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History · Sedan

Sedan’s post office opened in 1891, and 1 of its places is on the National Register

Most of Sedan was built recently: 2% of its homes predate 1940 and the median home dates from 1982. Its Register listing is the Sedan School. Below: 12 old photos and papers and maps from 1951 on.

1891first post office
1on the National Register
2%homes built before 1940
12old photos & papers
Add an old photoShare a memory
From Sedan’s archive · credits on each photo
Quick answers

How Sedan began

When was Sedan founded?

1891

The Sedan post office opened in 1891, the earliest record of the town by name.

2020 census: 101135 years
Founding year: the first Sedan post office (Blevins & Helbock, CC0).

What stands out about Sedan’s past

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

Mystery photos12 old photos have no date. Neighbors can guess the decade.A town in old photos12 old photos, postcards and papers.
★ What stands out · Help out

Start Sedan’s collection

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

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
0 of 10 decades. The empty ones are waiting for someone’s album.
Date a photo12 archive items have no date. Guess the decade.+2Retake an old viewWoosley Place, 25 Sedan Road: stand where they stood+15Share a family photoSign in to add one+10
By decade

Sedan, decade by decade

Date unknown12 to date
Woosley Place, 25 Sedan RoadDate?Woosley Place, 25 Sedan RoadSedan Schoolhouse, 26600 Bridger Canyon RoadDate?Sedan Schoolhouse, 26600 Bridger Canyon RoadLandis House, 10 Sedan RoadDate?Landis House, 10 Sedan RoadWoosley Place, Log House, 25 Sedan RoadDate?Woosley Place, Log House, 25 Sedan RoadWoosley Place, Cribbed Machine Shop, 25 Sedan RoadDate?Woosley Place, Cribbed Machine Shop, 25 Sedan RoadThompson Place, 25 Flathead Creek RoadDate?Thompson Place, 25 Flathead Creek RoadAlbert Stevens Homestead, 901 West Flathead Creek RoadDate?Albert Stevens Homestead, 901 West Flathead Creek RoadThompson Place, Creek Lodge, 25 Flathead Creek RoadDate?Thompson Place, Creek Lodge, 25 Flathead Creek RoadThompson Place, Outer Barn, 25 Flathead Creek RoadDate?Thompson Place, Outer Barn, 25 Flathead Creek RoadThompson Place, Four-Square House, 25 Flathead Creek RoadDate?Thompson Place, Four-Square House, 25 Flathead Creek …Albert Stevens Homestead, Gambrel Dairy Barn, 901 West Flathead Creek RoadDate?Albert Stevens Homestead, Gambrel Dairy Barn, 901 Wes…Albert Stevens Homestead, 1-1/2 Story Log Dwelling, 901 West Flathead Creek RoadDate?Albert Stevens Homestead, 1-1/2 Story Log Dwelling, 9…
The story so far

Sedan, in brief

Wikipedia doesn’t have a history of Sedan yet. The photos, dates and memories neighbors add here are how it gets written.

Sedan is a census-designated place (CDP) in Gallatin County, Montana, United States. As of the 2020 census, Sedan had a population of 101. It is located on Montana Highway 86, 27 miles from Bozeman. The Zip Code is 59086.

Its first post office opened in 1891. Between the 2010 and 2020 censuses its population grew from 99 to 101 (+2%).

Intro from Wikipedia. Population: U.S. Census Bureau.

Timeline

Sedan, 1891 to 1951

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

  1. 19th century
  2. 1891Post officeThe Sedan post office opens
  3. 20th century
  4. 1915Post officeThe Sedan post office closes
  5. 1951On the mapFirst mapped by the U.S. Geological Survey
On the map

Sedan on the map, 1951 to 2000

Every edition of the U.S. Geological Survey’s map of Sedan. Tap a year, or press play to watch the town change.

Sedan on the 1951 USGS mapSedan on the 1987 USGS mapSedan on the 2000 USGS map1951Sedan sheet · 1:62,500

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

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.

Woosley Place, 25 Sedan Road
Retake this viewWoosley Place, 25 Sedan Road

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

Retake this view · +15
On the National Register

1 historic place in Sedan

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

place listed
1
National Historic Landmarks
0
none yet
historic buildings protected
2
each building in a district counts
first listed
1981
Sedan School
Sedan School
Buildings
All 1 listings
Sedan SchoolBuilding · listed 1981

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

Famous people

Famous people close to Sedan

Nobody well known was born in Sedan itself, so here are the best known from just nearby.

See all →
Ryan Zinke52nd United States Secretary of the Interior an… · b. 1961
Brannon BragaTelevision producer · b. 1965
P
Philip WinchesterAmerican stage actor, television actor and film… · b. 1981
P
Pete LovelyRacecar driver · b. 1926
Dale W. JorgensonAmerican economist · b. 1933
Peter VoulkosAmerican artist · b. 1924
Places that used to be

Lost post offices, places now gone and burying grounds

Sedan had its own post office from 1891 to 1915.

Sedan
1891–1915
18901960today
Gone or out of use
East Flathead SchoolschoolSedan Post Officepost officeSedan Schoolschool
1cemetery inside Sedan
Sedan

US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).

Questions about Sedan’s history

What year was Sedan founded?

The Sedan post office opened in 1891, the earliest record of the town by name (U.S. post office records).

What is on the National Register in Sedan?

One place: the Sedan School (listed 1981).

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). How TownRatings grades history →

From the Library of Congress (12), the National Register of Historic Places (1), U.S. Geological Survey historical maps, 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.