Callaghan’s post office opened in 1804, and 30% of its homes were built before 1940
2 places in town are on the National Register, among them the Humpback Bridge, a National Historic Landmark.
How Callaghan began
When was Callaghan founded?
The Callaghan post office opened in 1804, the earliest record of the town by name.
2 historic places in Callaghan
The country’s official list of buildings and places worth saving. One is a National Historic Landmark, the highest tier.
Architectural styles listings
★ Landmark
National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.
Lost post offices and old corners
Callaghan had its own post office from 1804 to 1919.
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
Questions about Callaghan’s history
What year was Callaghan founded?
The Callaghan post office opened in 1804, the earliest record of the town by name (U.S. post office records).
What is on the National Register in Callaghan?
Two places: the Humpback Bridge (listed 1969) and the Wood Hall (1982).
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 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.