the flood risk listSL9 0ED: not on the flood risk listSL9 0EF: not on the flood risk listSL9 0EG: not on the flood risk listSL9 0EH: not on the flood risk listSL9 0EJ: not on the flood risk listSL9 0EN: not on the flood risk listSL9 0EP: not on the flood risk listSL9 0EQ: not on the flood risk listSL9 0ER: not on the flood risk listSL9 0ES: not on the flood risk listSL9 0ET: not on the flood risk listSL9 0EU: not on the flood risk listSL9 0EW: not on the flood risk listSL9 0EX: not on the flood risk listSL9 0EY: not on the flood risk listSL9 0EZ: not on the flood risk listSL9 0FA: not on the flood risk listSL9 0FB: not on the flood risk listSL9 0FD: not on the flood risk listSL9 0FF: not on the flood risk listSL9 0FH: not on the flood risk listSL9 0FJ: not on the flood risk listSL9 0FL: not on the flood risk listSL9 0FN: not on the flood risk listSL9 0FP: not on the flood risk listSL9 0FQ: not on the flood risk listSL9 0FS: not on the flood risk listSL9 0FU: not on the flood risk listSL9 0FW: not on the flood risk listSL9 0FX: not on the flood risk listSL9 0GA: not on the flood risk listSL9 0HA: not on the flood risk listSL9 0HB: not on the flood risk listSL9 0HD: not on the flood risk listSL9 0HE: not on the flood risk listSL9 0HF: not on the flood risk listSL9 0HG: not on the flood risk listSL9 0HH: not on the flood risk listSL9 0HJ: not on the flood risk listSL9 0HL: not on the flood risk listSL9 0HN: not on the flood risk listSL9 0HQ: not on the flood risk listSL9 0HR: not on the flood risk listSL9 0HS: not on the flood risk listSL9 0HT: not on the flood risk listSL9 0HU: not on the flood risk listSL9 0HW: not on the flood risk listSL9 0HX: not on the flood risk listSL9 0HY: not on the flood risk listSL9 0HZ: not on the flood risk listSL9 0JA: not on the flood risk listSL9 0JD: not on the flood risk listSL9 0JE: not on the flood risk listSL9 0JF: not on the flood risk listSL9 0JG: not on the flood risk listSL9 0JH: not on the flood risk listSL9 0JJ: not on the flood risk listSL9 0JL: not on the flood risk listSL9 0JQ: not on the flood risk listSL9 0JR: not on the flood risk listSL9 0JT: not on the flood risk listSL9 0JU: not on the flood risk listSL9 0JX: not on the flood risk listSL9 0JY: not on the flood risk listSL9 0JZ: not on the flood risk listSL9 0LA: not on the flood risk listSL9 0LB: not on the flood risk listSL9 0LD: not on the flood risk listSL9 0LE: not on the flood risk listSL9 0LF: not on the flood risk listSL9 0LG: not on the flood risk listSL9 0LH: not on the flood risk listSL9 0LJ: not on the flood risk listSL9 0LP: not on the flood risk listSL9 0LQ: not on the flood risk listSL9 0LR: not on the flood risk listSL9 0LS: not on the flood risk listSL9 0LT: not on the flood risk listSL9 0LU: not on the flood risk listSL9 0LW: not on the flood risk listSL9 0LX: not on the flood risk listSL9 0LY: not on the flood risk listSL9 0LZ: not on the flood risk listSL9 0NA: not on the flood risk listSL9 0NB: not on the flood risk listSL9 0NE: not on the flood risk listSL9 0NF: not on the flood risk listSL9 0NH: not on the flood risk listSL9 0NJ: not on the flood risk listSL9 0NL: not on the flood risk listSL9 0NN: not on the flood risk listSL9 0NP: not on the flood risk listSL9 0NQ: not on the flood risk listSL9 0NS: not on the flood risk listSL9 0NU: not on the flood risk listSL9 0NW: not on the flood risk listSL9 0NX: not on the flood risk listSL9 0NY: not on the flood risk listSL9 0NZ: not on the flood risk listSL9 0PB: not on the flood risk listSL9 0PD: not on the flood risk listSL9 0PF: not on the flood risk listSL9 0PG: not on the flood risk listSL9 0PH: not on the flood risk listSL9 0PJ: not on the flood risk listSL9 0PL: not on the flood risk listSL9 0PN: not on the flood risk listSL9 0PP: not on the flood risk listSL9 0PQ: not on the flood risk listSL9 0PT: not on the flood risk listSL9 0PW: not on the flood risk listSL9 0PY: not on the flood risk listSL9 0PZ: not on the flood risk listSL9 0QD: not on the flood risk listSL9 0QE: not on the flood risk listSL9 0QF: not on the flood risk listSL9 0QG: not on the flood risk listSL9 0QH: not on the flood risk listSL9 0QJ: not on the flood risk listSL9 0QP: not on the flood risk listSL9 0QQ: not on the flood risk listSL9 0QR: not on the flood risk listSL9 0QT: not on the flood risk listSL9 0QU: not on the flood risk listSL9 0QW: not on the flood risk listSL9 0QX: not on the flood risk listSL9 0QY: not on the flood risk listSL9 0QZ: not on the flood risk listSL9 0RB: not on the flood risk listSL9 0RD: not on the flood risk listSL9 0RE: not on the flood risk listSL9 0RG: not on the flood risk listSL9 0RH: not on the flood risk listSL9 0RJ: not on the flood risk listSL9 0RL: not on the flood risk listSL9 0RN: not on the flood risk listSL9 0RP: not on the flood risk listSL9 0RQ: not on the flood risk listSL9 0RX: not on the flood risk listSL9 0SA: not on the flood risk listSL9 0SD: not on the flood risk listSL9 0SE: not on the flood risk listSL9 0SX: not on the flood risk listSL9 1AT: not on the flood risk listSL9 7AA: not on the flood risk listSL9 7AB: not on the flood risk listSL9 7AD: not on the flood risk listSL9 7AF: not on the flood risk listSL9 7AH: not on the flood risk listSL9 7AL: not on the flood risk listSL9 7AN: not on the flood risk listSL9 7AP: not on the flood risk listSL9 7AQ: not on the flood risk listSL9 7AS: not on the flood risk listSL9 7AT: not on the flood risk listSL9 7AU: not on the flood risk listSL9 7AW: not on the flood risk listSL9 7AX: not on the flood risk listSL9 7BB: not on the flood risk listSL9 7BD: not on the flood risk listSL9 7BE: not on the flood risk listSL9 7BG: not on the flood risk listSL9 7BJ: not on the flood risk listSL9 7BL: not on the flood risk listSL9 7BN: not on the flood risk listSL9 7BP: not on the flood risk listSL9 7BU: not on the flood risk listSL9 7BW: not on the flood risk listSL9 7BZ: not on the flood risk listSL9 7DE: not on the flood risk listSL9 7DJ: not on the flood risk listSL9 7DL: not on the flood risk listSL9 7DP: not on the flood risk listSL9 7DS: not on the flood risk listSL9 7DT: not on the flood risk listSL9 7DU: not on the flood risk listSL9 7DW: not on the flood risk listSL9 7DX: not on the flood risk listSL9 7DZ: not on the flood risk listSL9 7EB: not on the flood risk listSL9 7ED: not on the flood risk listSL9 7EE: not on the flood risk listSL9 7EF: not on the flood risk listSL9 7EG: not on the flood risk listSL9 7EH: not on the flood risk listSL9 7EJ: not on the flood risk listSL9 7EL: not on the flood risk listSL9 7EN: not on the flood risk listSL9 7EP: not on the flood risk listSL9 7EQ: not on the flood risk listSL9 7ER: not on the flood risk listSL9 7EW: not on the flood risk listSL9 7EY: not on the flood risk listSL9 7EZ: not on the flood risk listSL9 7FB: not on the flood risk listSL9 7FD: not on the flood risk listSL9 7FE: not on the flood risk listSL9 7FF: not on the flood risk listSL9 7FH: not on the flood risk listSL9 7FJ: not on the flood risk listSL9 7FL: not on the flood risk listSL9 7HA: not on the flood risk listSL9 7HB: not on the flood risk listSL9 7HD: not on the flood risk listSL9 7HE: not on the flood risk listSL9 7HF: not on the flood risk listSL9 7HG: not on the flood risk listSL9 7HH: not on the flood risk listSL9 7HJ: not on the flood risk listSL9 7HL: not on the flood risk listSL9 7HN: not on the flood risk listSL9 7HP: not on the flood risk listSL9 7HR: not on the flood risk listSL9 7HS: not on the flood risk listSL9 7HU: not on the flood risk listSL9 7HW: not on the flood risk listSL9 7HX: not on the flood risk listSL9 7HY: not on the flood risk listSL9 7HZ: not on the flood risk listSL9 7JA: not on the flood risk listSL9 7JB: not on the flood risk listSL9 7JD: not on the flood risk listSL9 7JE: not on the flood risk listSL9 7JF: not on the flood risk listSL9 7JG: not on the flood risk listSL9 7JH: not on the flood risk listSL9 7JQ: not on the flood risk listSL9 7JS: not on the flood risk listSL9 7JT: not on the flood risk listSL9 7JU: not on the flood risk listSL9 7JX: not on the flood risk listSL9 7JZ: not on the flood risk listSL9 7LA: not on the flood risk listSL9 7LB: not on the flood risk listSL9 7LD: not on the flood risk listSL9 7LE: not on the flood risk listSL9 7LF: not on the flood risk listSL9 7LG: not on the flood risk listSL9 7LH: not on the flood risk listSL9 7LJ: not on the flood risk listSL9 7LL: not on the flood risk listSL9 7LN: not on the flood risk listSL9 7LP: not on the flood risk listSL9 7LQ: not on the flood risk listSL9 7LR: not on the flood risk listSL9 7LS: not on the flood risk listSL9 7LT: not on the flood risk listSL9 7LU: not on the flood risk listSL9 7LW: not on the flood risk listSL9 7LX: not on the flood risk listSL9 7LZ: not on the flood risk listSL9 7NA: not on the flood risk listSL9 7NB: not on the flood risk listSL9 7ND: not on the flood risk listSL9 7NE: not on the flood risk listSL9 7NF: not on the flood risk listSL9 7NG: not on the flood risk listSL9 7NH: not on the flood risk listSL9 7NJ: not on the flood risk listSL9 7NL: not on the flood risk listSL9 7NN: not on the flood risk listSL9 7NP: not on the flood risk listSL9 7NR: not on the flood risk listSL9 7NS: not on the flood risk listSL9 7NT: not on the flood risk listSL9 7NU: not on the flood risk listSL9 7NW: not on the flood risk listSL9 7NX: not on the flood risk listSL9 7NZ: not on the flood risk listSL9 7PA: not on the flood risk listSL9 7PB: not on the flood risk listSL9 7PD: not on the flood risk listSL9 7PE: not on the flood risk listSL9 7PF: not on the flood risk listSL9 7PG: not on the flood risk listSL9 7PL: not on the flood risk listSL9 7PN: not on the flood risk listSL9 7PP: not on the flood risk listSL9 7PR: not on the flood risk listSL9 7PS: not on the flood risk listSL9 7PU: not on the flood risk listSL9 7PW: not on the flood risk listSL9 7PX: not on the flood risk listSL9 7PY: not on the flood risk listSL9 7PZ: not on the flood risk listSL9 7QA: not on the flood risk listSL9 7QN: not on the flood risk listSL9 7QQ: not on the flood risk listSL9 7QR: not on the flood risk listSL9 7QS: not on the flood risk listSL9 7QT: not on the flood risk listSL9 7QU: not on the flood risk listSL9 7QW: not on the flood risk listSL9 7QY: not on the flood risk listSL9 7QZ: not on the flood risk listSL9 7RA: not on the flood risk listSL9 7RB: not on the flood risk listSL9 7RD: not on the flood risk listSL9 7RE: not on the flood risk listSL9 7RF: not on the flood risk listSL9 7RH: not on the flood risk listSL9 7RJ: not on the flood risk listSL9 7RN: not on the flood risk listSL9 7RR: not on the flood risk listSL9 7RS: not on the flood risk listSL9 7RT: not on the flood risk listSL9 8AA: not on the flood risk listSL9 8AB: not on the flood risk listSL9 8AD: not on the flood risk listSL9 8AE: not on the flood risk listSL9 8AF: not on the flood risk listSL9 8AG: not on the flood risk listSL9 8AH: not on the flood risk listSL9 8AJ: not on the flood risk listSL9 8AL: not on the flood risk listSL9 8AN: not on the flood risk listSL9 8AP: not on the flood risk listSL9 8AQ: not on the flood risk listSL9 8AR: not on the flood risk listSL9 8AS: not on the flood risk listSL9 8AT: not on the flood risk listSL9 8AU: not on the flood risk listSL9 8AW: not on the flood risk listSL9 8AX: not on the flood risk listSL9 8AY: not on the flood risk listSL9 8AZ: not on the flood risk listSL9 8BA: not on the flood risk listSL9 8BB: not on the flood risk listSL9 8BD: not on the flood risk listSL9 8BE: not on the flood risk listSL9 8BH: not on the flood risk listSL9 8BJ: not on the flood risk listSL9 8BL: not on the flood risk listSL9 8BQ: not on the flood risk listSL9 8BR: not on the flood risk listSL9 8BS: not on the flood risk listSL9 8BW: not on the flood risk listSL9 8BY: not on the flood risk listSL9 8BZ: not on the flood risk listSL9 8DA: not on the flood risk listSL9 8DB: not on the flood risk listSL9 8DD: not on the flood risk listSL9 8DE: not on the flood risk listSL9 8DF: not on the flood risk listSL9 8DG: not on the flood risk listSL9 8DH: not on the flood risk listSL9 8DJ: not on the flood risk listSL9 8DL: not on the flood risk listSL9 8DN: not on the flood risk listSL9 8DP: not on the flood risk listSL9 8DQ: not on the flood risk listSL9 8DR: not on the flood risk listSL9 8DS: not on the flood risk listSL9 8DT: not on the flood risk listSL9 8DW: not on the flood risk listSL9 8DX: not on the flood risk listSL9 8EB: not on the flood risk listSL9 8EF: not on the flood risk listSL9 8EL: not on the flood risk listSL9 8EN: not on the flood risk listSL9 8ER: not on the flood risk listSL9 8ES: not on the flood risk listSL9 8EU: not on the flood risk listSL9 8EY: not on the flood risk listSL9 8EZ: not on the flood risk listSL9 8FE: not on the flood risk listSL9 8FF: not on the flood risk listSL9 8FG: not on the flood risk listSL9 8FN: not on the flood risk listSL9 8FW: not on the flood risk listSL9 8GZ: not on the flood risk listSL9 8HA: not on the flood risk listSL9 8HB: not on the flood risk listSL9 8HD: not on the flood risk listSL9 8HE: not on the flood risk listSL9 8HJ: not on the flood risk listSL9 8HL: not on the flood risk listSL9 8HN: not on the flood risk listSL9 8HQ: not on the flood risk listSL9 8HT: not on the flood risk listSL9 8HU: not on the flood risk listSL9 8HW: not on the flood risk listSL9 8HX: not on the flood risk listSL9 8HY: not on the flood risk listSL9 8HZ: not on the flood risk listSL9 8JA: not on the flood risk listSL9 8JB: not on the flood risk listSL9 8JD: not on the flood risk listSL9 8JE: not on the flood risk listSL9 8JF: not on the flood risk listSL9 8JG: not on the flood risk listSL9 8JH: not on the flood risk listSL9 8JJ: not on the flood risk listSL9 8JL: not on the flood risk listSL9 8JN: not on the flood risk listSL9 8JP: not on the flood risk listSL9 8JQ: not on the flood risk listSL9 8JS: not on the flood risk listSL9 8JT: not on the flood risk listSL9 8JU: not on the flood risk listSL9 8JW: not on the flood risk listSL9 8JX: not on the flood risk listSL9 8JY: not on the flood risk listSL9 8JZ: not on the flood risk listSL9 8LA: not on the flood risk listSL9 8LB: not on the flood risk listSL9 8LD: not on the flood risk listSL9 8LE: not on the flood risk listSL9 8LG: not on the flood risk listSL9 8LH: not on the flood risk listSL9 8LJ: not on the flood risk listSL9 8LL: not on the flood risk listSL9 8LN: not on the flood risk listSL9 8LP: not on the flood risk listSL9 8LQ: not on the flood risk listSL9 8LR: not on the flood risk listSL9 8LS: not on the flood risk listSL9 8LT: not on the flood risk listSL9 8LU: not on the flood risk listSL9 8LW: not on the flood risk listSL9 8LX: not on the flood risk listSL9 8LZ: not on the flood risk listSL9 8NA: not on the flood risk listSL9 8NB: not on the flood risk listSL9 8ND: not on the flood risk listSL9 8NF: not on the flood risk listSL9 8NG: not on the flood risk listSL9 8NH: not on the flood risk listSL9 8NJ: not on the flood risk listSL9 8NL: not on the flood risk listSL9 8NN: not on the flood risk listSL9 8NP: not on the flood risk listSL9 8NR: not on the flood risk listSL9 8NS: not on the flood risk listSL9 8NT: not on the flood risk listSL9 8NU: not on the flood risk listSL9 8NW: not on the flood risk listSL9 8NX: not on the flood risk listSL9 8NY: not on the flood risk listSL9 8NZ: not on the flood risk listSL9 8PD: not on the flood risk listSL9 8PG: not on the flood risk listSL9 8PJ: not on the flood risk listSL9 8PL: not on the flood risk listSL9 8PR: not on the flood risk listSL9 8PS: not on the flood risk listSL9 8PT: not on the flood risk listSL9 8PU: not on the flood risk listSL9 8PW: not on the flood risk listSL9 8PX: not on the flood risk listSL9 8PY: not on the flood risk listSL9 8PZ: not on the flood risk listSL9 8QB: not on the flood risk listSL9 8QD: not on the flood risk listSL9 8QE: not on the flood risk listSL9 8QF: not on the flood risk listSL9 8QG: not on the flood risk listSL9 8QH: not on the flood risk listSL9 8QJ: not on the flood risk listSL9 8QL: not on the flood risk listSL9 8QN: not on the flood risk listSL9 8QQ: not on the flood risk listSL9 8QT: not on the flood risk listSL9 8RA: not on the flood risk listSL9 8RD: not on the flood risk listSL9 8RE: not on the flood risk listSL9 8RF: not on the flood risk listSL9 8RG: not on the flood risk listSL9 8RH: not on the flood risk listSL9 8RJ: not on the flood risk listSL9 8RL: not on the flood risk listSL9 8RN: not on the flood risk listSL9 8RP: not on the flood risk listSL9 8RQ: not on the flood risk listSL9 8RR: not on the flood risk listSL9 8RS: not on the flood risk listSL9 8RT: not on the flood risk listSL9 8RU: not on the flood risk listSL9 8RW: not on the flood risk listSL9 8RX: not on the flood risk listSL9 8RY: not on the flood risk listSL9 8RZ: not on the flood risk listSL9 8SA: not on the flood risk listSL9 8SB: not on the flood risk listSL9 8SD: not on the flood risk listSL9 8SE: not on the flood risk listSL9 8SF: not on the flood risk listSL9 8SG: not on the flood risk listSL9 8SJ: not on the flood risk listSL9 8SP: not on the flood risk listSL9 8SQ: not on the flood risk listSL9 8SR: not on the flood risk listSL9 8SS: not on the flood risk listSL9 8ST: not on the flood risk listSL9 8SU: not on the flood risk listSL9 8SW: not on the flood risk listSL9 8SX: not on the flood risk listSL9 8SY: not on the flood risk listSL9 8SZ: not on the flood risk listSL9 8TA: not on the flood risk listSL9 8TB: not on the flood risk listSL9 8TD: not on the flood risk listSL9 8TE: not on the flood risk listSL9 8TH: not on the flood risk listSL9 8TJ: not on the flood risk listSL9 8TL: not on the flood risk listSL9 8TN: not on the flood risk listSL9 8TP: not on the flood risk listSL9 8TQ: not on the flood risk listSL9 8TR: not on the flood risk listSL9 8TS: not on the flood risk listSL9 8TT: not on the flood risk listSL9 8TU: not on the flood risk listSL9 8UD: not on the flood risk listSL9 9AA: not on the flood risk listSL9 9AB: not on the flood risk listSL9 9AD: not on the flood risk listSL9 9AE: not on the flood risk listSL9 9AF: not on the flood risk listSL9 9AG: not on the flood risk listSL9 9AH: not on the flood risk listSL9 9AJ: not on the flood risk listSL9 9AQ: not on the flood risk listSL9 9AT: not on the flood risk listSL9 9AU: not on the flood risk listSL9 9AX: not on the flood risk listSL9 9AY: not on the flood risk listSL9 9AZ: not on the flood risk listSL9 9BA: not on the flood risk listSL9 9BB: not on the flood risk listSL9 9BD: not on the flood risk listSL9 9BE: not on the flood risk listSL9 9BG: not on the flood risk listSL9 9BH: not on the flood risk listSL9 9BJ: not on the flood risk listSL9 9BL: not on the flood risk listSL9 9BQ: not on the flood risk listSL9 9BW: not on the flood risk listSL9 9DA: not on the flood risk listSL9 9DB: not on the flood risk listSL9 9DD: not on the flood risk listSL9 9DE: not on the flood risk listSL9 9DG: not on the flood risk listSL9 9DH: not on the flood risk listSL9 9DJ: not on the flood risk listSL9 9DL: not on the flood risk listSL9 9DN: not on the flood risk listSL9 9DP: not on the flood risk listSL9 9DQ: not on the flood risk listSL9 9DR: not on the flood risk listSL9 9DS: not on the flood risk listSL9 9DT: not on the flood risk listSL9 9DU: not on the flood risk listSL9 9DW: not on the flood risk listSL9 9EA: not on the flood risk listSL9 9EB: not on the flood risk listSL9 9ET: not on the flood risk listSL9 9EU: not on the flood risk listSL9 9EX: not on the flood risk listSL9 9EY: not on the flood risk listSL9 9FD: not on the flood risk listSL9 9FE: not on the flood risk listSL9 9FH: not on the flood risk listSL9 9FJ: not on the flood risk listSL9 9FL: not on the flood risk listSL9 9FN: not on the flood risk listSL9 9FP: not on the flood risk listSL9 9FR: not on the flood risk listSL9 9FT: not on the flood risk listSL9 9FU: not on the flood risk listSL9 9FW: not on the flood risk listSL9 9FX: not on the flood risk listSL9 9HB: not on the flood risk listSL9 9HG: not on the flood risk listSL9 9HH: not on the flood risk listSL9 9HJ: not on the flood risk listSL9 9HL: not on the flood risk listSL9 9HN: not on the flood risk listSL9 9HP: not on the flood risk listSL9 9HQ: not on the flood risk listSL9 9HR: not on the flood risk listSL9 9HS: not on the flood risk listSL9 9HT: not on the flood risk listSL9 9HU: not on the flood risk listSL9 9HX: not on the flood risk listSL9 9HY: not on the flood risk listSL9 9HZ: not on the flood risk listSL9 9JB: not on the flood risk listSL9 9JD: not on the flood risk listSL9 9JE: not on the flood risk listSL9 9JF: not on the flood risk listSL9 9JG: not on the flood risk listSL9 9JH: not on the flood risk listSL9 9JJ: not on the flood risk listSL9 9JR: not on the flood risk listSL9 9JU: not on the flood risk listSL9 9JY: not on the flood risk listSL9 9LB: not on the flood risk listSL9 9LD: not on the flood risk listSL9 9LE: not on the flood risk listSL9 9LF: not on the flood risk listSL9 9LG: not on the flood risk listSL9 9LH: not on the flood risk listSL9 9LL: not on the flood risk listSL9 9LN: not on the flood risk listSL9 9LR: not on the flood risk listSL9 9LS: not on the flood risk listSL9 9LT: not on the flood risk listSL9 9LU: not on the flood risk listSL9 9LW: not on the flood risk listSL9 9LX: not on the flood risk listSL9 9LZ: not on the flood risk listSL9 9NA: not on the flood risk listSL9 9NB: not on the flood risk listSL9 9NE: not on the flood risk listSL9 9NF: not on the flood risk listSL9 9NJ: not on the flood risk listSL9 9NL: not on the flood risk listSL9 9NN: not on the flood risk listSL9 9NP: not on the flood risk listSL9 9NR: not on the flood risk listSL9 9NS: not on the flood risk listSL9 9NT: not on the flood risk listSL9 9NU: not on the flood risk listSL9 9NW: not on the flood risk listSL9 9NX: not on the flood risk listSL9 9NZ: not on the flood risk listSL9 9PA: not on the flood risk listSL9 9PB: not on the flood risk listSL9 9PD: not on the flood risk listSL9 9PE: not on the flood risk listSL9 9PF: not on the flood risk listSL9 9PG: not on the flood risk listSL9 9PH: not on the flood risk listSL9 9PJ: not on the flood risk listSL9 9PL: not on the flood risk listSL9 9PP: not on the flood risk listSL9 9PQ: not on the flood risk listSL9 9PR: not on the flood risk listSL9 9QP: not on the flood risk listSL9 9QR: not on the flood risk listSL9 9QT: not on the flood risk listSL9 9QU: not on the flood risk listSL9 9RF: not on the flood risk listSL9 9RL: not on the flood risk listSL9 9RN: not on the flood risk listSL9 9RP: not on the flood risk listSL9 9RU: not on the flood risk listSL9 9RY: not on the flood risk listSL9 9RZ: not on the flood risk listSL9 9SA: not on the flood risk listSL9 9SB: not on the flood risk listSL9 9SD: not on the flood risk listSL9 9SE: not on the flood risk listSL9 9SF: not on the flood risk listSL9 9SG: not on the flood risk listSL9 9SH: not on the flood risk listSL9 9SJ: not on the flood risk listSL9 9SL: not on the flood risk listSL9 9SN: not on the flood risk listSL9 9SP: not on the flood risk listSL9 9SR: not on the flood risk listSL9 9SS: not on the flood risk listSL9 9SW: not on the flood risk listSL9 9SY: not on the flood risk listSL9 9TB: not on the flood risk listSL9 9TD: not on the flood risk listSL9 9TF: not on the flood risk listSL9 9TG: not on the flood risk listSL9 9TH: not on the flood risk listSL9 9TJ: not on the flood risk listSL9 9TL: not on the flood risk listSL9 9TR: not on the flood risk listSL9 9TS: not on the flood risk listSL9 9TT: not on the flood risk listSL9 9TU: not on the flood risk listSL9 9TX: not on the flood risk listSL9 9TY: not on the flood risk listSL9 9TZ: not on the flood risk listSL9 9UA: not on the flood risk listSL9 9UB: not on the flood risk listSL9 9UD: not on the flood risk listSL9 9UP: not on the flood risk listSL9 0PA: low flood risk at worstSL9 0PU: low flood risk at worstSL9 0PX: low flood risk at worstSL9 0QA: low flood risk at worstSL9 9AL: low flood risk at worstSL9 9AP: low flood risk at worstSL9 9AR: low flood risk at worstSL9 9AS: low flood risk at worstSL9 9RA: low flood risk at worstSL9 9EQ: low flood risk at worstSL9 9FG: low flood risk at worstSL9 9JT: low flood risk at worstSL9 9QA: low flood risk at worstSL9 9QH: low flood risk at worstSL9 9QL: low flood risk at worstSL9 9QQ: low flood risk at worstSL9 9RJ: low flood risk at worstSL9 9RS: low flood risk at worstSL9 9TA: low flood risk at worstSL9 9TW: low flood risk at worstSL9 9UE: low flood risk at worstSL9 9YZ: low flood risk at worstSL9 9AW: medium flood risk at worstSL9 9QE: medium flood risk at worstSL9 9TP: medium flood risk at worstSL9 9UL: medium flood risk at worstSL9 9QX: high flood risk Chalfont St PeterGerrards CrossSeer GreenMaple Cross Map of every postcode in SL9, by flood risk Of the 872 postcodes in SL9 that ONS places, 1 have a home or business at high risk, 4 are at medium risk at worst, 23 are at low risk at worst and 844 are not on the Environment Agency's at-risk list. Places named: Chalfont St Peter, Gerrards Cross. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. Chalfont St PeterGerrards Cross
  • A home or business at high risk: 1
  • At medium risk at worst: 4
  • At low risk at worst: 23
  • At very low risk only: 0
  • Not on the at-risk list: 844

Of the 872 postcodes in SL9 that ONS places, 1 have a home or business at high risk, 4 are at medium risk at worst, 23 are at low risk at worst and 844 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. 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 51.5981, longitude -0.5557. Open this area on OpenStreetMap

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; flood risk: Environment Agency, published 6 July 2026; roads, rivers and built-up areas: Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre. How we use them

The postcodes at high risk

Beside each: how many of its homes and businesses the Environment Agency puts at that risk.

SL9 9QX3 at high risk

What broadband can you get in SL9?

Ofcom reports on 843 of the 872 postcodes in SL9. At 688 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit688 of 843
Postcodes where every home can get superfast795 of 843

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 SL9 at risk of flooding?

28 of the 872 postcodes in SL9 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 23 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 28 of 872 postcodes High: 3Medium: 20Low: 262

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 SL9?

Homes in SL9 sold for a typical £834,650 in the 12 months to August 2026, across 222 sales, down 2.9% on the 12 months before, HM Land Registry's figures show.

£834,650 typical price, the 12 months to August 2026
£860,000 12 months to August 2025
▼ down 2.9% on the 12 months before
  • Detached £994,500 118 sales
  • Semi-detached £737,500 30 sales
  • Terraced £585,000 27 sales
  • Flat or maisonette £430,000 47 sales

Each bar is that kind's typical price, against the most expensive kind here.

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

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

Postcodes in SL9

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

SL9 0215 postcodesSL9 116 postcodesSL9 7179 postcodesSL9 8235 postcodesSL9 9227 postcodes
UK postcode format explained

Places in SL9

Towns and villages with postcodes in SL9, and how many each has here.

Chalfont St Peter postcodes,520Gerrards Cross postcodes,295

Who covers SL9

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

  • Chesham and Amersham843
  • Beaconsfield26
  • South West Hertfordshire3

Police force areas

  • Thames Valley869
  • Hertfordshire3

Next to SL9

SL8 postcode district SL60 postcode district All SL districts Chalfont St Peter postcodes

"Next to" is by number: the districts before and after SL9 in the SL area.

Check a postcode

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