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Dr. Elmer Bly HouseDr. Elmer Bly House · Photo: John Branson, Historian for Lake Clark NPP · Public domain
–Not graded
History · Port Alsworth

Port Alsworth’s post office opened in 1950, and 3 of its places are on the National Register

Most of Port Alsworth was built recently: 4% of its homes predate 1940 and the median home dates from 1991. Its Register listings are the Dr. Elmer Bly House, the Wassillie Trefon Dena'ina Fish Cache and the LIBBY'S NO. 23 (bristol bay double ender). Its Register listings are the Dr. Elmer Bly House, the Wassillie Trefon Dena'ina Fish Cache and the LIBBY'S NO. 23 (bristol bay double ender).

1950first post office
3on the National Register
4%homes built before 1940
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Quick answers

How Port Alsworth began

When was Port Alsworth founded?

1950

The Port Alsworth post office opened in 1950, the earliest record of the town by name.

2020 census: 18676 years
Founding year: the first Port Alsworth post office (Blevins & Helbock, CC0).
On the National Register

3 historic places in Port Alsworth

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

places listed
3
National Historic Landmarks
0
none yet
historic buildings protected
3
each building in a district counts
first listed
2006
Dr. Elmer Bly House
Dr. Elmer Bly HouseWassillie Trefon Dena'ina Fish Cache, built 1920LIBBY'S NO. 23 (bristol bay double ender), built 1914
BuildingsStructures
Dr. Elmer Bly HouseBuilding
Wassillie Trefon Dena'ina Fish CacheBuilt 1920
LIBBY'S NO. 23 (bristol bay double ender)Built 1914

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

Questions about Port Alsworth’s history

What year was Port Alsworth founded?

The Port Alsworth post office opened in 1950, the earliest record of the town by name (U.S. post office records).

What is on the National Register in Port Alsworth?

Three places: the Dr. Elmer Bly House (listed 2006), the Wassillie Trefon Dena'ina Fish Cache (2013) and the LIBBY'S NO. 23 (bristol bay double ender) (2013).

Memory lane

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

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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 (3), 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.