Ascension Island Postal Codes

Ascension Island has a single postal code covering the whole territory: ASCN 1ZZ.

It was allocated under the United Kingdom's postcode system. Every address there takes the same code.

How an address is written in Ascension Island

This is the order Ascension Island's postal service expects. Square brackets mark what you replace.

[Recipient name]
[Street address]
[City]
[Postal code (STHL 1ZZ)]
ASCENSION ISLAND

Sources and licensing

Postal code data from GeoNames, used under the Creative Commons Attribution 4.0 International licence. Address formats and validation rules derive from Google's international address metadata, cross-checked against Universal Postal Union addressing standards. Last verified August 2026. Confirm time-critical addresses with the destination country's postal operator.