Castor dates to 1900
Most of Castor was built recently: 0.6% of its homes predate 1940 and the median home dates from 1979.
How Castor began
When was Castor founded?
Castor dates its founding to 1900 (Wikipedia’s history). Its post office opened in 1901.
2 famous people were born in Castor
Writers, athletes, leaders and more, ranked by how widely they’re known.
Questions about Castor’s history
What year was Castor founded?
In 1900, according to Wikipedia’s history of the town. Castor’s post office opened in 1901.
Memory lane
What the archives can’t tell you, neighbors can.
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 Wikidata and Wikipedia for famous people, 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.