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History · Iroquois

Iroquois’ post office opened in 1880, and 29% of its homes were built before 1940

Its Register listing is the Bank of the Iroquois Building. Below: 1 old photo or paper, maps from 1893 on, and the census since 1890.

1880first post office
1on the National Register
29%homes built before 1940
1old photo or paper
From Iroquois’ archive · credits on each photo
Quick answers

How Iroquois began

When was Iroquois founded?

1880

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

First census: 181 in 18902020 census: 292146 years
Founding year: the first Iroquois post office (Blevins & Helbock, CC0).The full story ↓

What stands out about Iroquois’ past

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

★ What stands out · Help out

Start Iroquois’s collection

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

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
1 of 10 decades. The empty ones are waiting for someone’s album.
On the map

Iroquois on the map, 1899 to 1985

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

Iroquois on the 1899 USGS mapIroquois on the 1971 USGS mapIroquois on the 1985 USGS map1899De Smet sheet · 1:125,000

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

People over time

Iroquois, census by census

01002003004005006007001900192019401960198020002020Peak: 651

Peaked at 651 in 1920; 292 people lived here in 2020.

14 censuses, 1890–2020.

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

The story

How Iroquois came to be

From Wikipedia’s history of Iroquois.

Read it all →

Iroquois was laid out in 1880. The city was named after the Haudenosaunee (Iroquois) people. A post office called Iroquois has been in operation since 1880.

Text from Wikipedia, licensed CC BY-SA 4.0.

Timeline

Iroquois, 1880 to 1920

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

  1. 19th century
  2. 1880Post officeThe Iroquois post office opens
  3. 1887BuiltBank of the Iroquois Building is built
  4. 1899On the mapFirst mapped by the U.S. Geological Survey
  5. 20th century
  6. 1912In the archiveIroquois, S.D
  7. 1920CensusPopulation peaks at 651
By decade

Iroquois, decade by decade

One decade in the archive so far: the 1910s. Scroll each row; tap a photo for its story.

1920s–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
Every building

Iroquois, building by building, 1893–1911

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.

Iroquois fire insurance map, 1893, sheet 11893Sheet 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.

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.

Iroquois, S.D
Retake this viewIroquois, S.D, 1912

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

Retake this view · +15
On the National Register

1 historic place in Iroquois

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

place listed
1
National Historic Landmarks
0
none yet
historic buildings protected
1
each building in a district counts
first listed
2002
Bank of the Iroquois Building
Buildings

Architectural styles listings

Late Victorian1
Italianate1
All 1 listings

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

Stories next door

History across the town line

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

Questions about Iroquois’ history

What year was Iroquois founded?

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

What is on the National Register in Iroquois?

One place: the Bank of the Iroquois Building (listed 2002).

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 Wikimedia Commons (2), the National Register of Historic Places (1), Wikipedia, 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.