S21 4 postcode sector in the S21 district

S21 4 is a sector of the S21 district: every postcode that starts S21 4. It has 170 postcodes in use, one of them a large-user postcode. A large-user postcode is one Royal Mail gives to a single address that gets a lot of mail.

Not sure what a sector is? UK postcode format explained.

Every postcode in the S21 4 sector, by flood risk

Map of every postcode in the S21 4 sector, by flood risk Of the 170 postcodes in the S21 4 sector that ONS places, 4 have a home or business at high risk, 1 are at low risk at worst and 165 are not on the Environment Agency's at-risk list. 2 postcodes lie beyond the edge and are listed under the map. Places named: Eckington. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A6135 S21 4AA: not on the flood risk listS21 4AB: not on the flood risk listS21 4AD: not on the flood risk listS21 4AE: not on the flood risk listS21 4AF: not on the flood risk listS21 4AG: not on the flood risk listS21 4AH: not on the flood risk listS21 4AJ: not on the flood risk listS21 4AL: not on the flood risk listS21 4AN: not on the flood risk listS21 4AP: not on the flood risk listS21 4AQ: not on the flood risk listS21 4AR: not on the flood risk listS21 4AS: not on the flood risk listS21 4AT: not on the flood risk listS21 4AU: not on the flood risk listS21 4AW: not on the flood risk listS21 4AX: not on the flood risk listS21 4AY: not on the flood risk listS21 4AZ: not on the flood risk listS21 4BA: not on the flood risk listS21 4BB: not on the flood risk listS21 4BD: not on the flood risk listS21 4BE: not on the flood risk listS21 4BF: not on the flood risk listS21 4BG: not on the flood risk listS21 4BJ: not on the flood risk listS21 4BL: not on the flood risk listS21 4BN: not on the flood risk listS21 4BP: not on the flood risk listS21 4BQ: not on the flood risk listS21 4BR: not on the flood risk listS21 4BS: not on the flood risk listS21 4BT: not on the flood risk listS21 4BU: not on the flood risk listS21 4BW: not on the flood risk listS21 4BX: not on the flood risk listS21 4BY: not on the flood risk listS21 4BZ: not on the flood risk listS21 4DA: not on the flood risk listS21 4DB: not on the flood risk listS21 4DD: not on the flood risk listS21 4DE: not on the flood risk listS21 4DF: not on the flood risk listS21 4DG: not on the flood risk listS21 4DH: not on the flood risk listS21 4DJ: not on the flood risk listS21 4DL: not on the flood risk listS21 4DN: not on the flood risk listS21 4DQ: not on the flood risk listS21 4DR: not on the flood risk listS21 4DS: not on the flood risk listS21 4DT: not on the flood risk listS21 4DU: not on the flood risk listS21 4DW: not on the flood risk listS21 4DX: not on the flood risk listS21 4DY: not on the flood risk listS21 4DZ: not on the flood risk listS21 4EA: not on the flood risk listS21 4EB: not on the flood risk listS21 4ED: not on the flood risk listS21 4EE: not on the flood risk listS21 4EF: not on the flood risk listS21 4EG: not on the flood risk listS21 4EH: not on the flood risk listS21 4EL: not on the flood risk listS21 4EN: not on the flood risk listS21 4EP: not on the flood risk listS21 4EQ: not on the flood risk listS21 4ES: not on the flood risk listS21 4ET: not on the flood risk listS21 4EU: not on the flood risk listS21 4EW: not on the flood risk listS21 4EX: not on the flood risk listS21 4EY: not on the flood risk listS21 4EZ: not on the flood risk listS21 4FA: not on the flood risk listS21 4FB: not on the flood risk listS21 4FD: not on the flood risk listS21 4FE: not on the flood risk listS21 4FF: not on the flood risk listS21 4FG: not on the flood risk listS21 4FJ: not on the flood risk listS21 4FL: not on the flood risk listS21 4FN: not on the flood risk listS21 4FP: not on the flood risk listS21 4FQ: not on the flood risk listS21 4FR: not on the flood risk listS21 4FS: not on the flood risk listS21 4FT: not on the flood risk listS21 4FU: not on the flood risk listS21 4FW: not on the flood risk listS21 4FX: not on the flood risk listS21 4FY: not on the flood risk listS21 4FZ: not on the flood risk listS21 4GA: not on the flood risk listS21 4GB: not on the flood risk listS21 4GD: not on the flood risk listS21 4GE: not on the flood risk listS21 4GG: not on the flood risk listS21 4GJ: not on the flood risk listS21 4GL: not on the flood risk listS21 4GN: not on the flood risk listS21 4GP: not on the flood risk listS21 4GQ: not on the flood risk listS21 4GR: not on the flood risk listS21 4GS: not on the flood risk listS21 4GT: not on the flood risk listS21 4GU: not on the flood risk listS21 4GW: not on the flood risk listS21 4GX: not on the flood risk listS21 4GY: not on the flood risk listS21 4GZ: not on the flood risk listS21 4HA: not on the flood risk listS21 4HB: not on the flood risk listS21 4HD: not on the flood risk listS21 4HE: not on the flood risk listS21 4HF: not on the flood risk listS21 4HG: not on the flood risk listS21 4HH: not on the flood risk listS21 4HJ: not on the flood risk listS21 4HN: not on the flood risk listS21 4HP: not on the flood risk listS21 4HQ: not on the flood risk listS21 4HR: not on the flood risk listS21 4HS: not on the flood risk listS21 4HT: not on the flood risk listS21 4HU: not on the flood risk listS21 4HW: not on the flood risk listS21 4HX: not on the flood risk listS21 4HY: not on the flood risk listS21 4HZ: not on the flood risk listS21 4JA: not on the flood risk listS21 4JB: not on the flood risk listS21 4JD: not on the flood risk listS21 4JE: not on the flood risk listS21 4JF: not on the flood risk listS21 4JG: not on the flood risk listS21 4JH: not on the flood risk listS21 4JJ: not on the flood risk listS21 4JL: not on the flood risk listS21 4JN: not on the flood risk listS21 4JR: not on the flood risk listS21 4JS: not on the flood risk listS21 4JT: not on the flood risk listS21 4JU: not on the flood risk listS21 4JW: not on the flood risk listS21 4JX: not on the flood risk listS21 4JY: not on the flood risk listS21 4JZ: not on the flood risk listS21 4LA: not on the flood risk listS21 4LB: not on the flood risk listS21 4LE: not on the flood risk listS21 4LF: not on the flood risk listS21 4LG: not on the flood risk listS21 4LH: not on the flood risk listS21 4LJ: not on the flood risk listS21 4LL: not on the flood risk listS21 4LP: not on the flood risk listS21 4LQ: not on the flood risk listS21 4LT: not on the flood risk listS21 4WZ: not on the flood risk listS21 4YF: not on the flood risk listS21 4BH: low flood risk at worstS21 4FH: high flood riskS21 4HL: high flood riskS21 4LN: high flood riskS21 4LS: high flood risk Eckington Map of every postcode in the S21 4 sector, by flood risk Of the 170 postcodes in the S21 4 sector that ONS places, 4 have a home or business at high risk, 1 are at low risk at worst and 165 are not on the Environment Agency's at-risk list. 2 postcodes lie beyond the edge and are listed under the map. Places named: Eckington. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Eckington
  • A home or business at high risk: 4
  • At medium risk at worst: 0
  • At low risk at worst: 1
  • At very low risk only: 0
  • Not on the at-risk list: 165

Of the 170 postcodes in the S21 4 sector that ONS places, 4 have a home or business at high risk, 1 are at low risk at worst and 165 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.

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.

S21 4HL17 at high riskS21 4FH6 at high riskS21 4LS4 at high riskS21 4LN3 at high risk

2 further out, not drawn

These postcodes lie well apart from the rest, so the map is drawn without them to show the rest closer; they are in every count.

S21 4EJS21 4GF

What do homes sell for in S21 4?

Homes in S21 4 sold for a typical £220,000 in the 12 months to August 2026, across 76 sales, up 18.9% on the 12 months before, HM Land Registry's figures show.

£220,000 typical price, the 12 months to August 2026
£185,000 12 months to August 2025
▲ up 18.9% on the 12 months before
  • Detached £331,500 30 sales
  • Semi-detached £177,500 23 sales
  • Terraced £163,500 19 sales
  • Flat or maisonette 4 sales, too few to price

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

Standard sales of homes at market value at the postcodes that start S21 4. A typical price is the median, the middle sale, given from 5 sales or more.

How we work this out: house prices by postcode

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 S21 4

Pick a postcode to see its council and MP, broadband, flood risk, what homes sell for, council tax, the nearest schools and stations, and crime around it.

S21 4AAS21 4ABS21 4ADS21 4AES21 4AFS21 4AGS21 4AHS21 4AJS21 4ALS21 4ANS21 4APS21 4AQS21 4ARS21 4ASS21 4ATS21 4AUS21 4AWS21 4AXS21 4AYS21 4AZS21 4BAS21 4BBS21 4BDS21 4BES21 4BFS21 4BGS21 4BHS21 4BJS21 4BLS21 4BNS21 4BPS21 4BQS21 4BRS21 4BSS21 4BTS21 4BUS21 4BWS21 4BXS21 4BYS21 4BZS21 4DAS21 4DBS21 4DDS21 4DES21 4DFS21 4DGS21 4DHS21 4DJS21 4DLS21 4DNS21 4DQS21 4DRS21 4DSS21 4DTS21 4DUS21 4DWS21 4DXS21 4DYS21 4DZS21 4EAS21 4EBS21 4EDS21 4EES21 4EFS21 4EGS21 4EHS21 4EJS21 4ELS21 4ENS21 4EPS21 4EQS21 4ESS21 4ETS21 4EUS21 4EWS21 4EXS21 4EYS21 4EZS21 4FAS21 4FBS21 4FDS21 4FES21 4FFS21 4FGS21 4FHS21 4FJS21 4FLS21 4FNS21 4FPS21 4FQS21 4FRS21 4FSS21 4FTS21 4FUS21 4FWS21 4FXS21 4FYS21 4FZS21 4GAS21 4GBS21 4GDS21 4GES21 4GFS21 4GGS21 4GJS21 4GLS21 4GNS21 4GPS21 4GQS21 4GRS21 4GSS21 4GTS21 4GUS21 4GWS21 4GXS21 4GYS21 4GZS21 4HAS21 4HBS21 4HDS21 4HES21 4HFS21 4HGS21 4HHS21 4HJS21 4HLS21 4HNS21 4HPS21 4HQS21 4HRS21 4HSS21 4HTS21 4HUS21 4HWS21 4HXS21 4HYS21 4HZS21 4JAS21 4JBS21 4JDS21 4JES21 4JFS21 4JGS21 4JHS21 4JJS21 4JLS21 4JNS21 4JRS21 4JSS21 4JTS21 4JUS21 4JWS21 4JXS21 4JYS21 4JZS21 4LAS21 4LBS21 4LES21 4LFS21 4LGS21 4LHS21 4LJS21 4LLS21 4LNS21 4LPS21 4LQS21 4LSS21 4LTS21 4WZS21 4YF

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. Postcodes that have ended are not listed. See all our data sources

What council am I in? The council, borough or local authority for a postcode, and the county council where there is one. What ward am I in? The ward for a postcode, with its council, constituency and parish.

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