NN3 postcode district

Postcodes and sectors

1,315 of the district's 2,645 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 52.26406, -0.84226, which locates the district, not a building.

Companies registered in NN3

Companies House lists 4,644 companies with a registered office in NN3; 306 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 NN3

• East Midlands
• West Northamptonshire
• Northampton
• Moulton
• North Northamptonshire

Roads filed under NN3

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.

• Abington Park Crescent
• Addison Road
• Aintree Road
• Alder Court
• Alexander Court
• Alibone Close
• Allard Close
• Almond Grove
• Alvis Court
• Alwyn Walk
• Ambleside Close
• Anglia Way
• Annesley Close
• Appleby Walk
• Arbour Court
• Arbour View Court
• Arbour Walk
• Arlbury Road
• Arnsby Crescent
• Ashby Court
• Ashby Gardens
• Ashcroft Gardens
• Ashford Close
• Ashley Close
• Ashley Lane
• Ashley Way
• Ashmead
• Aspen Close
• Aspinal Road
• Aster Close
• Attlee Close
• Azalea Close
• Baldwin Close
• Baldwin Court
• Barbers Close
• Barley Hill Road
• Barlow Lane
• Barnhill Square
• Barnstaple Close
• Baukewell Court
• Baunhill Close
• Beaumont Drive
• Becket Way
• Beech Avenue
• Beechcroft Gardens
• Beech Grove
• Beechwood Drive
• Beeston Avenue
• Belfield Close
• Bellropes Square
• Belstead Road
• Bentley Close
• Berrydale
• Bestwell Court
• Beverley Crescent
• Bewick Road
• Bibury Crescent
• Bideford Close
• Billing Brook Road
• Billing Lane

Check an address in NN3

Check an address in NN3

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=NN3" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about NN3

What does an NN3 postcode tell you?

That the address lies in the NN3 district of the NN (Northampton) postcode area, and the place OS Open Names most often lists first for its postcodes is Northampton. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 1,315 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 NN3

• NN23.3 km
• NN14.0 km
• NN56.8 km
• NN46.8 km
• NN78.6 km
• NN69.6 km
• NN810.7 km
• NN2912.1 km
• MK4615.3 km
• NN1516.3 km
• NN1017.0 km
• NN1618.1 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids