SO21 postcode district: Colden Common and around, Hampshire

SO21 is a postcode district in Hampshire, with 743 postcodes in use in 3 sectors. It has postcodes in Colden Common, Twyford, Winchester, Eastleigh and 2 more places. It is split between 4 councils: Winchester (692 postcodes), Test Valley (43), Basingstoke and Deane (7) and 1 other.

Postcodes in use
743
Sectors
3
Councils
4 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 SO21, by flood risk

Map of every postcode in SO21, by flood risk Of the 743 postcodes in SO21 that ONS places, 20 have a home or business at high risk, 8 are at medium risk at worst, 10 are at low risk at worst, 10 are at very low risk only and 695 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 5 postcodes at high or medium risk. Places named: Colden Common, Winchester, Chandler's Ford, New Alresford, Kings Worthy, Twyford, Winchester. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A272A3057A34A31 SO21 1AA: not on the flood risk listSO21 1AB: not on the flood risk listSO21 1AD: not on the flood risk listSO21 1AE: not on the flood risk listSO21 1AG: not on the flood risk listSO21 1AH: not on the flood risk listSO21 1AL: not on the flood risk listSO21 1AN: not on the flood risk listSO21 1AQ: not on the flood risk listSO21 1AR: not on the flood risk listSO21 1AS: not on the flood risk listSO21 1AT: not on the flood risk listSO21 1AU: not on the flood risk listSO21 1AW: not on the flood risk listSO21 1AX: not on the flood risk listSO21 1AY: not on the flood risk listSO21 1AZ: not on the flood risk listSO21 1BH: not on the flood risk listSO21 1BL: not on the flood risk listSO21 1BN: not on the flood risk listSO21 1BP: not on the flood risk listSO21 1BS: not on the flood risk listSO21 1BT: not on the flood risk listSO21 1BU: not on the flood risk listSO21 1BW: not on the flood risk listSO21 1BX: not on the flood risk listSO21 1BY: not on the flood risk listSO21 1DD: not on the flood risk listSO21 1DG: not on the flood risk listSO21 1DQ: not on the flood risk listSO21 1DR: not on the flood risk listSO21 1DS: not on the flood risk listSO21 1DT: not on the flood risk listSO21 1DW: not on the flood risk listSO21 1DX: not on the flood risk listSO21 1DY: not on the flood risk listSO21 1DZ: not on the flood risk listSO21 1ED: not on the flood risk listSO21 1EE: not on the flood risk listSO21 1EF: not on the flood risk listSO21 1EG: not on the flood risk listSO21 1EJ: not on the flood risk listSO21 1EN: not on the flood risk listSO21 1EQ: not on the flood risk listSO21 1ES: not on the flood risk listSO21 1ET: not on the flood risk listSO21 1EU: not on the flood risk listSO21 1EX: not on the flood risk listSO21 1EZ: not on the flood risk listSO21 1FA: not on the flood risk listSO21 1FB: not on the flood risk listSO21 1FE: not on the flood risk listSO21 1FF: not on the flood risk listSO21 1FH: not on the flood risk listSO21 1FL: not on the flood risk listSO21 1FN: not on the flood risk listSO21 1FP: not on the flood risk listSO21 1FQ: not on the flood risk listSO21 1FR: not on the flood risk listSO21 1FS: not on the flood risk listSO21 1FT: not on the flood risk listSO21 1FU: not on the flood risk listSO21 1FW: not on the flood risk listSO21 1FZ: not on the flood risk listSO21 1GA: not on the flood risk listSO21 1GG: not on the flood risk listSO21 1GJ: not on the flood risk listSO21 1GL: not on the flood risk listSO21 1GN: not on the flood risk listSO21 1HA: not on the flood risk listSO21 1HB: not on the flood risk listSO21 1HD: not on the flood risk listSO21 1HE: not on the flood risk listSO21 1HF: not on the flood risk listSO21 1HG: not on the flood risk listSO21 1HH: not on the flood risk listSO21 1HJ: not on the flood risk listSO21 1HL: not on the flood risk listSO21 1HN: not on the flood risk listSO21 1HP: not on the flood risk listSO21 1HQ: not on the flood risk listSO21 1HR: not on the flood risk listSO21 1HS: not on the flood risk listSO21 1HT: not on the flood risk listSO21 1HU: not on the flood risk listSO21 1HW: not on the flood risk listSO21 1HZ: not on the flood risk listSO21 1JD: not on the flood risk listSO21 1JE: not on the flood risk listSO21 1JF: not on the flood risk listSO21 1JG: not on the flood risk listSO21 1JH: not on the flood risk listSO21 1JJ: not on the flood risk listSO21 1JL: not on the flood risk listSO21 1JN: not on the flood risk listSO21 1JP: not on the flood risk listSO21 1JQ: not on the flood risk listSO21 1JR: not on the flood risk listSO21 1JS: not on the flood risk listSO21 1JT: not on the flood risk listSO21 1JU: not on the flood risk listSO21 1JW: not on the flood risk listSO21 1JX: not on the flood risk listSO21 1JY: not on the flood risk listSO21 1JZ: not on the flood risk listSO21 1LA: not on the flood risk listSO21 1LB: not on the flood risk listSO21 1LD: not on the flood risk listSO21 1LE: not on the flood risk listSO21 1LF: not on the flood risk listSO21 1LG: not on the flood risk listSO21 1LL: not on the flood risk listSO21 1LN: not on the flood risk listSO21 1LP: not on the flood risk listSO21 1LR: not on the flood risk listSO21 1LS: not on the flood risk listSO21 1LT: not on the flood risk listSO21 1LX: not on the flood risk listSO21 1LY: not on the flood risk listSO21 1LZ: not on the flood risk listSO21 1NA: not on the flood risk listSO21 1NB: not on the flood risk listSO21 1NG: not on the flood risk listSO21 1NH: not on the flood risk listSO21 1NJ: not on the flood risk listSO21 1NN: not on the flood risk listSO21 1NP: not on the flood risk listSO21 1NR: not on the flood risk listSO21 1NU: not on the flood risk listSO21 1NW: not on the flood risk listSO21 1NX: not on the flood risk listSO21 1PA: not on the flood risk listSO21 1PH: not on the flood risk listSO21 1PJ: not on the flood risk listSO21 1PL: not on the flood risk listSO21 1PN: not on the flood risk listSO21 1PP: not on the flood risk listSO21 1PU: not on the flood risk listSO21 1PY: not on the flood risk listSO21 1PZ: not on the flood risk listSO21 1QA: not on the flood risk listSO21 1QN: not on the flood risk listSO21 1QU: not on the flood risk listSO21 1QX: not on the flood risk listSO21 1RA: not on the flood risk listSO21 1RD: not on the flood risk listSO21 1RG: not on the flood risk listSO21 1RL: not on the flood risk listSO21 1RN: not on the flood risk listSO21 1RP: not on the flood risk listSO21 1RR: not on the flood risk listSO21 1RT: not on the flood risk listSO21 1RW: not on the flood risk listSO21 1RZ: not on the flood risk listSO21 1SD: not on the flood risk listSO21 1SE: not on the flood risk listSO21 1SG: not on the flood risk listSO21 1SH: not on the flood risk listSO21 1TD: not on the flood risk listSO21 1TF: not on the flood risk listSO21 1TH: not on the flood risk listSO21 1TR: not on the flood risk listSO21 1TS: not on the flood risk listSO21 1TT: not on the flood risk listSO21 1TU: not on the flood risk listSO21 1TW: not on the flood risk listSO21 1UG: not on the flood risk listSO21 1UL: not on the flood risk listSO21 1UN: not on the flood risk listSO21 1UQ: not on the flood risk listSO21 1ZL: not on the flood risk listSO21 2AA: not on the flood risk listSO21 2AB: not on the flood risk listSO21 2AD: not on the flood risk listSO21 2AE: not on the flood risk listSO21 2AF: not on the flood risk listSO21 2AG: not on the flood risk listSO21 2AJ: not on the flood risk listSO21 2AL: not on the flood risk listSO21 2AN: not on the flood risk listSO21 2AP: not on the flood risk listSO21 2AQ: not on the flood risk listSO21 2AR: not on the flood risk listSO21 2AT: not on the flood risk listSO21 2AX: not on the flood risk listSO21 2AY: not on the flood risk listSO21 2AZ: not on the flood risk listSO21 2BA: not on the flood risk listSO21 2BB: not on the flood risk listSO21 2BD: not on the flood risk listSO21 2BE: not on the flood risk listSO21 2BG: not on the flood risk listSO21 2BJ: not on the flood risk listSO21 2BL: not on the flood risk listSO21 2BN: not on the flood risk listSO21 2BS: not on the flood risk listSO21 2BU: not on the flood risk listSO21 2BX: not on the flood risk listSO21 2BY: not on the flood risk listSO21 2BZ: not on the flood risk listSO21 2DA: not on the flood risk listSO21 2DB: not on the flood risk listSO21 2DD: not on the flood risk listSO21 2DF: not on the flood risk listSO21 2DG: not on the flood risk listSO21 2DJ: not on the flood risk listSO21 2DN: not on the flood risk listSO21 2DP: not on the flood risk listSO21 2DQ: not on the flood risk listSO21 2DR: not on the flood risk listSO21 2DX: not on the flood risk listSO21 2DY: not on the flood risk listSO21 2DZ: not on the flood risk listSO21 2EA: not on the flood risk listSO21 2EB: not on the flood risk listSO21 2ED: not on the flood risk listSO21 2EJ: not on the flood risk listSO21 2EN: not on the flood risk listSO21 2FA: not on the flood risk listSO21 2FF: not on the flood risk listSO21 2FH: not on the flood risk listSO21 2FJ: not on the flood risk listSO21 2FL: not on the flood risk listSO21 2FR: not on the flood risk listSO21 2FS: not on the flood risk listSO21 2FT: not on the flood risk listSO21 2FU: not on the flood risk listSO21 2HH: not on the flood risk listSO21 2HL: not on the flood risk listSO21 2HN: not on the flood risk listSO21 2HP: not on the flood risk listSO21 2HS: not on the flood risk listSO21 2HY: not on the flood risk listSO21 2HZ: not on the flood risk listSO21 2JA: not on the flood risk listSO21 2JE: not on the flood risk listSO21 2JG: not on the flood risk listSO21 2JH: not on the flood risk listSO21 2JL: not on the flood risk listSO21 2JN: not on the flood risk listSO21 2JP: not on the flood risk listSO21 2JQ: not on the flood risk listSO21 2JR: not on the flood risk listSO21 2JT: not on the flood risk listSO21 2JZ: not on the flood risk listSO21 2LA: not on the flood risk listSO21 2LB: not on the flood risk listSO21 2LD: not on the flood risk listSO21 2LE: not on the flood risk listSO21 2LG: not on the flood risk listSO21 2LJ: not on the flood risk listSO21 2LL: not on the flood risk listSO21 2LP: not on the flood risk listSO21 2LQ: not on the flood risk listSO21 2LR: not on the flood risk listSO21 2LS: not on the flood risk listSO21 2LT: not on the flood risk listSO21 2LU: not on the flood risk listSO21 2LX: not on the flood risk listSO21 2LY: not on the flood risk listSO21 2LZ: not on the flood risk listSO21 2NA: not on the flood risk listSO21 2NB: not on the flood risk listSO21 2ND: not on the flood risk listSO21 2NE: not on the flood risk listSO21 2NF: not on the flood risk listSO21 2NG: not on the flood risk listSO21 2NH: not on the flood risk listSO21 2NJ: not on the flood risk listSO21 2NQ: not on the flood risk listSO21 2NR: not on the flood risk listSO21 2NS: not on the flood risk listSO21 2NW: not on the flood risk listSO21 2NX: not on the flood risk listSO21 2NY: not on the flood risk listSO21 2NZ: not on the flood risk listSO21 2PA: not on the flood risk listSO21 2PD: not on the flood risk listSO21 2PH: not on the flood risk listSO21 2PJ: not on the flood risk listSO21 2PL: not on the flood risk listSO21 2PN: not on the flood risk listSO21 2PP: not on the flood risk listSO21 2PR: not on the flood risk listSO21 2PS: not on the flood risk listSO21 2PT: not on the flood risk listSO21 2PW: not on the flood risk listSO21 2PX: not on the flood risk listSO21 2PY: not on the flood risk listSO21 2PZ: not on the flood risk listSO21 2QA: not on the flood risk listSO21 2QB: not on the flood risk listSO21 2QD: not on the flood risk listSO21 2QE: not on the flood risk listSO21 2QF: not on the flood risk listSO21 2QG: not on the flood risk listSO21 2QP: not on the flood risk listSO21 2QT: not on the flood risk listSO21 2QU: not on the flood risk listSO21 2QW: not on the flood risk listSO21 2QY: not on the flood risk listSO21 2QZ: not on the flood risk listSO21 2RA: not on the flood risk listSO21 2RG: not on the flood risk listSO21 2RH: not on the flood risk listSO21 2RJ: not on the flood risk listSO21 2RP: not on the flood risk listSO21 2RR: not on the flood risk listSO21 2RU: not on the flood risk listSO21 2UZ: not on the flood risk listSO21 3AA: not on the flood risk listSO21 3AB: not on the flood risk listSO21 3AD: not on the flood risk listSO21 3AE: not on the flood risk listSO21 3AF: not on the flood risk listSO21 3AG: not on the flood risk listSO21 3AH: not on the flood risk listSO21 3AJ: not on the flood risk listSO21 3AL: not on the flood risk listSO21 3AN: not on the flood risk listSO21 3AP: not on the flood risk listSO21 3AQ: not on the flood risk listSO21 3AR: not on the flood risk listSO21 3AS: not on the flood risk listSO21 3AU: not on the flood risk listSO21 3AW: not on the flood risk listSO21 3AX: not on the flood risk listSO21 3AZ: not on the flood risk listSO21 3BA: not on the flood risk listSO21 3BB: not on the flood risk listSO21 3BD: not on the flood risk listSO21 3BE: not on the flood risk listSO21 3BF: not on the flood risk listSO21 3BG: not on the flood risk listSO21 3BH: not on the flood risk listSO21 3BJ: not on the flood risk listSO21 3BL: not on the flood risk listSO21 3BN: not on the flood risk listSO21 3BP: not on the flood risk listSO21 3BQ: not on the flood risk listSO21 3BS: not on the flood risk listSO21 3BT: not on the flood risk listSO21 3BU: not on the flood risk listSO21 3BX: not on the flood risk listSO21 3BY: not on the flood risk listSO21 3DA: not on the flood risk listSO21 3DG: not on the flood risk listSO21 3DJ: not on the flood risk listSO21 3DL: not on the flood risk listSO21 3DN: not on the flood risk listSO21 3DP: not on the flood risk listSO21 3DQ: not on the flood risk listSO21 3DR: not on the flood risk listSO21 3DS: not on the flood risk listSO21 3DU: not on the flood risk listSO21 3DW: not on the flood risk listSO21 3DX: not on the flood risk listSO21 3DZ: not on the flood risk listSO21 3EA: not on the flood risk listSO21 3EB: not on the flood risk listSO21 3ED: not on the flood risk listSO21 3EE: not on the flood risk listSO21 3EG: not on the flood risk listSO21 3EH: not on the flood risk listSO21 3EN: not on the flood risk listSO21 3EP: not on the flood risk listSO21 3ER: not on the flood risk listSO21 3ES: not on the flood risk listSO21 3ET: not on the flood risk listSO21 3EU: not on the flood risk listSO21 3EW: not on the flood risk listSO21 3EY: not on the flood risk listSO21 3FE: not on the flood risk listSO21 3FF: not on the flood risk listSO21 3FG: not on the flood risk listSO21 3FH: not on the flood risk listSO21 3FJ: not on the flood risk listSO21 3FL: not on the flood risk listSO21 3FN: not on the flood risk listSO21 3FQ: not on the flood risk listSO21 3FS: not on the flood risk listSO21 3FT: not on the flood risk listSO21 3FU: not on the flood risk listSO21 3FW: not on the flood risk listSO21 3FX: not on the flood risk listSO21 3FY: not on the flood risk listSO21 3GA: not on the flood risk listSO21 3GY: not on the flood risk listSO21 3HA: not on the flood risk listSO21 3HD: not on the flood risk listSO21 3HE: not on the flood risk listSO21 3HL: not on the flood risk listSO21 3HN: not on the flood risk listSO21 3HP: not on the flood risk listSO21 3HR: not on the flood risk listSO21 3HS: not on the flood risk listSO21 3HU: not on the flood risk listSO21 3HW: not on the flood risk listSO21 3JB: not on the flood risk listSO21 3JE: not on the flood risk listSO21 3JL: not on the flood risk listSO21 3JU: not on the flood risk listSO21 3JY: not on the flood risk listSO21 3LB: not on the flood risk listSO21 3LE: not on the flood risk listSO21 3LF: not on the flood risk listSO21 3LH: not on the flood risk listSO21 3LN: not on the flood risk listSO21 3LP: not on the flood risk listSO21 3LR: not on the flood risk listSO21 3LS: not on the flood risk listSO21 3LX: not on the flood risk listSO21 3NA: not on the flood risk listSO21 3NB: not on the flood risk listSO21 3ND: not on the flood risk listSO21 3NE: not on the flood risk listSO21 3NF: not on the flood risk listSO21 3NP: not on the flood risk listSO21 3NR: not on the flood risk listSO21 3NS: not on the flood risk listSO21 3NT: not on the flood risk listSO21 3NU: not on the flood risk listSO21 3NX: not on the flood risk listSO21 3NY: not on the flood risk listSO21 3NZ: not on the flood risk listSO21 3PA: not on the flood risk listSO21 3PB: not on the flood risk listSO21 3PD: not on the flood risk listSO21 3PE: not on the flood risk listSO21 3PG: not on the flood risk listSO21 3PH: not on the flood risk listSO21 3PL: not on the flood risk listSO21 3PN: not on the flood risk listSO21 3PP: not on the flood risk listSO21 3PR: not on the flood risk listSO21 3PS: not on the flood risk listSO21 3PT: not on the flood risk listSO21 3PX: not on the flood risk listSO21 3PY: not on the flood risk listSO21 3PZ: not on the flood risk listSO21 3QA: not on the flood risk listSO21 3QB: not on the flood risk listSO21 3QD: not on the flood risk listSO21 3QF: not on the flood risk listSO21 3QG: not on the flood risk listSO21 3QQ: not on the flood risk listSO21 3QS: not on the flood risk listSO21 3QX: not on the flood risk listSO21 3RB: not on the flood risk listSO21 3RD: not on the flood risk listSO21 3RE: not on the flood risk listSO21 3RF: not on the flood risk listSO21 3RJ: not on the flood risk listSO21 3RN: not on the flood risk listSO21 3RP: not on the flood risk listSO21 3RS: not on the flood risk listSO21 3RU: not on the flood risk listSO21 3RY: not on the flood risk listSO21 3SA: not on the flood risk listSO21 3SB: not on the flood risk listSO21 3SD: not on the flood risk listSO21 3SG: not on the flood risk listSO21 3SH: not on the flood risk listSO21 3SP: not on the flood risk listSO21 3SR: not on the flood risk listSO21 3ST: not on the flood risk listSO21 3TA: not on the flood risk listSO21 1TQ: very low flood risk onlySO21 1UX: very low flood risk onlySO21 1UW: very low flood risk onlySO21 1WP: very low flood risk onlySO21 2EG: very low flood risk onlySO21 2EP: very low flood risk onlySO21 2ES: very low flood risk onlySO21 2EU: very low flood risk onlySO21 1EB: low flood risk at worstSO21 1QJ: low flood risk at worstSO21 2DU: low flood risk at worstSO21 2HE: low flood risk at worstSO21 2LF: low flood risk at worstSO21 3LA: low flood risk at worstSO21 3LD: low flood risk at worstSO21 3PF: low flood risk at worstSO21 3RR: low flood risk at worstSO21 2EQ: medium flood risk at worstSO21 3DB: medium flood risk at worstSO21 3GX: medium flood risk at worstSO21 3JG: medium flood risk at worstSO21 3RA: medium flood risk at worstSO21 1BQ: high flood riskSO21 1BZ: high flood riskSO21 1DA: high flood riskSO21 1DB: high flood riskSO21 1DF: high flood riskSO21 1EH: high flood riskSO21 1NT: high flood riskSO21 1QF: high flood riskSO21 1TL: high flood riskSO21 2BP: high flood riskSO21 2EE: high flood riskSO21 2EL: high flood riskSO21 3BW: high flood riskSO21 3DD: high flood riskSO21 3DF: high flood riskSO21 3DT: high flood riskSO21 3FR: high flood riskSO21 3QJ: high flood riskSO21 3RH: high flood risk Colden CommonWinchesterChandler's FordNew AlresfordKings WorthyTwyford, Winchester 5 postcodes at high or medium risk, outlined: this goes to SO21 3JH, the one with most homes and businesses at high risk5 postcodes at high or medium risk Map of every postcode in SO21, by flood risk Of the 743 postcodes in SO21 that ONS places, 20 have a home or business at high risk, 8 are at medium risk at worst, 10 are at low risk at worst, 10 are at very low risk only and 695 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 5 postcodes at high or medium risk. Places named: Colden Common, Winchester, Chandler's Ford, Kings Worthy. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 5 km. A31 Colden CommonWinchesterChandler's FordKings Worthy
  • A home or business at high risk: 20
  • At medium risk at worst: 8
  • At low risk at worst: 10
  • At very low risk only: 10
  • Not on the at-risk list: 695
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 743 postcodes in SO21 that ONS places, 20 have a home or business at high risk, 8 are at medium risk at worst, 10 are at low risk at worst, 10 are at very low risk only and 695 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 240 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 51.0752, longitude -1.3166. 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.

SO21 1BZ10 at high riskSO21 2EE7 at high riskSO21 2EF6 at high riskSO21 3RH5 at high riskSO21 1BQ3 at high riskSO21 1TL3 at high riskSO21 3DF2 at high riskSO21 2BP2 at high riskSO21 3BW1 at high riskSO21 3DT1 at high riskSO21 3QJ1 at high riskSO21 1DA1 at high risk

Where the postcodes at high or medium risk lie together

  • 5 postcodes at high or medium risk, outlined on the map. SO21 3JH, is the one with most homes and businesses at high risk.

What broadband can you get in SO21?

Ofcom reports on 734 of the 743 postcodes in SO21. At 178 of them every home and business can get gigabit broadband, and at 15 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit178 of 734
Postcodes where every home can get superfast523 of 734
Postcodes where some cannot get decent broadband15 of 734

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 SO21 at risk of flooding?

48 of the 743 postcodes in SO21 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 77 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 48 of 743 postcodes High: 50Medium: 27Low: 64Very low: 65

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 SO21?

Homes in SO21 sold for a typical £529,000 in the 12 months to August 2026, across 190 sales, down 11.8% on the 12 months before, HM Land Registry's figures show.

£529,000 typical price, the 12 months to August 2026
£600,000 12 months to August 2025
▼ down 11.8% on the 12 months before
  • Detached £773,000 83 sales
  • Semi-detached £445,000 56 sales
  • Terraced £398,750 38 sales
  • Flat or maisonette £233,000 13 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 SO21

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

SO21 1299 postcodesSO21 2201 postcodesSO21 3243 postcodes
UK postcode format explained

Places in SO21

Towns and villages with postcodes in SO21, and how many each has here.

Colden Common postcodes,96Twyford, Winchester postcodes,60Eastleigh postcodes,11Winchester postcodes,8Kings Worthy postcodes,1

Who covers SO21

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

  • Winchester692
  • Romsey and Southampton North43
  • East Hampshire5
  • Basingstoke1
  • Eastleigh1
  • North West Hampshire1

Police force areas

  • Hampshire743

Next to SO21

SO20 postcode district SO22 postcode district All SO districts Colden Common postcodes

"Next to" is by number: the districts before and after SO21 in the SO area.

Check a postcode

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