S21 postcode district

Postcodes and sectors

467 of the district's 525 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 53.31221, -1.33896, which locates the district, not a building.

Companies registered in S21

Companies House lists 1,057 companies with a registered office in S21; 206 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 S21

• Derbyshire
• East Midlands
• North East Derbyshire
• Killamarsh
• Eckington
• Renishaw
• Marsh Lane
• Bolsover
• Spinkhill
• Middle Handley
• Chesterfield
• Nether Handley
• Greenside
• West Handley

Roads filed under S21

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.

• Abbey Croft
• Abbey Place
• Acacia Crescent
• Acer Close
• Aintree Avenue
• Albert Street
• Aldred Close
• Almond Drive
• Ash Close
• Ash Crescent
• Ashland Road
• Ash Lane
• Ashleigh Court
• Ashley Close
• Ashley Lane
• Ash Mews
• Ashmore Avenue
• Ashton Close
• Aspen Close
• Aspen Road
• Atkinson Mews
• Back Lane
• Bailey Drive
• Baker Drive
• Barber's Lane
• Barn Road
• Barratt Road
• Bay Court
• Bedgrave Close
• Beech Crescent
• Belklane Drive
• Berrisford Avenue
• Berry Avenue
• Betony Close
• Billam Street
• Birch Close
• Birchlands Drive
• Birchwood Road
• Boiley Lane
• Bolehill Lane
• Bramley Mews
• Bramleymoor Lane
• Bramley Road
• Bramley View
• Breck Lane
• Briars Close
• Bridge Street
• Bridle Lane
• Brindley Court
• Brook Street
• Broomhall Court
• Broomhill Close
• Bryony Close
• Bunkers Hill
• Butler Way
• Cage Drive
• Camms Close
• Campion Drive
• Canal Bridge
• Canalside

Check an address in S21

Check an address in S21

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=S21" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about S21

What does an S21 postcode tell you?

That the address lies in the S21 district of the S (Sheffield) postcode area, and the place OS Open Names most often lists first for its postcodes is Killamarsh. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 467 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 S21

• S202.6 km
• S435.0 km
• S265.5 km
• S126.0 km
• S136.5 km
• S147.9 km
• S189.1 km
• S419.3 km
• S29.6 km
• S89.7 km
• S449.8 km
• S2510.1 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids