| Language of origin | Tsimshianic language family Nisg̲a’a language |
| Feature Type: | Post Office - A Canada Post designation; the post office name may or may not be the same as the name of the place where it is located. |
| Status: | Official |
| Name Authority: | BC Geographical Names Office |
| Relative Location: | In New Aiyansh (community), just SE of junction of Ksi Sii Aks (Tseax River) and Nass River, Cassiar Land District |
| Latitude-Longitude: | 55°12'14"N, 129°04'51"W at the approximate population centre of this feature. |
| Datum: | WGS84 |
| NTS Map: | 103P/3 |
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Origin Notes and History:
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New Aiyansh (settlement) adopted 4 April 1974 on 103P/3. Subsequently the Aiyansh Post Office was moved to this location. Confirmed as New Aiyansh (Community) - Aiyansh (Post Office) 26 October 1988 on 103P/3. Dual name dismantled July 1995 by Ottawa. Aiyansh (Post Office) and New Aiyansh (community) are at the same location; BOTH to be labelled on BC maps. Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office |
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Upper Nass Post Office opened 1 August 1912; renamed Aiyansh Post Office 1 January 1916. After a disastrous fire in the early 1980's, the Aiyansh Post Office, businesses and houses were re-established at the community of New Aiyansh, about 3 miles to the southwest. Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office |