SO23 postcode district: Winchester and around, Hampshire

SO23 is a postcode district in Hampshire, with 812 postcodes in use in 6 sectors. It has postcodes in Winchester and Kings Worthy. Its council is Winchester.

Postcodes in use
812
Sectors
6
Council
Winchester
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 SO23, by flood risk

Map of every postcode in SO23, by flood risk Of the 812 postcodes in SO23 that ONS places, 20 have a home or business at high risk, 5 are at medium risk at worst, 27 are at low risk at worst, 5 are at very low risk only and 755 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 13 postcodes at high or medium risk. One postcode lies beyond the edge and is listed under the map. Places named: Winchester, Kings Worthy. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A33A3090 SO23 0AA: not on the flood risk listSO23 0AD: not on the flood risk listSO23 0AE: not on the flood risk listSO23 0AF: not on the flood risk listSO23 0AG: not on the flood risk listSO23 0AH: not on the flood risk listSO23 0AL: not on the flood risk listSO23 0AN: not on the flood risk listSO23 0AP: not on the flood risk listSO23 0AQ: not on the flood risk listSO23 0AR: not on the flood risk listSO23 0AS: not on the flood risk listSO23 0BB: not on the flood risk listSO23 0DA: not on the flood risk listSO23 0EL: not on the flood risk listSO23 0EN: not on the flood risk listSO23 0EP: not on the flood risk listSO23 0EQ: not on the flood risk listSO23 0ET: not on the flood risk listSO23 0EU: not on the flood risk listSO23 0EX: not on the flood risk listSO23 0EY: not on the flood risk listSO23 0HA: not on the flood risk listSO23 0HB: not on the flood risk listSO23 0HD: not on the flood risk listSO23 0HE: not on the flood risk listSO23 0HF: not on the flood risk listSO23 0HG: not on the flood risk listSO23 0HH: not on the flood risk listSO23 0HJ: not on the flood risk listSO23 0HN: not on the flood risk listSO23 0HQ: not on the flood risk listSO23 0HR: not on the flood risk listSO23 0HU: not on the flood risk listSO23 0HX: not on the flood risk listSO23 0HZ: not on the flood risk listSO23 0JD: not on the flood risk listSO23 0JF: not on the flood risk listSO23 0JG: not on the flood risk listSO23 0JH: not on the flood risk listSO23 0JJ: not on the flood risk listSO23 0JL: not on the flood risk listSO23 0JN: not on the flood risk listSO23 0JP: not on the flood risk listSO23 0JQ: not on the flood risk listSO23 0JR: not on the flood risk listSO23 0JS: not on the flood risk listSO23 0JT: not on the flood risk listSO23 0JU: not on the flood risk listSO23 0JW: not on the flood risk listSO23 0JX: not on the flood risk listSO23 0JY: not on the flood risk listSO23 0JZ: not on the flood risk listSO23 0LA: not on the flood risk listSO23 0LD: not on the flood risk listSO23 0LE: not on the flood risk listSO23 0LF: not on the flood risk listSO23 0LG: not on the flood risk listSO23 0LN: not on the flood risk listSO23 0LR: not on the flood risk listSO23 0LU: not on the flood risk listSO23 0LX: not on the flood risk listSO23 0LY: not on the flood risk listSO23 0LZ: not on the flood risk listSO23 0NA: not on the flood risk listSO23 0NF: not on the flood risk listSO23 0NG: not on the flood risk listSO23 0NH: not on the flood risk listSO23 0NJ: not on the flood risk listSO23 0NL: not on the flood risk listSO23 0NN: not on the flood risk listSO23 0NP: not on the flood risk listSO23 0NQ: not on the flood risk listSO23 0NR: not on the flood risk listSO23 0NS: not on the flood risk listSO23 0NT: not on the flood risk listSO23 0NU: not on the flood risk listSO23 0NW: not on the flood risk listSO23 0NX: not on the flood risk listSO23 0NZ: not on the flood risk listSO23 0PA: not on the flood risk listSO23 0PB: not on the flood risk listSO23 0PD: not on the flood risk listSO23 0PE: not on the flood risk listSO23 0PF: not on the flood risk listSO23 0PG: not on the flood risk listSO23 0PJ: not on the flood risk listSO23 0PP: not on the flood risk listSO23 0PT: not on the flood risk listSO23 0PU: not on the flood risk listSO23 0PW: not on the flood risk listSO23 0PX: not on the flood risk listSO23 0PY: not on the flood risk listSO23 0PZ: not on the flood risk listSO23 0QA: not on the flood risk listSO23 0QB: not on the flood risk listSO23 0QD: not on the flood risk listSO23 0QE: not on the flood risk listSO23 0QF: not on the flood risk listSO23 0QG: not on the flood risk listSO23 0QH: not on the flood risk listSO23 0QJ: not on the flood risk listSO23 0QL: not on the flood risk listSO23 0QN: not on the flood risk listSO23 0QP: not on the flood risk listSO23 0QQ: not on the flood risk listSO23 0QR: not on the flood risk listSO23 0QS: not on the flood risk listSO23 0QT: not on the flood risk listSO23 0QU: not on the flood risk listSO23 0QW: not on the flood risk listSO23 0QX: not on the flood risk listSO23 0RH: not on the flood risk listSO23 3SA: not on the flood risk listSO23 7AA: not on the flood risk listSO23 7AB: not on the flood risk listSO23 7AD: not on the flood risk listSO23 7AE: not on the flood risk listSO23 7AF: not on the flood risk listSO23 7AG: not on the flood risk listSO23 7AH: not on the flood risk listSO23 7AJ: not on the flood risk listSO23 7AN: not on the flood risk listSO23 7AP: not on the flood risk listSO23 7AQ: not on the flood risk listSO23 7AT: not on the flood risk listSO23 7AY: not on the flood risk listSO23 7AZ: not on the flood risk listSO23 7BA: not on the flood risk listSO23 7BB: not on the flood risk listSO23 7BD: not on the flood risk listSO23 7BE: not on the flood risk listSO23 7BH: not on the flood risk listSO23 7BJ: not on the flood risk listSO23 7BL: not on the flood risk listSO23 7BQ: not on the flood risk listSO23 7BS: not on the flood risk listSO23 7BT: not on the flood risk listSO23 7BW: not on the flood risk listSO23 7DA: not on the flood risk listSO23 7DE: not on the flood risk listSO23 7DF: not on the flood risk listSO23 7DH: not on the flood risk listSO23 7DJ: not on the flood risk listSO23 7DN: not on the flood risk listSO23 7DP: not on the flood risk listSO23 7DQ: not on the flood risk listSO23 7DR: not on the flood risk listSO23 7DS: not on the flood risk listSO23 7DT: not on the flood risk listSO23 7DU: not on the flood risk listSO23 7DX: not on the flood risk listSO23 7EA: not on the flood risk listSO23 7EB: not on the flood risk listSO23 7ED: not on the flood risk listSO23 7EE: not on the flood risk listSO23 7EF: not on the flood risk listSO23 7EG: not on the flood risk listSO23 7EJ: not on the flood risk listSO23 7EL: not on the flood risk listSO23 7EQ: not on the flood risk listSO23 7ER: not on the flood risk listSO23 7ES: not on the flood risk listSO23 7ET: not on the flood risk listSO23 7EU: not on the flood risk listSO23 7EX: not on the flood risk listSO23 7EY: not on the flood risk listSO23 7FA: not on the flood risk listSO23 7FB: not on the flood risk listSO23 7FD: not on the flood risk listSO23 7FE: not on the flood risk listSO23 7FF: not on the flood risk listSO23 7FG: not on the flood risk listSO23 7FL: not on the flood risk listSO23 7FN: not on the flood risk listSO23 7FP: not on the flood risk listSO23 7FQ: not on the flood risk listSO23 7FR: not on the flood risk listSO23 7FS: not on the flood risk listSO23 7FT: not on the flood risk listSO23 7FU: not on the flood risk listSO23 7FW: not on the flood risk listSO23 7FX: not on the flood risk listSO23 7FY: not on the flood risk listSO23 7FZ: not on the flood risk listSO23 7GA: not on the flood risk listSO23 7GB: not on the flood risk listSO23 7GD: not on the flood risk listSO23 7GL: not on the flood risk listSO23 7GN: not on the flood risk listSO23 7GP: not on the flood risk listSO23 7GQ: not on the flood risk listSO23 7GR: not on the flood risk listSO23 7GS: not on the flood risk listSO23 7GT: not on the flood risk listSO23 7GU: not on the flood risk listSO23 7GW: not on the flood risk listSO23 7GX: not on the flood risk listSO23 7GY: not on the flood risk listSO23 7GZ: not on the flood risk listSO23 7HB: not on the flood risk listSO23 7HD: not on the flood risk listSO23 7HE: not on the flood risk listSO23 7HF: not on the flood risk listSO23 7HG: not on the flood risk listSO23 7HH: not on the flood risk listSO23 7HL: not on the flood risk listSO23 7HN: not on the flood risk listSO23 7HP: not on the flood risk listSO23 7HQ: not on the flood risk listSO23 7HR: not on the flood risk listSO23 7HS: not on the flood risk listSO23 7HT: not on the flood risk listSO23 7HU: not on the flood risk listSO23 7HX: not on the flood risk listSO23 7HY: not on the flood risk listSO23 7HZ: not on the flood risk listSO23 7JA: not on the flood risk listSO23 7JB: not on the flood risk listSO23 7JE: not on the flood risk listSO23 7JF: not on the flood risk listSO23 7JG: not on the flood risk listSO23 7JH: not on the flood risk listSO23 7JJ: not on the flood risk listSO23 7JN: not on the flood risk listSO23 7JP: not on the flood risk listSO23 7JQ: not on the flood risk listSO23 7JR: not on the flood risk listSO23 7JS: not on the flood risk listSO23 7JT: not on the flood risk listSO23 7JU: not on the flood risk listSO23 7JX: not on the flood risk listSO23 7JY: not on the flood risk listSO23 7JZ: not on the flood risk listSO23 7LB: not on the flood risk listSO23 7LH: not on the flood risk listSO23 7LL: not on the flood risk listSO23 7LN: not on the flood risk listSO23 7LP: not on the flood risk listSO23 7LR: not on the flood risk listSO23 7LT: not on the flood risk listSO23 7LU: not on the flood risk listSO23 7LX: not on the flood risk listSO23 7LY: not on the flood risk listSO23 7LZ: not on the flood risk listSO23 7NA: not on the flood risk listSO23 7NB: not on the flood risk listSO23 7ND: not on the flood risk listSO23 7NE: not on the flood risk listSO23 7NF: not on the flood risk listSO23 7NG: not on the flood risk listSO23 7NH: not on the flood risk listSO23 7NJ: not on the flood risk listSO23 7NL: not on the flood risk listSO23 7NN: not on the flood risk listSO23 7NP: not on the flood risk listSO23 7NQ: not on the flood risk listSO23 7NR: not on the flood risk listSO23 7NS: not on the flood risk listSO23 7NT: not on the flood risk listSO23 7NU: not on the flood risk listSO23 7NW: not on the flood risk listSO23 7NX: not on the flood risk listSO23 7NY: not on the flood risk listSO23 7NZ: not on the flood risk listSO23 7PA: not on the flood risk listSO23 7PB: not on the flood risk listSO23 7PD: not on the flood risk listSO23 7PE: not on the flood risk listSO23 7PF: not on the flood risk listSO23 7PG: not on the flood risk listSO23 7PJ: not on the flood risk listSO23 7PL: not on the flood risk listSO23 7PN: not on the flood risk listSO23 7PP: not on the flood risk listSO23 7PQ: not on the flood risk listSO23 7PR: not on the flood risk listSO23 7PS: not on the flood risk listSO23 7PT: not on the flood risk listSO23 7PU: not on the flood risk listSO23 7PW: not on the flood risk listSO23 7PX: not on the flood risk listSO23 7PY: not on the flood risk listSO23 7PZ: not on the flood risk listSO23 7QA: not on the flood risk listSO23 7QB: not on the flood risk listSO23 7QD: not on the flood risk listSO23 7QE: not on the flood risk listSO23 7QF: not on the flood risk listSO23 7QG: not on the flood risk listSO23 7QH: not on the flood risk listSO23 7QJ: not on the flood risk listSO23 7QL: not on the flood risk listSO23 7QN: not on the flood risk listSO23 7QP: not on the flood risk listSO23 7QQ: not on the flood risk listSO23 7QR: not on the flood risk listSO23 7QS: not on the flood risk listSO23 7QT: not on the flood risk listSO23 7QU: not on the flood risk listSO23 7QX: not on the flood risk listSO23 7QY: not on the flood risk listSO23 7QZ: not on the flood risk listSO23 7RA: not on the flood risk listSO23 7RB: not on the flood risk listSO23 7RE: not on the flood risk listSO23 7RF: not on the flood risk listSO23 7RJ: not on the flood risk listSO23 7RL: not on the flood risk listSO23 7RP: not on the flood risk listSO23 7RQ: not on the flood risk listSO23 7RR: not on the flood risk listSO23 7RS: not on the flood risk listSO23 7RT: not on the flood risk listSO23 7RU: not on the flood risk listSO23 7RX: not on the flood risk listSO23 7RY: not on the flood risk listSO23 7RZ: not on the flood risk listSO23 7SA: not on the flood risk listSO23 7SL: not on the flood risk listSO23 7SQ: not on the flood risk listSO23 7SR: not on the flood risk listSO23 7SS: not on the flood risk listSO23 7SZ: not on the flood risk listSO23 7TA: not on the flood risk listSO23 7TD: not on the flood risk listSO23 7TF: not on the flood risk listSO23 7TG: not on the flood risk listSO23 7TJ: not on the flood risk listSO23 7TL: not on the flood risk listSO23 7TN: not on the flood risk listSO23 7TP: not on the flood risk listSO23 7TR: not on the flood risk listSO23 7TS: not on the flood risk listSO23 7TT: not on the flood risk listSO23 7TW: not on the flood risk listSO23 7TX: not on the flood risk listSO23 7TY: not on the flood risk listSO23 7UD: not on the flood risk listSO23 7XA: not on the flood risk listSO23 7XD: not on the flood risk listSO23 7XJ: not on the flood risk listSO23 7XL: not on the flood risk listSO23 7XN: not on the flood risk listSO23 7XR: not on the flood risk listSO23 7XS: not on the flood risk listSO23 7XT: not on the flood risk listSO23 8AA: not on the flood risk listSO23 8AH: not on the flood risk listSO23 8AJ: not on the flood risk listSO23 8AL: not on the flood risk listSO23 8AR: not on the flood risk listSO23 8AT: not on the flood risk listSO23 8AU: not on the flood risk listSO23 8AX: not on the flood risk listSO23 8AZ: not on the flood risk listSO23 8BB: not on the flood risk listSO23 8BE: not on the flood risk listSO23 8BG: not on the flood risk listSO23 8BH: not on the flood risk listSO23 8BL: not on the flood risk listSO23 8BP: not on the flood risk listSO23 8BW: not on the flood risk listSO23 8DA: not on the flood risk listSO23 8DF: not on the flood risk listSO23 8DT: not on the flood risk listSO23 8DY: not on the flood risk listSO23 8EA: not on the flood risk listSO23 8EJ: not on the flood risk listSO23 8FA: not on the flood risk listSO23 8FE: not on the flood risk listSO23 8FF: not on the flood risk listSO23 8FJ: not on the flood risk listSO23 8GB: not on the flood risk listSO23 8GE: not on the flood risk listSO23 8GF: not on the flood risk listSO23 8GG: not on the flood risk listSO23 8GH: not on the flood risk listSO23 8GJ: not on the flood risk listSO23 8GL: not on the flood risk listSO23 8GQ: not on the flood risk listSO23 8HS: not on the flood risk listSO23 8RA: not on the flood risk listSO23 8RB: not on the flood risk listSO23 8RD: not on the flood risk listSO23 8RG: not on the flood risk listSO23 8RJ: not on the flood risk listSO23 8RR: not on the flood risk listSO23 8RS: not on the flood risk listSO23 8RZ: not on the flood risk listSO23 8SA: not on the flood risk listSO23 8SB: not on the flood risk listSO23 8SE: not on the flood risk listSO23 8SH: not on the flood risk listSO23 8SJ: not on the flood risk listSO23 8SN: not on the flood risk listSO23 8SU: not on the flood risk listSO23 8SW: not on the flood risk listSO23 8SY: not on the flood risk listSO23 8SZ: not on the flood risk listSO23 8TA: not on the flood risk listSO23 8TE: not on the flood risk listSO23 8TG: not on the flood risk listSO23 8TH: not on the flood risk listSO23 8TJ: not on the flood risk listSO23 8TQ: not on the flood risk listSO23 8UH: not on the flood risk listSO23 8UL: not on the flood risk listSO23 8UY: not on the flood risk listSO23 9AA: not on the flood risk listSO23 9AD: not on the flood risk listSO23 9AF: not on the flood risk listSO23 9AH: not on the flood risk listSO23 9BL: not on the flood risk listSO23 9BN: not on the flood risk listSO23 9BT: not on the flood risk listSO23 9BU: not on the flood risk listSO23 9BW: not on the flood risk listSO23 9BX: not on the flood risk listSO23 9DA: not on the flood risk listSO23 9DH: not on the flood risk listSO23 9DW: not on the flood risk listSO23 9EB: not on the flood risk listSO23 9ED: not on the flood risk listSO23 9EH: not on the flood risk listSO23 9EN: not on the flood risk listSO23 9EQ: not on the flood risk listSO23 9ES: not on the flood risk listSO23 9EX: not on the flood risk listSO23 9GN: not on the flood risk listSO23 9HE: not on the flood risk listSO23 9HF: not on the flood risk listSO23 9HL: not on the flood risk listSO23 9HP: not on the flood risk listSO23 9HQ: not on the flood risk listSO23 9HT: not on the flood risk listSO23 9HU: not on the flood risk listSO23 9JA: not on the flood risk listSO23 9JB: not on the flood risk listSO23 9JE: not on the flood risk listSO23 9JF: not on the flood risk listSO23 9JG: not on the flood risk listSO23 9JJ: not on the flood risk listSO23 9JL: not on the flood risk listSO23 9JP: not on the flood risk listSO23 9JS: not on the flood risk listSO23 9JW: not on the flood risk listSO23 9LP: not on the flood risk listSO23 9LQ: not on the flood risk listSO23 9LS: not on the flood risk listSO23 9LX: not on the flood risk listSO23 9LY: not on the flood risk listSO23 9LZ: not on the flood risk listSO23 9NB: not on the flood risk listSO23 9ND: not on the flood risk listSO23 9NE: not on the flood risk listSO23 9NF: not on the flood risk listSO23 9NL: not on the flood risk listSO23 9NN: not on the flood risk listSO23 9NP: not on the flood risk listSO23 9NQ: not on the flood risk listSO23 9NR: not on the flood risk listSO23 9NS: not on the flood risk listSO23 9NT: not on the flood risk listSO23 9NU: not on the flood risk listSO23 9PA: not on the flood risk listSO23 9PD: not on the flood risk listSO23 9PF: not on the flood risk listSO23 9PG: not on the flood risk listSO23 9PH: not on the flood risk listSO23 9PL: not on the flood risk listSO23 9PP: not on the flood risk listSO23 9PQ: not on the flood risk listSO23 9PR: not on the flood risk listSO23 9PS: not on the flood risk listSO23 9PU: not on the flood risk listSO23 9PX: not on the flood risk listSO23 9PZ: not on the flood risk listSO23 9QA: not on the flood risk listSO23 9QB: not on the flood risk listSO23 9QE: not on the flood risk listSO23 9QF: not on the flood risk listSO23 9QH: not on the flood risk listSO23 9QP: not on the flood risk listSO23 9QR: not on the flood risk listSO23 9QU: not on the flood risk listSO23 9QX: not on the flood risk listSO23 9QY: not on the flood risk listSO23 9QZ: not on the flood risk listSO23 9RA: not on the flood risk listSO23 9RB: not on the flood risk listSO23 9RD: not on the flood risk listSO23 9RE: not on the flood risk listSO23 9RF: not on the flood risk listSO23 9RG: not on the flood risk listSO23 9RH: not on the flood risk listSO23 9RJ: not on the flood risk listSO23 9RQ: not on the flood risk listSO23 9RS: not on the flood risk listSO23 9RT: not on the flood risk listSO23 9RX: not on the flood risk listSO23 9RZ: not on the flood risk listSO23 9SA: not on the flood risk listSO23 9SB: not on the flood risk listSO23 9SD: not on the flood risk listSO23 9SE: not on the flood risk listSO23 9SF: not on the flood risk listSO23 9SG: not on the flood risk listSO23 9SH: not on the flood risk listSO23 9SL: not on the flood risk listSO23 9SN: not on the flood risk listSO23 9SP: not on the flood risk listSO23 9SQ: not on the flood risk listSO23 9SR: not on the flood risk listSO23 9SS: not on the flood risk listSO23 9ST: not on the flood risk listSO23 9SU: not on the flood risk listSO23 9SY: not on the flood risk listSO23 9TA: not on the flood risk listSO23 9TD: not on the flood risk listSO23 9TE: not on the flood risk listSO23 9TG: not on the flood risk listSO23 9TJ: not on the flood risk listSO23 9TL: not on the flood risk listSO23 9TN: not on the flood risk listSO23 9TP: not on the flood risk listSO23 9TR: not on the flood risk listSO23 9TS: not on the flood risk listSO23 9TT: not on the flood risk listSO23 9TU: not on the flood risk listSO23 9TW: not on the flood risk listSO23 9TY: not on the flood risk listSO23 9WW: not on the flood risk listSO23 7TB: very low flood risk onlySO23 8DG: very low flood risk onlySO23 8DB: very low flood risk onlySO23 8DD: very low flood risk onlySO23 8HW: very low flood risk onlySO23 0EJ: low flood risk at worstSO23 0ES: low flood risk at worstSO23 0EW: low flood risk at worstSO23 7JD: low flood risk at worstSO23 7JL: low flood risk at worstSO23 7LQ: low flood risk at worstSO23 9AX: low flood risk at worstSO23 8BQ: low flood risk at worstSO23 8DQ: low flood risk at worstSO23 8DP: low flood risk at worstSO23 8DR: low flood risk at worstSO23 8DS: low flood risk at worstSO23 8ED: low flood risk at worstSO23 8EG: low flood risk at worstSO23 8QX: low flood risk at worstSO23 8QY: low flood risk at worstSO23 9BE: low flood risk at worstSO23 9GH: low flood risk at worstSO23 9LL: low flood risk at worstSO23 9LR: low flood risk at worstSO23 9LT: low flood risk at worstSO23 9NA: low flood risk at worstSO23 9NX: low flood risk at worstSO23 9QG: low flood risk at worstSO23 7DD: medium flood risk at worstSO23 8AE: medium flood risk at worstSO23 8DJ: medium flood risk at worstSO23 9BH: medium flood risk at worstSO23 7LA: high flood riskSO23 7LD: high flood riskSO23 7LE: high flood riskSO23 7LF: high flood riskSO23 7LG: high flood riskSO23 7LJ: high flood riskSO23 8DL: high flood riskSO23 8DX: high flood riskSO23 8DZ: high flood riskSO23 9BD: high flood riskSO23 9AL: high flood riskSO23 9AY: high flood riskSO23 9BA: high flood riskSO23 9BG: high flood riskSO23 9JX: high flood riskSO23 9LH: high flood riskSO23 9LN: high flood riskSO23 9NG: high flood riskSO23 9RU: high flood risk WinchesterKings Worthy 13 postcodes at high or medium risk, outlined: this goes to SO23 9BA, the one with most homes and businesses at high risk13 postcodes at high or medium risk Map of every postcode in SO23, by flood risk Of the 812 postcodes in SO23 that ONS places, 20 have a home or business at high risk, 5 are at medium risk at worst, 27 are at low risk at worst, 5 are at very low risk only and 755 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 13 postcodes at high or medium risk. One postcode lies beyond the edge and is listed under the map. Places named: Winchester, Kings Worthy. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. M3 WinchesterKings Worthy 13 postcodes at high or medium risk, outlined: this goes to SO23 9BA, the one with most homes and businesses at high risk13 postcodes at high or medium risk
  • A home or business at high risk: 20
  • At medium risk at worst: 5
  • At low risk at worst: 27
  • At very low risk only: 5
  • Not on the at-risk list: 755
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 812 postcodes in SO23 that ONS places, 20 have a home or business at high risk, 5 are at medium risk at worst, 27 are at low risk at worst, 5 are at very low risk only and 755 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 51.0688, longitude -1.3087. 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

20 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.

SO23 9BA18 at high riskSO23 9AY15 at high riskSO23 8DX13 at high riskSO23 7LE10 at high riskSO23 9LG10 at high riskSO23 9LH8 at high riskSO23 9JX7 at high riskSO23 7LA4 at high riskSO23 7LF4 at high riskSO23 9RU3 at high riskSO23 7LJ2 at high riskSO23 9BG2 at high risk

Further out, not drawn

This postcode lies well apart from the rest, so the map is drawn without it to show the rest closer; it is in every count.

SO23 9RZ

Where the postcodes at high or medium risk lie together

  • 13 postcodes at high or medium risk, outlined on the map. SO23 9BA, is the one with most homes and businesses at high risk.

What broadband can you get in SO23?

Ofcom reports on 691 of the 812 postcodes in SO23. At 256 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit256 of 691
Postcodes where every home can get superfast620 of 691

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 SO23 at risk of flooding?

57 of the 812 postcodes in SO23 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 136 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 57 of 812 postcodes High: 105Medium: 31Low: 202Very low: 99

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 SO23?

Homes in SO23 sold for a typical £467,500 in the 12 months to August 2026, across 283 sales, down 7.4% on the 12 months before, HM Land Registry's figures show.

£467,500 typical price, the 12 months to August 2026
£505,000 12 months to August 2025
▼ down 7.4% on the 12 months before
  • Detached £820,000 48 sales
  • Semi-detached £510,000 59 sales
  • Terraced £490,000 99 sales
  • Flat or maisonette £260,000 77 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 SO23

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

SO23 0131 postcodesSO23 368 postcodesSO23 521 postcodesSO23 7277 postcodesSO23 8120 postcodesSO23 9195 postcodes
UK postcode format explained

Places in SO23

Towns and villages with postcodes in SO23, and how many each has here.

Winchester postcodes,680Kings Worthy postcodes,126

Who covers SO23

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

  • Winchester812

Police force areas

  • Hampshire812

Next to SO23

SO22 postcode district SO24 postcode district All SO districts Winchester postcodes

"Next to" is by number: the districts before and after SO23 in the SO area.

Check a postcode

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