Altmar dates to 1813, and 47% of its homes were built before 1940
How Altmar began
When was Altmar founded?
Altmar dates its founding to 1813 (Wikidata). Its post office opened in 1825.
Questions about Altmar’s history
What year was Altmar founded?
In 1813, according to Wikidata. Altmar’s post office opened in 1825.
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 →