N21 3 postcode sector in the N21 district

N21 3 is a sector of the N21 district: every postcode that starts N21 3. It has 157 postcodes in use, 4 of them large-user postcodes. 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 N21 3 sector, by flood risk

Map of every postcode in the N21 3 sector, by flood risk Of the 157 postcodes in the N21 3 sector that ONS places, 157 are not on the Environment Agency's at-risk list. Places named: Winchmore Hill, Highfield. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. N21 3AA: not on the flood risk listN21 3AB: not on the flood risk listN21 3AD: not on the flood risk listN21 3AE: not on the flood risk listN21 3AG: not on the flood risk listN21 3AH: not on the flood risk listN21 3AJ: not on the flood risk listN21 3AL: not on the flood risk listN21 3AN: not on the flood risk listN21 3AP: not on the flood risk listN21 3AR: not on the flood risk listN21 3AS: not on the flood risk listN21 3AT: not on the flood risk listN21 3AU: not on the flood risk listN21 3AW: not on the flood risk listN21 3AX: not on the flood risk listN21 3AY: not on the flood risk listN21 3BA: not on the flood risk listN21 3BB: not on the flood risk listN21 3BD: not on the flood risk listN21 3BE: not on the flood risk listN21 3BF: not on the flood risk listN21 3BG: not on the flood risk listN21 3BH: not on the flood risk listN21 3BJ: not on the flood risk listN21 3BL: not on the flood risk listN21 3BN: not on the flood risk listN21 3BP: not on the flood risk listN21 3BQ: not on the flood risk listN21 3BS: not on the flood risk listN21 3BT: not on the flood risk listN21 3BU: not on the flood risk listN21 3BX: not on the flood risk listN21 3BY: not on the flood risk listN21 3DA: not on the flood risk listN21 3DB: not on the flood risk listN21 3DD: not on the flood risk listN21 3DE: not on the flood risk listN21 3DG: not on the flood risk listN21 3DH: not on the flood risk listN21 3DN: not on the flood risk listN21 3DP: not on the flood risk listN21 3DR: not on the flood risk listN21 3DS: not on the flood risk listN21 3DT: not on the flood risk listN21 3DU: not on the flood risk listN21 3DX: not on the flood risk listN21 3DY: not on the flood risk listN21 3EA: not on the flood risk listN21 3EB: not on the flood risk listN21 3ED: not on the flood risk listN21 3EE: not on the flood risk listN21 3EG: not on the flood risk listN21 3EH: not on the flood risk listN21 3EJ: not on the flood risk listN21 3EL: not on the flood risk listN21 3EN: not on the flood risk listN21 3EP: not on the flood risk listN21 3EQ: not on the flood risk listN21 3ER: not on the flood risk listN21 3ES: not on the flood risk listN21 3EU: not on the flood risk listN21 3HA: not on the flood risk listN21 3HB: not on the flood risk listN21 3HD: not on the flood risk listN21 3HE: not on the flood risk listN21 3HF: not on the flood risk listN21 3HG: not on the flood risk listN21 3HH: not on the flood risk listN21 3HJ: not on the flood risk listN21 3HL: not on the flood risk listN21 3HN: not on the flood risk listN21 3HP: not on the flood risk listN21 3HQ: not on the flood risk listN21 3HR: not on the flood risk listN21 3HS: not on the flood risk listN21 3HT: not on the flood risk listN21 3HU: not on the flood risk listN21 3HX: not on the flood risk listN21 3HY: not on the flood risk listN21 3JA: not on the flood risk listN21 3JB: not on the flood risk listN21 3JD: not on the flood risk listN21 3JE: not on the flood risk listN21 3JF: not on the flood risk listN21 3JH: not on the flood risk listN21 3JP: not on the flood risk listN21 3JQ: not on the flood risk listN21 3JR: not on the flood risk listN21 3JS: not on the flood risk listN21 3JT: not on the flood risk listN21 3JU: not on the flood risk listN21 3JX: not on the flood risk listN21 3JY: not on the flood risk listN21 3LA: not on the flood risk listN21 3LB: not on the flood risk listN21 3LD: not on the flood risk listN21 3LE: not on the flood risk listN21 3LG: not on the flood risk listN21 3LH: not on the flood risk listN21 3LJ: not on the flood risk listN21 3LL: not on the flood risk listN21 3LN: not on the flood risk listN21 3LP: not on the flood risk listN21 3LX: not on the flood risk listN21 3NA: not on the flood risk listN21 3NB: not on the flood risk listN21 3NE: not on the flood risk listN21 3NF: not on the flood risk listN21 3NG: not on the flood risk listN21 3NJ: not on the flood risk listN21 3NN: not on the flood risk listN21 3NP: not on the flood risk listN21 3NQ: not on the flood risk listN21 3NR: not on the flood risk listN21 3NS: not on the flood risk listN21 3NT: not on the flood risk listN21 3NU: not on the flood risk listN21 3NX: not on the flood risk listN21 3PA: not on the flood risk listN21 3PB: not on the flood risk listN21 3PD: not on the flood risk listN21 3PE: not on the flood risk listN21 3PG: not on the flood risk listN21 3PH: not on the flood risk listN21 3PJ: not on the flood risk listN21 3PL: not on the flood risk listN21 3PS: not on the flood risk listN21 3PT: not on the flood risk listN21 3PU: not on the flood risk listN21 3PX: not on the flood risk listN21 3PY: not on the flood risk listN21 3PZ: not on the flood risk listN21 3QA: not on the flood risk listN21 3QB: not on the flood risk listN21 3QD: not on the flood risk listN21 3QE: not on the flood risk listN21 3QG: not on the flood risk listN21 3QH: not on the flood risk listN21 3QJ: not on the flood risk listN21 3QL: not on the flood risk listN21 3QN: not on the flood risk listN21 3QP: not on the flood risk listN21 3RA: not on the flood risk listN21 3RB: not on the flood risk listN21 3RF: not on the flood risk listN21 3RL: not on the flood risk listN21 3RS: not on the flood risk listN21 3RU: not on the flood risk listN21 3RX: not on the flood risk listN21 3SA: not on the flood risk listN21 3SB: not on the flood risk listN21 3SD: not on the flood risk listN21 3SL: not on the flood risk listN21 3WL: not on the flood risk list Winchmore HillHighfield Map of every postcode in the N21 3 sector, by flood risk Of the 157 postcodes in the N21 3 sector that ONS places, 157 are not on the Environment Agency's at-risk list. Places named: Winchmore Hill, Highfield. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Winchmore HillHighfield
  • A home or business at high risk: 0
  • At medium risk at worst: 0
  • At low risk at worst: 0
  • At very low risk only: 0
  • Not on the at-risk list: 157

Of the 157 postcodes in the N21 3 sector that ONS places, 157 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. Names in italics are council wards: we hold no town or village names here.

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

What do homes sell for in N21 3?

Homes in N21 3 sold for a typical £620,000 in the 12 months to August 2026, across 60 sales, down 11.1% on the 12 months before, HM Land Registry's figures show.

£620,000 typical price, the 12 months to August 2026
£697,500 12 months to August 2025
▼ down 11.1% on the 12 months before
  • Detached £2,400,000 7 sales
  • Semi-detached £835,000 13 sales
  • Terraced £642,000 19 sales
  • Flat or maisonette £375,000 21 sales

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 N21 3. 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 N21 3

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.

N21 3AAN21 3ABN21 3ADN21 3AEN21 3AGN21 3AHN21 3AJN21 3ALN21 3ANN21 3APN21 3ARN21 3ASN21 3ATN21 3AUN21 3AWN21 3AXN21 3AYN21 3BAN21 3BBN21 3BDN21 3BEN21 3BFN21 3BGN21 3BHN21 3BJN21 3BLN21 3BNN21 3BPN21 3BQN21 3BSN21 3BTN21 3BUN21 3BXN21 3BYN21 3DAN21 3DBN21 3DDN21 3DEN21 3DGN21 3DHN21 3DNN21 3DPN21 3DRN21 3DSN21 3DTN21 3DUN21 3DXN21 3DYN21 3EAN21 3EBN21 3EDN21 3EEN21 3EGN21 3EHN21 3EJN21 3ELN21 3ENN21 3EPN21 3EQN21 3ERN21 3ESN21 3EUN21 3HAN21 3HBN21 3HDN21 3HEN21 3HFN21 3HGN21 3HHN21 3HJN21 3HLN21 3HNN21 3HPN21 3HQN21 3HRN21 3HSN21 3HTN21 3HUN21 3HXN21 3HYN21 3JAN21 3JBN21 3JDN21 3JEN21 3JFN21 3JHN21 3JPN21 3JQN21 3JRN21 3JSN21 3JTN21 3JUN21 3JXN21 3JYN21 3LAN21 3LBN21 3LDN21 3LEN21 3LGN21 3LHN21 3LJN21 3LLN21 3LNN21 3LPN21 3LXN21 3NAN21 3NBN21 3NEN21 3NFN21 3NGN21 3NJN21 3NLN21 3NNN21 3NPN21 3NQN21 3NRN21 3NSN21 3NTN21 3NUN21 3NXN21 3PAN21 3PBN21 3PDN21 3PEN21 3PGN21 3PHN21 3PJN21 3PLN21 3PSN21 3PTN21 3PUN21 3PXN21 3PYN21 3PZN21 3QAN21 3QBN21 3QDN21 3QEN21 3QGN21 3QHN21 3QJN21 3QLN21 3QNN21 3QPN21 3RAN21 3RBN21 3REN21 3RFN21 3RLN21 3RSN21 3RUN21 3RXN21 3SAN21 3SBN21 3SDN21 3SLN21 3WL

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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