What does an S49 postcode tell you?

That the address lies in the S49 district of the S (Sheffield) postcode area, and the place OS Open Names most often lists first for its postcodes is Chesterfield. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 8 live postcodes.

S49 postcode district

S49, in the S (Sheffield) postcode area, has 8 live and 21 terminated postcodes in the ONS Postcode Directory of August 2026, and OS Open Names files 1 road under it.

postcode area	S (Sheffield)
live postcodes	8
terminated postcodes	21
sectors	1
roads listed	1
companies registered	16
centroid	53.23532, -1.43432
directory release	2026-08

Postcodes and sectors

8 of the district's 29 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 53.23532, -1.43432, which locates the district, not a building.

sector	live	terminated
S49 1	8	21

Companies registered in S49

Companies House lists 16 companies with a registered office in S49 (1 October 2026 snapshot).

Places OS Open Names lists for S49

Chesterfield
Derbyshire
East Midlands

Roads filed under S49

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.

Future Walk

Check an address in S49

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=S49" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about S49

What does an S49 postcode tell you?: That the address lies in the S49 district of the S (Sheffield) postcode area, and the place OS Open Names most often lists first for its postcodes is Chesterfield. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 8 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 S49

S400.8 km
S411.4 km
S424.2 km
S437.2 km
S187.6 km
S457.8 km
S448.1 km
S2110.6 km
S1711.4 km
S812.0 km
S2012.3 km
S1412.3 km
Every district
How a British address is written
Check any address

distance between the districts' centroids

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