N3 postcode district

Postcodes and sectors

630 of the district's 1,209 postcodes are live in the ONS Postcode Directory of August 2026. A postcode directory says whether a code is in use, never who is there. The live postcodes centre on 51.60014, -0.19383, which locates the district, not a building.

Companies registered in N3

Companies House lists 15,179 companies with a registered office in N3; 9,969 of them at addresses shared by 25 or more companies (1 October 2026 snapshot). 25 is the count at which the address lookup reports a company cluster.

Places OS Open Names lists for N3

• Barnet
• Greater London
• London
• Finchley
• Hendon

Roads filed under N3

Named roads first, then numbered ones. A road is filed under one district even where it runs through several, so a street missing here may be listed under a neighbouring district — which is why the address lookup never calls a British street absent. Great Britain has no open register of buildings, so a listed road never means a building on it exists.

• Abingdon Road
• Adams Close
• Albert Place
• Allandale Avenue
• Amberden Avenue
• Arcadia Avenue
• Arden Road
• Ashridge Close
• Avondale Road
• Ballards Lane
• Barnet Bypass
• Basing Way
• Beechwood Avenue
• Bibsworth Road
• Bose Close
• Brent Way
• Briar Close
• Briarfield Avenue
• Broughton Avenue
• Brownlow Road
• Cadogan Gardens
• Cavendish Avenue
• Chalgrove Gardens
• Champagne Walk
• Charter Way
• Chessington Avenue
• Chesterfield Road
• Church Crescent
• Claigmar Gardens
• Clandon Gardens
• Claremont Park
• Claverley Grove
• Claverley Villas
• Clifton Avenue
• Clifton Road
• College Terrace
• Cornwall Avenue
• Court House Gardens
• Crescent Road
• Cromwell Road
• Crooked Usage
• Cyprus Avenue
• Cyprus Gardens
• Cyprus Road
• Dickens Avenue
• Dollis Avenue
• Dollis Mews
• Dollis Park
• Dollis Road
• Dolman Close
• Dorset Mews
• Dudley Road
• Dukes Avenue
• Edge Hill Avenue
• Edgewood Mews
• Eger Close
• Elm Park Road
• Essex Park
• Etchingham Park Road
• Eversleigh Road

Check an address in N3

Check an address in N3

The same road list through the API, from the outward code alone:

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=N3" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about N3

What does an N3 postcode tell you?

That the address lies in the N3 district of the N (North London) postcode area, and the place OS Open Names most often lists first for its postcodes is Finchley. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 630 live postcodes.

Where the counts come from

• ons-postcode-directory · version 2026-08 · Contains ONS, OS and Royal Mail data © Crown copyright and database right 2026, Open Government Licence v3.0. Northern Ireland postcodes are excluded: their reuse needs a Land & Property Services licence.
• os-open-names · version 2026-11-01 · Contains OS data © Crown copyright and database right 2026, Open Government Licence v3.0.
• uk-companies-house · version 2026-10-01 · Companies House free company data product, Open Government Licence v3.0

What each figure means, and what a district page never says, is set out in Reading a British postcode district page; the glossary defines a postcode district, a postcode area, a postcode directory and a street register.

Data synced on 2026-11-01: the newest version among the datasets listed above.

Districts nearest N3

• N122.0 km
• N22.0 km
• NW112.4 km
• NW42.5 km
• NW73.2 km
• N103.4 km
• N203.5 km
• N114.1 km
• NW94.4 km
• N64.5 km
• NW25.0 km
• N85.4 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids