DN21 postcode district

Postcodes and sectors

1,371 of the district's 1,685 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 53.41918, -0.70370, which locates the district, not a building.

Companies registered in DN21

Companies House lists 2,199 companies with a registered office in DN21; 145 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 DN21

• East Midlands
• West Lindsey
• Lincolnshire
• Gainsborough
• North Lincolnshire
• Yorkshire and the Humber
• Kirton in Lindsey
• Scotter
• Blyton
• Lea
• Waddingham
• Marton
• Hemswell Cliff
• Upton
• Willingham by Stow
• Scotton
• Redbourne
• Glentworth
• Corringham
• Snitterby
• Willoughton
• Fillingham
• Kexby
• Hemswell

Roads filed under DN21

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.

• Acacia Avenue
• Acland Street
• Adams Way
• Adelaide Close
• Adlington Mews
• Aegir Close
• Aisby Walk
• Albany Street
• Albert Close
• Albert Terrace
• Alderton Chase
• Alec Rose Grove
• Alfie Williams Way
• Alfred Street
• Althing Place
• Anastasia Close
• Anderson Road
• Anderson Way
• Apley Close
• Arkwright Street
• Arrandale
• Arthur Road
• Arundel Close
• Ashcroft Road
• Ash Grove
• Aspen Court
• Asquith Street
• Astley Crescent
• Atterby Carr Lane
• Austin Drive
• Avenue A
• Avenue B
• Back Street
• Bacon Street
• Bader Way
• Baines Road
• Balfour Street
• Barley Close
• Barlings Close
• Barnard Meadows
• Barnes Green
• Barton Road
• Bayard Street
• Beaufort Street
• Beaumont Street
• Beckett Avenue
• Beck Lane
• Becks Lane
• Beech Avenue
• Beechcroft Drive
• Beechwood Drive
• Beggar's Lane
• Bellbutts View
• Belvoir Close
• Bettesworth Road
• Betty's Lane
• Bircham Crescent
• Birch Grove
• Birchwood View
• Birkdale Square

Check an address in DN21

Check an address in DN21

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=DN21" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about DN21

What does a DN21 postcode tell you?

That the address lies in the DN21 district of the DN (Doncaster) postcode area, and the place OS Open Names most often lists first for its postcodes is Gainsborough. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 1,371 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 DN21

• DN1015.2 km
• DN915.9 km
• DN1617.0 km
• DN1717.1 km
• DN2218.3 km
• LN119.0 km
• DN2020.2 km
• DN1522.0 km
• LN222.3 km
• LN725.1 km
• DN1125.2 km
• LN625.4 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids