Its Register listing is the Proctor Mountain Ski Lift. Most of Sun Valley was built recently: 1% of its homes predate 1940 and the median home dates from 1979. Below: 8 old photos and papers, maps from 1967 on, and the census since 1950.
Founding year: Wikidata. First post office: 1937.The full story ↓
History grade
What drives Sun Valley’s History grade
On its age, its old homes and the National Register, Sun Valley is more historic than 15% of U.S. towns. Its National Register listings hold the grade up; its age pulls it down.
D
HistoryA character grade: shown, never part of Sun Valley’s overall grade.
Idaho towns list more on the Register than most of the country (a typical Idaho town has 8.4 per 10,000 residents, the U.S. 2.4), so Sun Valley’s 6.8 sits near the middle of its state (53% of Idaho towns have fewer) while its 1 listings outnumber those of 51% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from D to C−. The pre-1940 share (±1.3 points) is firm at this size. Two sources give 1936.
Founding year: Wikidata (other dates in Quick answers). Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →
What stands out about Sun Valley’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
The first destination winter resort in the U.S. was developed by W. Averell Harriman, the chairman of the Union Pacific Railroad, primarily to increase ridership on U.P. passenger trains in the Western United States. The UP's City of Portland (from Chicago and Omaha) and Portland Rose (from Kansas City) went to Shoshone in southern Idaho, where buses (then called "motor coaches") took travelers to Sun Valley. Sleeping car passengers from Los Angeles were able to take direct carriages on the UP's Pony Express from Los Angeles to Salt Lake City, and the Sun Valley Special from Salt Lake City to Sun Valley.
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
In 1936, according to Wikidata. Sun Valley’s post office opened in 1937, and the census of 1950 counted 428 people here.
How does Sun Valley rank for history?
Sun Valley is more historic than 15% of U.S. towns. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.
What is on the National Register in Sun Valley?
One place: the Proctor Mountain Ski Lift (listed 1980).
How old are the homes in Sun Valley?
1% of Sun Valley’s homes were built before 1940 (Census estimate, ±1.3 points), against a typical 8.5% for an Idaho town; the median home was built in 1979.
Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021).
From Wikimedia Commons (9), the Library of Congress (3), the National Register of Historic Places (1), Wikipedia, Wikidata and Wikipedia for famous people, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
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1941
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