What does a DH99 postcode tell you?

That the address lies in the DH99 district of the DH (Durham) postcode area, and the place OS Open Names most often lists first for its postcodes is Durham. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 3 live postcodes.

DH99 postcode district

DH99, in the DH (Durham) postcode area, has 3 live and 28 terminated postcodes in the ONS Postcode Directory of August 2026, and OS Open Names files 1 road under it.

postcode area	DH (Durham)
live postcodes	3
terminated postcodes	28
sectors	1
roads listed	1
centroid	54.78824, -1.54938
directory release	2026-08

Postcodes and sectors

3 of the district's 31 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 54.78824, -1.54938, which locates the district, not a building.

sector	live	terminated
DH99 1	3	28

Places OS Open Names lists for DH99

Durham
County Durham
North East

Roads filed under DH99

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.

Framwelgate Waterside

Check an address in DH99

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=DH99" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about DH99

What does a DH99 postcode tell you?: That the address lies in the DH99 district of the DH (Durham) postcode area, and the place OS Open Names most often lists first for its postcodes is Durham. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 3 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 DH99

DH11.2 km
DH66.8 km
DH57.2 km
DH77.5 km
DH48.2 km
DH28.6 km
DH39.5 km
DL1610.6 km
NE3811.8 km
TS2912.0 km
DL1712.0 km
SR712.8 km
Every district
How a British address is written
Check any address

distance between the districts' centroids

Wrong result, or is it about you? If this tool said something you think is wrong, tell us and a person reads it. If Spaw is holding data about you and you never signed up here — a customer may have had your address verified, or reported that a message to it bounced — erase it yourself, confirmed by mail to that address and with no account needed.

More free tools

All free tools

Need this at scale?

The Spaw API runs the same check with batch and bulk endpoints, monitored address lists, your own suppression list and outcome reporting — 100 free credits a month, no card required.

Get your API key