Founding year: Wikidata. First post office: 1828.The full story ↓
History grade
What drives Adamstown’s History grade
On its age, its old homes and the National Register, Adamstown is more historic than 40% of U.S. towns. Its age holds the grade up; its National Register listings pull it down.
C+
HistoryA character grade: shown, never part of Adamstown’s overall grade.
Few Maryland towns list much on the Register (a typical Maryland town has 0.9 per 10,000 residents, the U.S. 2.4), so Adamstown’s 0.0 sits below most of its state (20% of Maryland towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from C− to B−. The pre-1940 share is a Census survey estimate (±4.4 points). Two sources give 1840.
Founding year: Wikidata (other dates in Quick answers). Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →
What stands out about Adamstown’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Adamstown lies in the fertile valley between Sugarloaf and Catoctin Mountain on the former Carrollton Manor, a 17,000-acre (69 km2) estate originally owned by Charles Carroll of Carrollton. Until 2000, it was a little-altered representative of mid-19th century linear town planning. It is significant in architecture for its variety of structures, including residential, commercial, industrial, educational, agricultural, and religious buildings. The late 18th century road from Jefferson to Greenfield Mills on the Monocacy River, originally called the Bridal Road, followed the route of the present-day Mountville Road. The 1832 arrival of the railroad to the manor created the economic and transportation impetus for the development of the community.
In 1840, according to Wikidata. Adamstown’s post office opened in 1828.
How does Adamstown rank for history?
Adamstown is more historic than 40% of U.S. towns. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.
How old are the homes in Adamstown?
6% of Adamstown’s homes were built before 1940 (Census estimate, ±4.4 points), against a typical 3.3% for a Maryland town; the median home was built in 2003.
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).
From Wikimedia Commons (6), Wikipedia, 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.
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