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, and which are new since 2020

Map of every postcode in the N21 3 sector, by new since 2020 Of the 157 postcodes in the N21 3 sector that ONS places, 3 are new since 2020 and 154 were in use before 2020. Places named: Winchmore Hill, Highfield. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. N21 3AA: before 2020N21 3AB: before 2020N21 3AD: before 2020N21 3AE: before 2020N21 3AG: before 2020N21 3AH: before 2020N21 3AJ: before 2020N21 3AL: before 2020N21 3AN: before 2020N21 3AP: before 2020N21 3AR: before 2020N21 3AS: before 2020N21 3AT: before 2020N21 3AU: before 2020N21 3AW: before 2020N21 3AX: before 2020N21 3AY: before 2020N21 3BA: before 2020N21 3BB: before 2020N21 3BD: before 2020N21 3BE: before 2020N21 3BF: before 2020N21 3BG: before 2020N21 3BJ: before 2020N21 3BL: before 2020N21 3BN: before 2020N21 3BP: before 2020N21 3BQ: before 2020N21 3BS: before 2020N21 3BT: before 2020N21 3BU: before 2020N21 3BX: before 2020N21 3BY: before 2020N21 3DA: before 2020N21 3DB: before 2020N21 3DD: before 2020N21 3DE: before 2020N21 3DG: before 2020N21 3DH: before 2020N21 3DN: before 2020N21 3DP: before 2020N21 3DR: before 2020N21 3DS: before 2020N21 3DT: before 2020N21 3DU: before 2020N21 3DX: before 2020N21 3DY: before 2020N21 3EA: before 2020N21 3EB: before 2020N21 3ED: before 2020N21 3EE: before 2020N21 3EG: before 2020N21 3EH: before 2020N21 3EJ: before 2020N21 3EL: before 2020N21 3EN: before 2020N21 3EP: before 2020N21 3ER: before 2020N21 3ES: before 2020N21 3HA: before 2020N21 3HB: before 2020N21 3HD: before 2020N21 3HE: before 2020N21 3HF: before 2020N21 3HG: before 2020N21 3HH: before 2020N21 3HJ: before 2020N21 3HL: before 2020N21 3HN: before 2020N21 3HP: before 2020N21 3HQ: before 2020N21 3HR: before 2020N21 3HS: before 2020N21 3HT: before 2020N21 3HU: before 2020N21 3HX: before 2020N21 3HY: before 2020N21 3JA: before 2020N21 3JB: before 2020N21 3JD: before 2020N21 3JE: before 2020N21 3JF: before 2020N21 3JH: before 2020N21 3JP: before 2020N21 3JQ: before 2020N21 3JR: before 2020N21 3JS: before 2020N21 3JT: before 2020N21 3JU: before 2020N21 3JX: before 2020N21 3JY: before 2020N21 3LA: before 2020N21 3LB: before 2020N21 3LD: before 2020N21 3LE: before 2020N21 3LG: before 2020N21 3LH: before 2020N21 3LJ: before 2020N21 3LL: before 2020N21 3LN: before 2020N21 3LP: before 2020N21 3LX: before 2020N21 3NA: before 2020N21 3NB: before 2020N21 3NE: before 2020N21 3NF: before 2020N21 3NG: before 2020N21 3NJ: before 2020N21 3NN: before 2020N21 3NP: before 2020N21 3NQ: before 2020N21 3NR: before 2020N21 3NS: before 2020N21 3NT: before 2020N21 3NU: before 2020N21 3NX: before 2020N21 3PA: before 2020N21 3PB: before 2020N21 3PD: before 2020N21 3PE: before 2020N21 3PG: before 2020N21 3PH: before 2020N21 3PJ: before 2020N21 3PL: before 2020N21 3PS: before 2020N21 3PT: before 2020N21 3PU: before 2020N21 3PX: before 2020N21 3PY: before 2020N21 3PZ: before 2020N21 3QA: before 2020N21 3QB: before 2020N21 3QD: before 2020N21 3QE: before 2020N21 3QG: before 2020N21 3QH: before 2020N21 3QJ: before 2020N21 3QL: before 2020N21 3QN: before 2020N21 3QP: before 2020N21 3RA: before 2020N21 3RB: before 2020N21 3RF: before 2020N21 3RL: before 2020N21 3RS: before 2020N21 3RU: before 2020N21 3RX: before 2020N21 3SA: before 2020N21 3SB: before 2020N21 3SD: before 2020N21 3SL: before 2020N21 3WL: before 2020N21 3BH: new since 2020N21 3EQ: new since 2020N21 3EU: new since 2020 Winchmore HillHighfield Map of every postcode in the N21 3 sector, by new since 2020 Of the 157 postcodes in the N21 3 sector that ONS places, 3 are new since 2020 and 154 were in use before 2020. Places named: Winchmore Hill, Highfield. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Winchmore HillHighfield
  • New since 2020: 3
  • In use before 2020: 154

Of the 157 postcodes in the N21 3 sector that ONS places, 3 are new since 2020 and 154 were in use before 2020.

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. New since 2020 means it came into use in January 2020 or later. 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; when each came into use: the same directory; 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 3 newest postcodes

N21 3BHFebruary 2023N21 3EUAugust 2020N21 3EQApril 2020

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.

Check a postcode

Something wrong on this page? Report an error and we will check it against the source.