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C+History
History · Ketchum

Ketchum’s post office opened in 1880, and 4 of its places are on the National Register

More historic than 38% of U.S. towns · #32 of 59 in Idaho. What drives it

Most of Ketchum was built recently: 0.9% of its homes predate 1940 and the median home dates from 1982. 4 places in town are on the National Register, among them a historic district with 7 buildings. Below: 3 old photos and papers, maps from 1885 on, and the census since 1890.

1880first post office
4on the National Register
0.9%homes built before 1940
3old photos & papers
1famous people
Add an old photoShare a memory
From Ketchum’s archive · credits on each photo
Quick answers

How Ketchum began

When was Ketchum founded?

1880

The Ketchum post office opened in 1880, the earliest record of the town by name.

First census: 450 in 18902020 census: 3,555146 years

How historic is Ketchum?

C+

More historic than 38% of U.S. towns, on its age, its old homes and the National Register.

What drives the grade ↓
Founding year: the first Ketchum post office (Blevins & Helbock, CC0).The full story ↓
History grade

What drives Ketchum’s History grade

On its age, its old homes and the National Register, Ketchum is more historic than 38% of U.S. towns, #32 of 59 in Idaho. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.

C+
HistoryA character grade: shown, never part of Ketchum’s overall grade.
Founding era1880, from the first post office: founded 1850–1899, an older era than 37% of U.S. townsC+Homes built before 19400.9% of homes (±1.5) · typical ID town 8.5% · U.S. 8.4%DNational Register4 listings, 13 historic buildings, 36.2 per 10,000 residents · typical ID town 8.4 · U.S. 2.4A−
All U.S. towns we grade (21,289)Ahead of 38%
NewerOlder
Idaho towns of 2,500+ (59)Ahead of 47%

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 Ketchum’s 36.2 sits above most of its state (81% of Idaho towns have fewer) while its 13 historic buildings outnumber those of 77% of U.S. towns.

How sure. Graded on any two of the three inputs instead, the letter would range from D to B. The pre-1940 share (±1.5 points) is firm at this size. The founding year is the first post office, not a stated founding date.

Founding year: the first post office (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 Ketchum’s past

Read from the archive, the National Register and the record. The page puts what stands out first.

A history waiting to be writtenOnly 3 old photos are in the public archives. The rest are in attics and albums.Mapped building by building4 fire insurance maps, 1885 to 1897, drew every building in Ketchum.Landmarks on the Register4 places on the National Register.
★ What stands out · Help out

Start Ketchum’s collection

The first neighbors to add old photos shape how Ketchum’s history is told.

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
2 of 10 decades. The empty ones are waiting for someone’s album.
Retake an old viewIdaho - Kellogg through: stand where they stood+15Share a family photoSign in to add one+10
Every building

Ketchum, building by building, 1885–1897

Fire insurance maps drew every building, what it was made of and what it was used for, so insurers could price the risk of fire. Pick a year, then a sheet.

Ketchum fire insurance map, 1885, sheet 11885Sheet 1 of 1
Edition
Sheets
BrickWoodStone

Sanborn Map Company, via the Library of Congress. Editions published in 1930 or earlier, which are in the public domain.

On the National Register

4 listings protect 13 historic buildings

The country’s official list of buildings and places worth saving.

places listed
4
National Historic Landmarks
0
none yet
historic buildings protected
13
each building in a district counts
first listed
1982
Bald Mountain Hot Springs
Greenhow and Rumsey Store BuildingBald Mountain Hot SpringsKetchum Ranger District Administrative Site
BuildingsDistrictsStructures

Architectural styles listings

Pegram through truss bridge1
Rustic1
Forest Service Standard Plan1
Greenhow and Rumsey Store BuildingBuilding
Cold Springs Pegram Truss Railroad BridgePegram through truss bridge
All 4 listings
Bald Mountain Hot SpringsBuilding · listed 1982Ketchum Ranger District Administrative SiteDistrict · listed 2007

National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.

The story

How Ketchum came to be

From Wikipedia’s history of Ketchum.

Read it all →

Originally the smelting center of the Warm Springs mining district, the town was first named Leadville in 1880. The postal department decided that was too common and renamed it for David Ketchum, a local trapper and guide who had staked a claim in the basin a year earlier. Smelters were built in the 1880s, with the Philadelphia Smelter, located on Warm Springs Road, processing large amounts of lead and silver for about a decade.

Text from Wikipedia, licensed CC BY-SA 4.0.

Timeline

Ketchum, 1880 to 2003

Woven from the archive, old maps, post office records, the National Register and the people born here.

  1. 19th century
  2. 1880Post officeThe Ketchum post office opens
  3. 20th century
  4. 1941In the archiveIdaho - Kellogg through
  5. 1955In the archiveGold Mine History
  6. 1967On the mapFirst mapped by the U.S. Geological Survey
  7. 21st century
  8. 2003Born hereRyder Sarchett is born here
By decade

Ketchum, decade by decade

2 decades in the archive, from the 1940s to the 1950s. Scroll each row; tap a photo for its story.

1940s–1950s3 items
Idaho - Kellogg through1941Idaho - Kellogg throughIdaho - Kellogg through1941Idaho - Kellogg throughGold Mine History1955Gold Mine History
1960s–1990snothing yet
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.
Add from your album
Today9 recent
Ketchum, Idaho-68642018Ketchum, Idaho-6864Starbucks - panoramio (4)2015Starbucks - panoramio (4)Ketchum Sun Valley in winter2015Ketchum Sun Valley in winterSawtooth National Forest Map2012Sawtooth National Forest MapMapEye of the Wood2011Eye of the Wood2011 Road Odyssey20112011 Road OdysseyHot Spring - panoramio - photophat2008Hot Spring - panoramio - photophatTumtumcar on an icy street, Ketchum Idaho January 20072007Tumtumcar on an icy street, Ketchum Idaho January 2007IDMap-doton-Ketchum2004IDMap-doton-Ketchum
On the map

Ketchum on the map in 1967

The U.S. Geological Survey’s map of Ketchum.

Ketchum on the 1967 USGS map1967Sun Valley sheet · 1:24,000

U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Ketchum.

Then & now

Stand where they stood

No then-and-now pairs yet. Take a photo from the same spot as an old one and they appear here side by side.

Idaho - Kellogg through
Retake this viewIdaho - Kellogg through, 1941

Find the spot, match the angle, and add your photo. It becomes the first then-and-now pair on Ketchum’s page.

Retake this view · +15
People over time

Ketchum, census by census

05001,0001,5002,0002,5003,0003,50019001920194019601980200020203,555

Grew from 450 people in 1890 to 3,555 in 2020, 7 times over.

9 censuses, 1890–2020.

U.S. Census Bureau decennial counts, from the census table on Ketchum’s Wikipedia page.

Stories next door

History across the town line

Each neighbor’s History grade, on the same three inputs.

Sun Valley1 historic placeD

Questions about Ketchum’s history

What year was Ketchum founded?

The Ketchum post office opened in 1880, the earliest record of the town by name (U.S. post office records).

How does Ketchum rank for history?

Ketchum is more historic than 38% of U.S. towns, #32 of 59 in Idaho. 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 Ketchum?

4 listings: 2 buildings, among them the Bald Mountain Hot Springs (listed 1982, the first), 1 historic district, the Ketchum Ranger District Administrative Site, with 7 contributing buildings, and 1 structure. 13 historic buildings in all.

How old are the homes in Ketchum?

0.9% of Ketchum’s homes were built before 1940 (Census estimate, ±1.5 points), against a typical 8.5% for an Idaho town; the median home was built in 1982.

Memory lane

What the archives can’t tell you, neighbors can.

Town Square →
Start a conversation
Sources

Where this page comes from

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 (12), the National Register of Historic Places (4), 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), the USGS Geographic Names Information System and Sanborn fire insurance maps (Library of Congress). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.