Potomac’s post office opened in 1884, and 1 of its places is on the National Register
Its Register listing is the Potomac School.
How Potomac began
When was Potomac founded?
The Potomac post office opened in 1884, the earliest record of the town by name.
1 historic place in Potomac
The country’s official list of buildings and places worth saving.
Architectural styles listings
All 1 listings
National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.
Lost post offices and places now gone
Potomac had its own post office from 1884 to 1976.
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
Questions about Potomac’s history
What year was Potomac founded?
The Potomac post office opened in 1884, the earliest record of the town by name (U.S. post office records).
What is on the National Register in Potomac?
One place: the Potomac School (listed 1992).
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 (1), 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.