SO20 postcode district: Winchester and around, Hampshire

SO20 is a postcode district in Hampshire, with 346 postcodes in use in 2 sectors. It has postcodes in Winchester. It is split between 2 councils: Test Valley (342 postcodes) and Winchester (4).

Postcodes in use
346
Sectors
2
Councils
2 councils
Places
Winchester

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

Every postcode in SO20, by flood risk

Map of every postcode in SO20, by flood risk Of the 346 postcodes in SO20 that ONS places, 27 have a home or business at high risk, 10 are at medium risk at worst, 10 are at low risk at worst and 299 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 10 postcodes at high or medium risk. Places named: Winchester, Kings Worthy. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. A30A34A272 SO20 6AA: not on the flood risk listSO20 6AB: not on the flood risk listSO20 6AD: not on the flood risk listSO20 6AF: not on the flood risk listSO20 6AL: not on the flood risk listSO20 6AN: not on the flood risk listSO20 6AP: not on the flood risk listSO20 6AQ: not on the flood risk listSO20 6AR: not on the flood risk listSO20 6AU: not on the flood risk listSO20 6AW: not on the flood risk listSO20 6AY: not on the flood risk listSO20 6BA: not on the flood risk listSO20 6BG: not on the flood risk listSO20 6BH: not on the flood risk listSO20 6BJ: not on the flood risk listSO20 6BL: not on the flood risk listSO20 6BN: not on the flood risk listSO20 6BP: not on the flood risk listSO20 6BS: not on the flood risk listSO20 6BT: not on the flood risk listSO20 6BU: not on the flood risk listSO20 6BW: not on the flood risk listSO20 6BX: not on the flood risk listSO20 6BY: not on the flood risk listSO20 6BZ: not on the flood risk listSO20 6DA: not on the flood risk listSO20 6DB: not on the flood risk listSO20 6DD: not on the flood risk listSO20 6DE: not on the flood risk listSO20 6DF: not on the flood risk listSO20 6DH: not on the flood risk listSO20 6DJ: not on the flood risk listSO20 6DL: not on the flood risk listSO20 6DN: not on the flood risk listSO20 6DQ: not on the flood risk listSO20 6DR: not on the flood risk listSO20 6DS: not on the flood risk listSO20 6DT: not on the flood risk listSO20 6DU: not on the flood risk listSO20 6DW: not on the flood risk listSO20 6DX: not on the flood risk listSO20 6DZ: not on the flood risk listSO20 6EA: not on the flood risk listSO20 6ED: not on the flood risk listSO20 6EG: not on the flood risk listSO20 6EJ: not on the flood risk listSO20 6EL: not on the flood risk listSO20 6EN: not on the flood risk listSO20 6EQ: not on the flood risk listSO20 6EW: not on the flood risk listSO20 6EZ: not on the flood risk listSO20 6FB: not on the flood risk listSO20 6FE: not on the flood risk listSO20 6FF: not on the flood risk listSO20 6FY: not on the flood risk listSO20 6HA: not on the flood risk listSO20 6HH: not on the flood risk listSO20 6HJ: not on the flood risk listSO20 6HN: not on the flood risk listSO20 6HP: not on the flood risk listSO20 6HS: not on the flood risk listSO20 6HW: not on the flood risk listSO20 6HZ: not on the flood risk listSO20 6JA: not on the flood risk listSO20 6JE: not on the flood risk listSO20 6JF: not on the flood risk listSO20 6JH: not on the flood risk listSO20 6JJ: not on the flood risk listSO20 6JP: not on the flood risk listSO20 6JQ: not on the flood risk listSO20 6JR: not on the flood risk listSO20 6JS: not on the flood risk listSO20 6JT: not on the flood risk listSO20 6JU: not on the flood risk listSO20 6JX: not on the flood risk listSO20 6JY: not on the flood risk listSO20 6LE: not on the flood risk listSO20 6LF: not on the flood risk listSO20 6LG: not on the flood risk listSO20 6LH: not on the flood risk listSO20 6LJ: not on the flood risk listSO20 6LL: not on the flood risk listSO20 6LN: not on the flood risk listSO20 6LP: not on the flood risk listSO20 6LQ: not on the flood risk listSO20 6LZ: not on the flood risk listSO20 6NJ: not on the flood risk listSO20 6NL: not on the flood risk listSO20 6NN: not on the flood risk listSO20 6NW: not on the flood risk listSO20 6PD: not on the flood risk listSO20 6PG: not on the flood risk listSO20 6PH: not on the flood risk listSO20 6PJ: not on the flood risk listSO20 6PP: not on the flood risk listSO20 6PQ: not on the flood risk listSO20 6PS: not on the flood risk listSO20 6PT: not on the flood risk listSO20 6PY: not on the flood risk listSO20 6QA: not on the flood risk listSO20 6QF: not on the flood risk listSO20 6QG: not on the flood risk listSO20 6QH: not on the flood risk listSO20 6QJ: not on the flood risk listSO20 6QL: not on the flood risk listSO20 6QN: not on the flood risk listSO20 6QP: not on the flood risk listSO20 6QS: not on the flood risk listSO20 6QT: not on the flood risk listSO20 6QU: not on the flood risk listSO20 6QW: not on the flood risk listSO20 6QX: not on the flood risk listSO20 6QY: not on the flood risk listSO20 6QZ: not on the flood risk listSO20 6RA: not on the flood risk listSO20 6RE: not on the flood risk listSO20 6RF: not on the flood risk listSO20 6RH: not on the flood risk listSO20 6RJ: not on the flood risk listSO20 6RL: not on the flood risk listSO20 6RQ: not on the flood risk listSO20 6RX: not on the flood risk listSO20 6SA: not on the flood risk listSO20 6WP: not on the flood risk listSO20 8AA: not on the flood risk listSO20 8AB: not on the flood risk listSO20 8AD: not on the flood risk listSO20 8AF: not on the flood risk listSO20 8AG: not on the flood risk listSO20 8AN: not on the flood risk listSO20 8AX: not on the flood risk listSO20 8BA: not on the flood risk listSO20 8BB: not on the flood risk listSO20 8BE: not on the flood risk listSO20 8BG: not on the flood risk listSO20 8BH: not on the flood risk listSO20 8BL: not on the flood risk listSO20 8BS: not on the flood risk listSO20 8BU: not on the flood risk listSO20 8BX: not on the flood risk listSO20 8BY: not on the flood risk listSO20 8BZ: not on the flood risk listSO20 8DB: not on the flood risk listSO20 8DF: not on the flood risk listSO20 8DG: not on the flood risk listSO20 8DH: not on the flood risk listSO20 8DJ: not on the flood risk listSO20 8DL: not on the flood risk listSO20 8DN: not on the flood risk listSO20 8DP: not on the flood risk listSO20 8DQ: not on the flood risk listSO20 8DR: not on the flood risk listSO20 8DS: not on the flood risk listSO20 8DT: not on the flood risk listSO20 8DU: not on the flood risk listSO20 8DX: not on the flood risk listSO20 8DY: not on the flood risk listSO20 8DZ: not on the flood risk listSO20 8EA: not on the flood risk listSO20 8EE: not on the flood risk listSO20 8EF: not on the flood risk listSO20 8EH: not on the flood risk listSO20 8EJ: not on the flood risk listSO20 8ER: not on the flood risk listSO20 8EY: not on the flood risk listSO20 8EZ: not on the flood risk listSO20 8FB: not on the flood risk listSO20 8GA: not on the flood risk listSO20 8GR: not on the flood risk listSO20 8GT: not on the flood risk listSO20 8HA: not on the flood risk listSO20 8HB: not on the flood risk listSO20 8HE: not on the flood risk listSO20 8HF: not on the flood risk listSO20 8HQ: not on the flood risk listSO20 8HT: not on the flood risk listSO20 8HW: not on the flood risk listSO20 8HX: not on the flood risk listSO20 8HY: not on the flood risk listSO20 8HZ: not on the flood risk listSO20 8JA: not on the flood risk listSO20 8JB: not on the flood risk listSO20 8JH: not on the flood risk listSO20 8JJ: not on the flood risk listSO20 8JL: not on the flood risk listSO20 8JN: not on the flood risk listSO20 8JP: not on the flood risk listSO20 8JQ: not on the flood risk listSO20 8JS: not on the flood risk listSO20 8JT: not on the flood risk listSO20 8JU: not on the flood risk listSO20 8JZ: not on the flood risk listSO20 8LA: not on the flood risk listSO20 8LB: not on the flood risk listSO20 8LL: not on the flood risk listSO20 8QA: not on the flood risk listSO20 8QD: not on the flood risk listSO20 8QP: not on the flood risk listSO20 8QT: not on the flood risk listSO20 6BD: low flood risk at worstSO20 6BE: low flood risk at worstSO20 6PA: low flood risk at worstSO20 8EL: low flood risk at worstSO20 8EN: low flood risk at worstSO20 8HU: low flood risk at worstSO20 6AZ: medium flood risk at worstSO20 6BB: medium flood risk at worstSO20 6EF: medium flood risk at worstSO20 6PZ: medium flood risk at worstSO20 6PF: medium flood risk at worstSO20 6PW: medium flood risk at worstSO20 6PU: medium flood risk at worstSO20 8AY: medium flood risk at worstSO20 6AX: high flood riskSO20 6DG: high flood riskSO20 6DP: high flood riskSO20 6EH: high flood riskSO20 6ES: high flood riskSO20 6EU: high flood riskSO20 6EX: high flood riskSO20 6HE: high flood riskSO20 6JB: high flood riskSO20 6JG: high flood riskSO20 6NA: high flood riskSO20 6NG: high flood riskSO20 6PL: high flood riskSO20 6QR: high flood riskSO20 8AZ: high flood riskSO20 8BD: high flood riskSO20 8HP: high flood riskSO20 8EW: high flood riskSO20 8EQ: high flood riskSO20 8ET: high flood riskSO20 8HN: high flood risk WinchesterKings Worthy 10 postcodes at high or medium risk, outlined: this goes to SO20 6HF, the one with most homes and businesses at high risk10 postcodes at high or medium risk Map of every postcode in SO20, by flood risk Of the 346 postcodes in SO20 that ONS places, 27 have a home or business at high risk, 10 are at medium risk at worst, 10 are at low risk at worst and 299 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 10 postcodes at high or medium risk. Places named: Winchester, Kings Worthy. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 5 km. A34 WinchesterKings Worthy
  • A home or business at high risk: 27
  • At medium risk at worst: 10
  • At low risk at worst: 10
  • At very low risk only: 0
  • Not on the at-risk list: 299
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 346 postcodes in SO20 that ONS places, 27 have a home or business at high risk, 10 are at medium risk at worst, 10 are at low risk at worst and 299 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 260 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 51.1164, longitude -1.5163. 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

27 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.

SO20 6HF42 at high riskSO20 6EU32 at high riskSO20 6HE20 at high riskSO20 6EX18 at high riskSO20 6NZ13 at high riskSO20 6HB11 at high riskSO20 6EY7 at high riskSO20 6ES7 at high riskSO20 6ET6 at high riskSO20 8EW5 at high riskSO20 6DG4 at high riskSO20 8EX3 at high risk

Where the postcodes at high or medium risk lie together

  • 10 postcodes at high or medium risk, outlined on the map. SO20 6HF, is the one with most homes and businesses at high risk.

What broadband can you get in SO20?

Ofcom reports on 341 of the 346 postcodes in SO20. At 108 of them every home and business can get gigabit broadband, and at 19 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit108 of 341
Postcodes where every home can get superfast252 of 341
Postcodes where some cannot get decent broadband19 of 341

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 SO20 at risk of flooding?

47 of the 346 postcodes in SO20 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 288 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 47 of 346 postcodes High: 187Medium: 101Low: 134

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 SO20?

Homes in SO20 sold for a typical £595,000 in the 12 months to August 2026, across 65 sales, up 4.2% on the 12 months before, HM Land Registry's figures show.

£595,000 typical price, the 12 months to August 2026
12 months to August 2025
£571,102
12 months to August 2026
£595,000

▲ up 4.2% on the 12 months before

Detached£740,750 34 sales
Semi-detached£428,000 16 sales
Terraced£447,500 10 sales
Flat or maisonette£210,000 5 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 SO20

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

SO20 6198 postcodesSO20 8148 postcodes
UK postcode format explained

Places in SO20

Towns and villages with postcodes in SO20, and how many each has here.

Winchester postcodes,3

Who covers SO20

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

  • Romsey and Southampton North342
  • Winchester4

Police force areas

  • Hampshire346

Next to SO20

SO19 postcode district SO21 postcode district All SO districts Winchester postcodes

"Next to" is by number: the districts before and after SO20 in the SO area.

Check a postcode

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