What does a CH99 postcode tell you?

That the address lies in the CH99 district of the CH (Chester) postcode area, and the place OS Open Names most often lists first for its postcodes is Chester. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 17 live postcodes.

CH99 postcode district

CH99, in the CH (Chester) postcode area, has 17 live and 33 terminated postcodes in the ONS Postcode Directory of August 2026, and OS Open Names files no road under it.

postcode area	CH (Chester)
live postcodes	17
terminated postcodes	33
sectors	3
roads listed	0
companies registered	2
centroid	53.17513, -2.89547
directory release	2026-08

Postcodes and sectors

17 of the district's 50 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 53.17513, -2.89547, which locates the district, not a building.

sector	live	terminated
CH99 1	0	16
CH99 3	0	6
CH99 9	17	11

Companies registered in CH99

Companies House lists 2 companies with a registered office in CH99 (1 October 2026 snapshot).

Places OS Open Names lists for CH99

Chester
Cheshire West and Chester
North West

Roads filed under CH99

OS Open Names files no road under CH99, so a street here cannot be confirmed from the register and the lookup answers about the postcode alone.

Check an address in CH99

Common questions about CH99

What does a CH99 postcode tell you?: That the address lies in the CH99 district of the CH (Chester) postcode area, and the place OS Open Names most often lists first for its postcodes is Chester. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 17 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 CH99

CH882.6 km
CH702.7 km
CH13.2 km
CH43.6 km
CH25.1 km
CH35.2 km
CH510.2 km
CH6511.4 km
LL1211.5 km
CH6611.7 km
CW615.3 km
LL1115.6 km
Every district
How a British address is written
Check any address

distance between the districts' centroids

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