History · Delmont

Delmont’s history is
mostly unwritten

The public archives hold no old photos of Delmont. The rest are in attics, shoeboxes and the historical society. Help start the collection.

0old images & papers
5historic places
5recent photos

The story so far

from Wikipedia & the U.S. Census

Delmont is a city in southeastern Douglas County, South Dakota, United States. The population was 153 at the 2020 census. Delmont was laid out in 1886. The Onion House, named for his onion shaped metallic dome and located in Delmont, is listed on the list of National Register of Historic Places since 1987. Also included on the same historic marker is Bluebird Locker, a local business in Delmont known for its “Delmont Sausage” but also serves as a butchery for other types of meats.

Between the 2010 and 2020 censuses its population fell from 234 to 153 (-35%). Half of its homes were built before 1943.

Wikipedia doesn’t have a history of Delmont yet — the old photos, dates and memories neighbors add here are how it gets written.

Intro from Wikipedia, licensed CC BY-SA 4.0. Population and housing: U.S. Census Bureau.

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Start Delmont’s collection

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

0 of 10 decades since 1900 have photos 📦Share a family photoSign in to add one+10
Famous people from DelmontWriters, athletes, leaders and more who were born in Delmont.Meet them →
By decade

Delmont, decade by decade

Before
2000
No old photos in the archives yetWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
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National Register of Historic Places

5 historic places in Delmont

5 places in Delmont are on the National Register of Historic Places, the country’s official list of buildings and places worth saving.

#31
In South Dakotaby listings · most towns there have none
5places listed5 buildings
0National Historic LandmarksNone here yet
5historic buildings protectedcounting each building in a district
1988first listedThomas Lenehan House · newest: Delmont State Bank, 2008

Where they are

Tap a dot for a photo and link. Districts show at their center.
Buildings

When they were listed

The Register began in 1966. Delmont’s busiest decade was the 1980s.
National Park Service, National Register of Historic Places (05/22/2026) · styles from the National Archives catalog · photos from Wikimedia Commons, credited on each place

Then & now

When neighbors add old photos, retakes from the same spot appear here side by side.

Stories next door

nearby towns’ history

From Wikimedia Commons (5) and the National Register (1). Images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.

We left the porch light on

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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/18 · 2025-01-01