Firth, Idaho
city in Bingham County, Idaho, United States
Firth is a town in Bingham County, Idaho, United States. The population was 517 at the 2020 census.
Geography
According to the United States Census Bureau, the town has a total area of 0.54 square miles (1.40 km2), all of it land.
Firth is located on the eastern side of the Snake River, facing the Blackfoot Mountains.
History
Firth began as a Swedish settlement in 1885. It was named for Lorenzo J. Firth, an English emigrant, who gave land for the railroad section house and water tank; the railroad named the station for him in 1903. The post office was established in 1905. The town hosts Firth cemetery (known as Dye cemetery before 1935).
Demographics
2010 census
At the 2010 census, there were 477 people in 168 households, including 121 families, in the town. The population density was 883.3 inhabitants per square mile (341.0/km2).
“Firth, Idaho” enters the record as city in Bingham County, Idaho, United States. Crown Archives preserves that source wording while asking what Firth, Idaho and city can confirm, complicate or overturn.
Why this record matters
“Firth, Idaho” is worth following because a concise public description often conceals a longer documentary argument. Here, Firth, Idaho and city provides the most credible route into that argument.
Place names and jurisdictional language are key evidence: both can reveal earlier catalogue descriptions and overlooked record series. The source revision retrieved here is dated May 14, 2026. The linked authority identifier is Q931132. VIAF identifies the subject as 139826831. The Library of Congress control number is no00064889. Authority coordinates are 43.306, -112.184. 2 of 3 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 2020, 1885, 1903 and 1905.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Firth, Idaho”, its source revision and the description used here.
- Expand the search: follow Firth, Idaho primary sources, Firth, Idaho archive and Firth research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Firth, Idaho”?
- What physical evidence or contemporary plan supports the description?
- Which earlier names or jurisdictions may reveal additional records?
Search terms from this dossier
This entry incorporates text from “Firth, Idaho” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.