BT1 9YH is a large user postcode in Northern Ireland. It was first introduced in May 2017.
'Large User' postcodes are allocated to organisations which receive large amounts of post. Unlike standard geographic postcodes, which cover up to 80 addresses, a large user postcode is unique to a single address.
The geographic coordinates assigned to a large user postcode may not necessarily be the actual coordinates of the location to which mail is delivered. If the address is a PO Box, then the coordinates will usually be the Royal Mail sorting office which handles mail for that postcode. In other cases, the coordinates of the postcode may be the headquarters, or registered office, of an organisation rather than the building which receives mail.
This is a non-geographic postcode, which has no assigned geographical coordinates and therefore no nearby postcodes.
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