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History · Egan

Egan’s post office opened in 1880, and 47% of its homes were built before 1940

Its Register listings are the South Dakota Dept. of Trans. Br. No. 51-124-136 and the Egan Park. Its Register listings are the South Dakota Dept. of Trans. Br. No. 51-124-136 and the Egan Park.

1880first post office
2on the National Register
47%homes built before 1940
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Quick answers

How Egan began

When was Egan founded?

1880

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

2020 census: 241146 years
Founding year: the first Egan post office (Blevins & Helbock, CC0).
On the National Register

2 historic places in Egan

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

places listed
2
National Historic Landmarks
0
none yet
historic buildings protected
2
each building in a district counts
first listed
2001
South Dakota Dept. of Trans. Br. No. 51-124-136
South Dakota Dept. of Trans. Br. No. 51-124-136, built 1922Egan Park
SitesStructures

Architectural styles listings

Parker through truss1
WPA1
South Dakota Dept. of Trans. Br. No. 51-124-136Parker through truss · Built 1922
All 2 listings
Egan ParkSite · listed 2003

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.

Grovena TownshipIts storynot graded: under 1,000 residents or part of its townEgan TownshipIts storynot graded: under 1,000 residents or part of its town

Questions about Egan’s history

What year was Egan founded?

The Egan 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 Egan?

Two places: the South Dakota Dept. of Trans. Br. No. 51-124-136 (listed 2001) and the Egan Park (2003).

Memory lane

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

Town Square →
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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 National Register of Historic Places (2), 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.