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History · Egan Township

19% of Egan Township’s homes were built before 1940

Below: maps from 1963 on and the census since 1880.

0on the National Register
19%homes built before 1940
Add an old photoShare a memory
Photo: TheCatalyst31 · CC BY 4.0

What stands out about Egan Township’s past

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

A history waiting to be writtenNo old photos of Egan Township are in the public archives yet. The rest are in attics and albums.Boom and bustPeaked at 569 in 1920; 241 people lived here in 2020.Lost villages2 post offices opened and closed inside today’s Egan Township, and 2 old place names are still on the map.
★ What stands out · Help out

Start Egan Township’s collection

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

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
0 of 10 decades. The empty ones are waiting for someone’s album.
Share a family photoSign in to add one+10
People over time

Egan Township, census by census

010020030040050060018801900192019401960198020002020Peak: 569

Peaked at 569 in 1920; 241 people lived here in 2020.

15 censuses, 1880–2020.

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

Places that used to be

Lost post offices, old corners and places now gone

Two other post offices opened and closed inside today’s town.

Hillsdale
1874–1884
Lone Tree
1879–1880
18701950today
Hamlets and corners on the map
Lone TreeSioux Falls Junction
Gone or out of use
Hillsdalelocale

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

The story so far

Egan Township, in brief

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

Egan is a city in Moody County, South Dakota, United States. The population was 241 at the 2020 census. The city has the name of a railroad employee.

Between the 2010 and 2020 censuses its population grew from 201 to 216 (+7%).

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

Timeline

Egan Township, 1874 to 1963

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

  1. 19th century
  2. 1874Post officeThe Hillsdale post office opens
  3. 1879Post officeThe Lone Tree post office opens
  4. 1880Post officeThe Lone Tree post office closes
  5. 1884Post officeThe Hillsdale post office closes
  6. 20th century
  7. 1920CensusPopulation peaks at 569
  8. 1963On the mapFirst mapped by the U.S. Geological Survey
By decade

Egan Township, decade by decade

Today4 recent
Second Street Bridge2024Second Street BridgeEgan Park2024Egan ParkColman-Egan School2024Colman-Egan SchoolSDMap-doton-Egan2004SDMap-doton-Egan
On the map

Egan Township on the map, 1963 to 1980

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

Egan Township on the 1963 USGS mapEgan Township on the 1980 USGS map1963Trent 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 Egan Township.

Famous people

Famous people close to Egan Township

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

See all →
Gene AmdahlAmerican physicist · b. 1922
I
Ivan DresserAmerican long-distance runner · b. 1896
Edith GreenAmerican politician · b. 1910
Dell L. DaileyFormer head of the State Department's counterte… · b. 1949
D
Daniel AhlersAmerican businessman and politician · b. 1973
D
Dan SuttonAmerican politician · b. 1970
Stories next door

History across the town line

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

Enterprise Township1 historic placenot graded: under 1,000 residents or part of its townGrovena TownshipIts storynot graded: under 1,000 residents or part of its townClare TownshipIts storynot graded: under 1,000 residents or part of its townColman TownshipIts storynot graded: under 1,000 residents or part of its townEgan2 historic placesnot graded: under 1,000 residents or part of its town

Questions about Egan Township’s history

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 (4), Wikidata (1), 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.